Why does my high compression engine keep jumping cam time from kickstarting?

[one_civic]

Personally I would just get a manual tensioner or fabricate your own like I did, could be a combination of a slightly stretched chain along with a sticking / faulty tensioner.
Here are some pic's of the one my machinist and I made.

 

[one_civic]

You didn't mention if your using the stocked degree'd cam's or aftermarket higher lift ones with stiffer springs

 

[Buffalo Bill]

GregT are you endurance racing 8, 12 or 24 hours?

 

[Brendan W]

Are you kicking on Prime ? What are the chances you are filling combustion chambers with fuel and locking up ?

 

[trippivot]

Nice piece you have there - very functional.

personally i would just get a manual tensioner or fabricate your own like i did, could be a combination of a slightly stretched chain along with a sticking / faulty tensioner.
Here are some pic's of the one my machinist and i made.

 

[GregT]

GregT are you endurance racing 8, 12 or 24 hours?

Short sprint races - 20 minutes max. But the camchain guides and tensioner blade get checked every teardown. If there were harmonics present it would show up pretty quickly at those revs, The camchain gets replaced now every two seasons racing...even though it's still within spec. DID heavy duty for those interested.

 

[Chuck78]

Pulled tensioner knurled nut off today as I felt the tension was inadequate, wound it 1.5 turns tighter preload, feels much better now.

Stock GS750 cams. Resurfaced head and cylinder block, thought I should degree the cams on engine rebuild, but didn't yet. I notice my arrows don't quite line up as they show in the manual, I suspect due to the resurfacing milling job I had done on both.

I thought I had a stripped thread on the tensioner spring winding shaft, felt as hard to loosen as tightening. It turns out I must've used some serious threebond semi-permanent hitemp thread locker on it as I recalled after the fact. I got it for internal engine parts. Hope I am able to get those apart again if I ever need to! That stuff was seriously stout...

I noticed the gs550's tensioner felt slightly firmer on the spring than mine was, but also noticed binding stiction on the wedged part. I recall reading bwringer's tutorial saying that often the wedge angled ends get worn down unevenly and need a light sanding or filing to clean up.

Should be checking valve clearances and firing it up tomorrow! My excuse to ride Saturday is so that I can get parts for the wife's bike at the vintage Japanese salvage shop... 66 degree Ohio winter day, can't wait!