Best way to loose comperssion? 064

[Al Smith]

Well if you've got 20 thou without a gasket then with a stock gasket it would be around 40 thou .At the same time it would raise the ex port a couple degrees and if anything it should run faster .I doubt it would affect the grunt enough to even tell a difference .

If it does though snag a cover from National Geographic or some other magazine that uses that type cover and make a gasket .I think that one is around 12 thou thick,thinner than a stock Stihl gasket .I've had to make a few gaskets myself because I sometimes miss measure when I cut a cylinder base,it happens .

 

[Terry Syd]

Can a 064 use the 066 coil with the 4 degree retard on starting?

Hell, I've got one of those coils on my 64cc 029 AND a de-comp. Just pull and go...

 

[Al Smith]

Something else,a hunch perhaps .If the starter drum hole is worn to some ovality it will cause the drum to run out eccentric and really bind it up .I had this happen on a 2100 Husky and had to turn a brass bushing for the starter drum .Which corrected the problem .For that matter a drum wound too tight will bind too .You only want about one rope turn tighter than full retraction on the drum .

 

[BuckthornBonnie]

Can a 064 use the 066 coil with the 4 degree retard on starting?

Hell, I've got one of those coils on my 64cc 029 AND a de-comp. Just pull and go...

Depends on the case/flywheel combo. Some cases dont accept the universal coils. Both of mine (plus a 3rd in parts) require either the dogleg coil, the 046 coil, or the aftermarket dogleg... haven't tried am yet, tho.

 

[Wood Doctor]

Mike makes a good point, the 064 coil will not fire till it gets to a really high rpm, i can't remember off the top of my head but north of 12,000 i am pretty sure, many other models do not have this type of cut in especially at such a high rpm.

Seems hard to believe. I can't imagine that you can ever pull the cord that fast. My 064 will fire at 4500 RPM, which is where I have the fast idle set. It starts.

 

[Outback]

+1 for timing, have you checked your flywheel hasn't slipped?

My 064 didn't yank the rope out of my hand until I put a decomp 660 jug on it. Ported/advanced 372's occasionaly pull the rope out of my hand if i'm not fast on the pull. Even if the timing is "right" maybe you need to run less for your arms sake. If the rope keeps yanking back its too much timing.

 

[Flying_Dutchman]

Seems hard to believe. I can't imagine that you can ever pull the cord that fast. My 064 will fire at 4500 RPM, which is where I have the fast idle set. It starts.

I think he meant 1200. It has to spark when you pull the cord, or it wouldn't start.