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#691276 - 04/11/17 4:50 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: Mar 2005
Posts: 9,854
John Healy Online content
John Healy  Online Content


Joined: Mar 2005
Posts: 9,854
Boston, Massachusetts
HB PM me and I will see what we can sort out for you!
John


#691333 - 04/12/17 12:39 am Re: mail-order LSR [Re: Hillbilly bike]  
Joined: Dec 2013
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kevin roberts Online content
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kevin roberts  Online Content

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Posts: 2,993
ohio, usa
Originally Posted by Hillbilly bike
I don't have any spare engines


kill switches, toggles, an extra control cable, weird pre-unit special tools, gaskets, special oil, inner tubes, master links, whatever wears out in a harley starter, just the cheapie stuff.

a genuine blow-up is terminal, but i had to leave wilmington this spring after one completed run on my machine because i didn't have a spare magneto rotor-- a twenty-dollar part.


Into the distance a ribbon of black
Stretched to the point of no turning back
A flight of fancy on a windswept field
Standing alone my senses reeled
A fatal attraction is holding me fast how
How can I escape this irresistible grasp?
#691390 - 04/12/17 10:16 am Re: mail-order LSR [Re: kevin roberts]  
Joined: Oct 2012
Posts: 2,936
Hillbilly bike Online content
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Hillbilly bike  Online Content
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Running from demons in WNY
Originally Posted by kevin roberts
Originally Posted by Hillbilly bike
I don't have any spare engines


kill switches, toggles, an extra control cable, weird pre-unit special tools, gaskets, special oil, inner tubes, master links, whatever wears out in a harley starter, just the cheapie stuff.

a genuine blow-up is terminal, but i had to leave wilmington this spring after one completed run on my machine because i didn't have a spare magneto rotor-- a twenty-dollar part.



That's a long list....All I ever took to any of the 4 races including Maine was safety wire, electrical tape, spark plugs, spare battery and jets...Actually I did think of a spare starter motor..

The Canadian vendor British Cycle Supply has a US warehouse just a few miles from Loring. They said the phones will be manned during the race days to assist any racers......


Naked frame LSR bikes, dressed in animal hides clinging to vibrating oily machines propelled by fire
#691403 - 04/12/17 12:31 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: Oct 2009
Posts: 405
pushrod tom Offline
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pushrod tom  Offline
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new jersey usa
Actually, BCS is located on the base. Nice to know. Usually we are to busy to drop by and say hi.

#691468 - 04/12/17 8:41 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: Mar 2011
Posts: 62
linker48x Offline
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linker48x  Offline
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Joined: Mar 2011
Posts: 62
Alaska
Just to complete something I mentioned above--Here's a couple pics of the short pipes Jack Wilson told me to use about 25 years ago, one sitting still, one in motion and leaned over.

[Linked Image]

[Linked Image]

These short pipes were used by a lot of AHRMA Triumph racers back in the 90's. (Nowadays there aren't very many Triumphs out in AHRMA F750 and Sportsman 750, but folks use an array of 2 into 1's, longer single pipes, etc.) Note that the factory TT pipes are 43 inch around the outside of the bends. These are standard TT pipes cut off at the end of the bend, 29 inch head pipes,with a 14 inch megaphone on them, 43 inches total, same length as the original TT pipes. The megaphone is 13 inch to 3 1/2 dia, then a 1 inch reverse cone to 2 1/2 inches. Although the original TT pipes give a nice power band, these with the megaphones are too short, too pipey, I think, for my meager talents on a road race course--at full throttle they stumble up to 4500 or so and then begin to really pull strongly at 5000, and the engine spins up to 7500 or so very quickly, and it has above 50 ft-lbs torque from 5000-7200. In the pics above, you can see the up pipes I made to replace these identical but are a bit longer, 32 inch head pipes, and something I think really helped, a 2 1/2 inch muffler core 4 inches long, held in a 3 1/2 inch straight section with a flat end and packing--I think this eased the flow at the back and helped kill the megaphonitis at lower rpm. Now this is a sort of tractor, power starts at or just below 4000, and pulls up to 7000, with just a little trailing off as you get there. This works for road racing much better, but not so sure you guys running flat out would agree that you need such a broad spread of power. I am curious how the original 43 inch set would work for you guys, for straightaway running. Pretty easy for you to try, and switch out.

By the way, I don't remember the measurements he told me, but John Healy's bike uses much longer pipes, he told me he thinks these are too short.

#691491 - 04/12/17 11:17 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: Dec 2013
Posts: 2,993
kevin roberts Online content
BritBike Forum member
kevin roberts  Online Content

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Joined: Dec 2013
Posts: 2,993
ohio, usa
i can try that. i already have enough stuff to make up something similar.

who knows?


Into the distance a ribbon of black
Stretched to the point of no turning back
A flight of fancy on a windswept field
Standing alone my senses reeled
A fatal attraction is holding me fast how
How can I escape this irresistible grasp?
#691516 - 04/13/17 2:34 am Re: mail-order LSR [Re: kevin roberts]  
Joined: Mar 2011
Posts: 62
linker48x Offline
BritBike Forum member
linker48x  Offline
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Posts: 62
Alaska
I think I have two pairs, one in California with the bike, one here, set up to mount with springs over 1 3/4 spigots. Back mounts for a Champion frame but modifiable.

#691517 - 04/13/17 2:34 am Re: mail-order LSR [Re: kevin roberts]  
Joined: Mar 2011
Posts: 62
linker48x Offline
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linker48x  Offline
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Posts: 62
Alaska
I think I have two pairs, one in California with the bike, one here, set up to mount with springs over 1 3/4 spigots. Back mounts for a Champion frame but modifiable.

#691984 - 04/16/17 11:19 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: Dec 2013
Posts: 2,993
kevin roberts Online content
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kevin roberts  Online Content

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Posts: 2,993
ohio, usa
almost ready for july!

[Linked Image]

[Linked Image]


Into the distance a ribbon of black
Stretched to the point of no turning back
A flight of fancy on a windswept field
Standing alone my senses reeled
A fatal attraction is holding me fast how
How can I escape this irresistible grasp?
#692402 - 04/19/17 10:40 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: Dec 2013
Posts: 2,993
kevin roberts Online content
BritBike Forum member
kevin roberts  Online Content

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Joined: Dec 2013
Posts: 2,993
ohio, usa
finally found the source for the 5/16-24 pre-drilled jam nuts for triumph conical and disc front fork caps. these are a real PITA to drill out for safety wire, and there 4 of the buggers on each leg.

http://aircraftproducts.wicksaircraft.com/viewitems/aircraft-nuts/drilled-jam-nut

[Linked Image]

sorry out of stock on the right ones at the moment, but i bought a handful here before.

lots of other interesting stuff. they even have a motorcycle/aviation oil and grease section that would be great to look through for the next motor oil debate here.


Into the distance a ribbon of black
Stretched to the point of no turning back
A flight of fancy on a windswept field
Standing alone my senses reeled
A fatal attraction is holding me fast how
How can I escape this irresistible grasp?
#692476 - 04/20/17 1:05 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: Oct 2009
Posts: 405
pushrod tom Offline
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pushrod tom  Offline
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new jersey usa
Kevin, You are a master of suspense!! We want to hear how it runs! PRT

#692480 - 04/20/17 1:16 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: Dec 2013
Posts: 2,993
kevin roberts Online content
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kevin roberts  Online Content

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ohio, usa
lol

me too, tom.

i still work 12 or 16 hours per day, so i can only hit this puppy on weekends. i need to clay the pistons and build pipes. then i'm ready to dyno it.

brand new stinking V-rated tires arrived yesterday. my H rated tires were still brand new, too, but you made them illegal with your hornet.

dont need any more parts. just more time.


Into the distance a ribbon of black
Stretched to the point of no turning back
A flight of fancy on a windswept field
Standing alone my senses reeled
A fatal attraction is holding me fast how
How can I escape this irresistible grasp?
#693537 - 04/30/17 11:05 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: Dec 2013
Posts: 2,993
kevin roberts Online content
BritBike Forum member
kevin roberts  Online Content

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Joined: Dec 2013
Posts: 2,993
ohio, usa
clayed the new rob hall head. couldn't find the clay i used last time, so i tried playdough instead. no go, the stuff is springy and expands back after you squeeze it. gave that to the kids and finally found some oil-based modeling clay.

no problems at all with the domes. didn't think there would be, but checked anyway:

[Linked Image]

lots of clearance on the exhaust side:

[Linked Image]

left exhaust about 0.120

[Linked Image]

right exhaust at 0.100

[Linked Image]

left intake at 0.065

[Linked Image]

right intake also at 0.065

[Linked Image]

i'm using a copper base gasket and copper rocker box gaskets too, each at 0.021 inches. i could tighten up the clearances by leaving the rocker box gaskets off, and i may do that. have to think a bit. i may do a repeat tomorrow to check the right intake valve to valve pocket clearances, as they seem a bit tight with these oversize valves. worked okay with the others, but i've changed things.


Into the distance a ribbon of black
Stretched to the point of no turning back
A flight of fancy on a windswept field
Standing alone my senses reeled
A fatal attraction is holding me fast how
How can I escape this irresistible grasp?
#693580 - 05/01/17 10:52 am Re: mail-order LSR [Re: kevin roberts]  
Joined: Jan 2006
Posts: 1,808
Mike Baker Offline
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Mike Baker  Offline
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Joined: Jan 2006
Posts: 1,808
Asheville, NC
I've been told that .060" is a good place to be for valve/ piston interface.
Have you checked for cam/ flywheel clearance? Again I've been told to have at least .060.

#693593 - 05/01/17 12:59 pm Re: mail-order LSR [Re: Mike Baker]  
Joined: Oct 2012
Posts: 2,936
Hillbilly bike Online content
BritBike Forum member
Hillbilly bike  Online Content
BritBike Forum member

Joined: Oct 2012
Posts: 2,936
Running from demons in WNY
.060 on valves has worked for me even when the rider overran the cams. Cam to flywheel on my bikes is about 45 to 50 thousands


Naked frame LSR bikes, dressed in animal hides clinging to vibrating oily machines propelled by fire
#693600 - 05/01/17 1:49 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: Dec 2013
Posts: 2,993
kevin roberts Online content
BritBike Forum member
kevin roberts  Online Content

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Joined: Dec 2013
Posts: 2,993
ohio, usa
cam to flywheel in this setup was so great i didnt even measure it. about an eighth of an inch. the billet crank flywheel is much smaller than stock.

ran fine to 8000 rpm several times last summer .not on purpose, though.


Into the distance a ribbon of black
Stretched to the point of no turning back
A flight of fancy on a windswept field
Standing alone my senses reeled
A fatal attraction is holding me fast how
How can I escape this irresistible grasp?
#693604 - 05/01/17 2:11 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: Nov 2011
Posts: 150
koncretekid Online content
BritBike Forum member
koncretekid  Online Content
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Joined: Nov 2011
Posts: 150
Nova Scotia, Canada
Don't forget to clay the squish band area around the edge. You can probably get away with .035".
[Linked Image]
Tom


Life's uncertain - go fast now!
#693620 - 05/01/17 4:45 pm Re: mail-order LSR [Re: koncretekid]  
Joined: Oct 2012
Posts: 2,936
Hillbilly bike Online content
BritBike Forum member
Hillbilly bike  Online Content
BritBike Forum member

Joined: Oct 2012
Posts: 2,936
Running from demons in WNY
My 650 Triumph modified production bike quench looks like this with MAP 10.5 pistons...Between .039 .032 depending on where it's measured...The dual engine Triumph is a bit tighter. I don't use cylinder base gaskets..........

[Linked Image]


Naked frame LSR bikes, dressed in animal hides clinging to vibrating oily machines propelled by fire
#693628 - 05/01/17 5:59 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: Dec 2013
Posts: 2,993
kevin roberts Online content
BritBike Forum member
kevin roberts  Online Content

BritBike Forum member

Joined: Dec 2013
Posts: 2,993
ohio, usa
i have a clearance issue with tbe tappet blocks. i need to measure that again tonight. easy to do.

i raised them up a bit with valve spring shims, plus the tappet blocks i used have deeper recesses for tbe tappet foot. the base gasket helps by 0.021, but i'd like to delete it.


Into the distance a ribbon of black
Stretched to the point of no turning back
A flight of fancy on a windswept field
Standing alone my senses reeled
A fatal attraction is holding me fast how
How can I escape this irresistible grasp?
#693680 - 05/01/17 11:15 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: Dec 2013
Posts: 2,993
kevin roberts Online content
BritBike Forum member
kevin roberts  Online Content

BritBike Forum member

Joined: Dec 2013
Posts: 2,993
ohio, usa
got home and found these in the mailbox from dave madigan

[Linked Image]

[Linked Image]

T120 adjustable pushrod tubes. beautifully made. have everything i need now to put the motor back together.


Into the distance a ribbon of black
Stretched to the point of no turning back
A flight of fancy on a windswept field
Standing alone my senses reeled
A fatal attraction is holding me fast how
How can I escape this irresistible grasp?
#693721 - 05/02/17 10:35 am Re: mail-order LSR [Re: kevin roberts]  
Joined: Aug 2001
Posts: 356
konon Online content
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konon  Online Content

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Posts: 356
Iowa
Nice ! They should make things easier.


1968 BSA Firebird
1200 HD
XS 1100
1971 Rickman 125
#694116 - 05/06/17 2:52 am Re: mail-order LSR [Re: kevin roberts]  
Joined: Dec 2013
Posts: 2,993
kevin roberts Online content
BritBike Forum member
kevin roberts  Online Content

BritBike Forum member

Joined: Dec 2013
Posts: 2,993
ohio, usa
got my exhaust system from cone engineering:

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

well, it needs a bit of work, but it's all there. 1 5/8 stainless main tubes, mild steel 1 3/4 for the initial exhaust tubes, because they have 1.65-inches ID to fit over the exhaust stubs. close enough in diameter for me to weld them together.

i'll be duplicating the stock two-into-two system, mostly, except it will extend farther from the head to clear the ARD magneto, and drop farther below the frame to clear the rearsets.

actual length to be determined next month, for the july meet. then whether or not to use megaphones for september.


Into the distance a ribbon of black
Stretched to the point of no turning back
A flight of fancy on a windswept field
Standing alone my senses reeled
A fatal attraction is holding me fast how
How can I escape this irresistible grasp?
#694129 - 05/06/17 7:07 am Re: mail-order LSR [Re: kevin roberts]  
Joined: May 2013
Posts: 4,494
Allan Gill Offline
Allan Gill  Offline



Joined: May 2013
Posts: 4,494
Rotherham - S. Yorkshire
Your going to have a pipe going horizontally?

I'll see if I have any photos of what we used to make when I used to make exhausts


beerchug
#694164 - 05/06/17 4:03 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: Dec 2013
Posts: 2,993
kevin roberts Online content
BritBike Forum member
kevin roberts  Online Content

BritBike Forum member

Joined: Dec 2013
Posts: 2,993
ohio, usa
the stock and aftermarket pipes begin a radiused turn right after the exhaust stubs on the head. since the ARD sticks forward, and the mag rotates out another 5 degrees for timing, it interferes with the right pipe. you can either bend the right pipe to the left, like the old alphabet 2-into-1:

[Linked Image]

or you can extend the stubs out from the head an inch or so. the stock radius on the upper exhaust bend is about 3.75 inches, and the pipe people only had tighter bends in 2.5 inches, so this is the solution to the clearance problem.

there was an interesting TR6 at wilmington last time that used a 2-into-1 to go 116:

[Linked Image]

we didn't have a lot of time to compare notes, but his system looked like a standard TT version with a collector at the end.

[Linked Image]
[Linked Image]


Into the distance a ribbon of black
Stretched to the point of no turning back
A flight of fancy on a windswept field
Standing alone my senses reeled
A fatal attraction is holding me fast how
How can I escape this irresistible grasp?
#694177 - 05/06/17 7:40 pm Re: mail-order LSR [Re: kevin roberts]  
Joined: May 2013
Posts: 4,494
Allan Gill Offline
Allan Gill  Offline



Joined: May 2013
Posts: 4,494
Rotherham - S. Yorkshire
Would a set of TT pipes not clear the mag?

I looked for a photo of the balance piece but unfortunately I don't have one.

We used to have 2 sections of pipe each one we bent at 3 points, like a chicane in its shape, then cut an elipse out of the belly portion on both then weld together, you get a very smooth X flow and it works well, you can adjust the exit of the X to suit if you have silencers or want to run straight pipes under the motor.


beerchug
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