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Re: trackbike [Re: kevin roberts] #721619
01/10/18 11:57 am
01/10/18 11:57 am
Joined: Oct 2012
Posts: 4,321
Running from demons in WNY
Hillbilly bike Online content
BritBike Forum member
Hillbilly bike  Online Content
BritBike Forum member

Joined: Oct 2012
Posts: 4,321
Running from demons in WNY
I set it back to 37 degrees based on the assumption the MAP piston design gives a faster burn rate and previously it was over advanced .....You know, the combustion must be complete by 16 degrees ATDC for best power..The best the 32MM Amals ran was 120 mph with a stock head..I never jetted them on the dyno..I believe the #280 main jets were too rich....After I had the head massaged by Rob Hall and he recommended the Mikuni 34MM TM's, the bike went on the dyno for about two hours where only the jetting was changed...A total of 8 runs...Then the bike ran 125 at Ohio, 127 in Maine and with a few inches chopped off the exhaust pipes three inches, changed cam timing and different gearing and fuel tank ran 133 at Maine..no other tuning was done,


I take off bike parts until it doesn't function, then put on just enough so it functions
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Re: trackbike [Re: kevin roberts] #721623
01/10/18 1:15 pm
01/10/18 1:15 pm
Joined: Dec 2013
Posts: 4,754
ohio, usa
kevin roberts Online content OP

DOPE
kevin roberts  Online Content OP

DOPE

Joined: Dec 2013
Posts: 4,754
ohio, usa
you know, i did fifty airstrip runs picking needle jets, needles, main jets, and ignition timing on my morgo to get 117 mph.

which gods do you sacrifice to?


every day you do not take a chance is a day of your life that you will never get back.
Re: trackbike [Re: kevin roberts] #721625
01/10/18 1:36 pm
01/10/18 1:36 pm
Joined: Oct 2012
Posts: 4,321
Running from demons in WNY
Hillbilly bike Online content
BritBike Forum member
Hillbilly bike  Online Content
BritBike Forum member

Joined: Oct 2012
Posts: 4,321
Running from demons in WNY
Originally Posted by kevin roberts
you know, i did fifty airstrip runs picking needle jets, needles, main jets, and ignition timing on my morgo to get 117 mph.

which gods do you sacrifice to?


LOL...Superflow Dyno god...........The Mikuni 34MM flat slides come with #280 mains I believe.....I asked here if anyone had jetting clues...Pushrod Tom said TM's on his BSA use 210-240 jets depending on conditions...I showed up at the dyno with 210-250 main jets....the first run with the stock jetting was far too rich but none of that "8 stroking" guys often mention...I looked at the dyno operator and said " how about 220's ?. (he has years of experience running bikes and sleds on his dyno.) Ran the bike with 220's... power dropped slightly with 210's or 230's.....Ohio and the first trip to Maine was 220's..I changed the jets to 230's for the "worlds fastest 650 Triumph stock frame" at Maine last year before the racing figuring the loading at higher speeds might be better with a slightly richer mixture....
I also believe the guy who rides my bike is one of the best LSR riders out there...At 133 mph he's posting like a race horse jockey (full weight on his legs ,his ass slightly lifted off the seat) to get his back in the best profile for least air drag...


I take off bike parts until it doesn't function, then put on just enough so it functions
Re: trackbike [Re: kevin roberts] #721626
01/10/18 1:55 pm
01/10/18 1:55 pm
Joined: Dec 2013
Posts: 4,754
ohio, usa
kevin roberts Online content OP

DOPE
kevin roberts  Online Content OP

DOPE

Joined: Dec 2013
Posts: 4,754
ohio, usa
i refuse to believe that your bike is fast because of your rider. that's just got to be b ullshit. he can't be that good.

can he?

but this whole butt-up-in-the-air thing is weird, anyway. the bonneville people swear by it, but they can't agree whether it's because of the slipstream closure past the rider's ass or whether it's because of the air running between his legs. and who can afford a wind tunnel to find out? youtube has almost nothing useful with wind tunnel stuff.

but i'm reinforcing the footpegs on my machine anyway so i won't be afraid to stand up and fart my way through the lights, too.


every day you do not take a chance is a day of your life that you will never get back.
Re: trackbike [Re: kevin roberts] #721635
01/10/18 5:03 pm
01/10/18 5:03 pm
Joined: Oct 2012
Posts: 4,321
Running from demons in WNY
Hillbilly bike Online content
BritBike Forum member
Hillbilly bike  Online Content
BritBike Forum member

Joined: Oct 2012
Posts: 4,321
Running from demons in WNY
I have to give him some credit.....There's no way an engine built by a retired electrician who hand cut piston valve reliefs while the piston was still in the engine and honed the cylinders holding them between my legs using a hand held drill could make enough power.........Right? wink


I take off bike parts until it doesn't function, then put on just enough so it functions
Re: trackbike [Re: Hillbilly bike] #721656
01/10/18 9:14 pm
01/10/18 9:14 pm
Joined: May 2013
Posts: 5,287
West Yorkshire
Allan Gill Offline

BritBike Forum member
Allan Gill  Offline

BritBike Forum member

Joined: May 2013
Posts: 5,287
West Yorkshire
Originally Posted by Hillbilly bike
I have to give him some credit.....There's no way an engine built by a retired electrician who hand cut piston valve reliefs while the piston was still in the engine and honed the cylinders holding them between my legs using a hand held drill could make enough power.........Right? wink


Burt Munro didn’t have those luxuries haha


beerchug
Re: trackbike [Re: kevin roberts] #764993
02/09/19 9:49 pm
02/09/19 9:49 pm
Joined: Dec 2013
Posts: 4,754
ohio, usa
kevin roberts Online content OP

DOPE
kevin roberts  Online Content OP

DOPE

Joined: Dec 2013
Posts: 4,754
ohio, usa
lift is empty so the trackbike stuff is getting laid out, looking for what i don't have. forks first:

[Linked Image]

i looked and looked, and said, what did i do with the shuttle valve restrictors? looked all over the shop, couldn't find them. so i ordered new ones, bolts too. one of these days i'll clean up and assemble a whole nother motorcycle from all the stuff i've lost in here.

the rest of the machine is mostly there:

[Linked Image]

don't think i need anything structural. just steering stem and wheel bearings, i think. cables too, unless i have some kicking around with the shuttle valve restrictors.


every day you do not take a chance is a day of your life that you will never get back.
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Moderated by  Allan Gill 

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