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Re: A65 porting and throttle response video. [Re: Mark Parker] #698782
06/17/17 8:18 am
06/17/17 8:18 am
Joined: Apr 2005
Posts: 2,383
Bega NSW Australia
Mark Parker Offline OP
BritBike Forum member
Mark Parker  Offline OP
BritBike Forum member
Joined: Apr 2005
Posts: 2,383
Bega NSW Australia
John, the fully threaded studs are cut off head bolts from I think a Mitsubishi. They are 10mm with the section threaded into the block reduced to 9mm. They are only done up to 29-30ftlb in this and seem to be working very well. There is no smoke so they don't seem to be distorting the oversize bores. (Why I'd originally used 8mm). It's the best it's ever run with the head freshened up as well.


mark
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Re: A65 porting and throttle response video. [Re: Mark Parker] #698798
06/17/17 1:11 pm
06/17/17 1:11 pm
Joined: Aug 2001
Posts: 3,919
argyll. scotland, uk
gavin eisler Offline
BritBike Forum member
gavin eisler  Offline
BritBike Forum member
Joined: Aug 2001
Posts: 3,919
argyll. scotland, uk
Hi Mark, my big bore uses 3/8ths fasteners, John usually uses stepped fasteners, but my barrels slipped through the net, I uses a head gasket that had the fasteners thread tapped into the fasteners holes, after stripping I noted that the Cu had extruded up to help seal, theres not much meat for the gasket at the centre rear mount, havent had any oil burning issues , and no leaks , using similar torque values, 30 ft lb.

When I was looking into head bolt stuff I read an interesting write up on wasted studs in V Dub air cooled motors, all thread pretty much has the same effect allowing a more even stretch along the fastener, on the V dubs this helped to prevent thread tear out, compared with the solid shanked bolts which tend to stretch more at the threads causing them to strip out.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: A65 porting and throttle response video. [Re: Mark Parker] #703420
07/31/17 7:56 am
07/31/17 7:56 am
Joined: Apr 2005
Posts: 2,383
Bega NSW Australia
Mark Parker Offline OP
BritBike Forum member
Mark Parker  Offline OP
BritBike Forum member
Joined: Apr 2005
Posts: 2,383
Bega NSW Australia
This is from the weekend. With a Gopro aimed out the back. This is with a new stainless 2" X connector and rear pipes. This has the join a bit better so its better flowing internally.

https://www.youtube.com/watch?v=a_FSM22SokU&feature=youtu.be


mark
Re: A65 porting and throttle response video. [Re: Mark Parker] #710050
09/30/17 12:39 pm
09/30/17 12:39 pm
Joined: Apr 2005
Posts: 2,383
Bega NSW Australia
Mark Parker Offline OP
BritBike Forum member
Mark Parker  Offline OP
BritBike Forum member
Joined: Apr 2005
Posts: 2,383
Bega NSW Australia
I found out why the thing was hard to start today. I kicked it about 50+ times to get it started put it up the driveway, put gear on tried a few time to kick start it, then pushed it down the road and bump started it but it only ran on one cyl, great, went back home to see why. No spark on R/H cyl, trigger coil was open circuit.

Took it off put on a different type from the shed, a cheap Chinese one. Not exactly sure where that put the timing but it must be close because the idle is about the same, and seems to go the same or better, except almost every time I started it after that it was on the first kick. Once it was on the second. This trigger has a lot more magmatism. Anyway I should be able to buy fuel now without having to push start the thing, and right foot boot life will be greatly extended.


mark
Re: A65 porting and throttle response video. [Re: Mark Parker] #717491
12/02/17 8:18 pm
12/02/17 8:18 pm
Joined: Oct 2006
Posts: 2,674
Elburn, Ill. USA
I
Irish Swede Offline
BritBike Forum member
Irish Swede  Offline
BritBike Forum member
I
Joined: Oct 2006
Posts: 2,674
Elburn, Ill. USA
Too bad that "Photobucket" stole all the images within this excellent article.

Page 15 of 15 1 2 13 14 15

Moderated by  Allan Gill 


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