Too Much Compression

[Kayno]

Hi guys, I have a Honda GX270 and I've recently replaced the piston and rings. Now that everything is back together it is REALLY hard to start because there is so much compression. When I try to pull the rope the handle is ripped out my hand. Is this normal for a fresh piston and rings?
Thanks

 

[minibikefreak]

Stock piston and rings???

 

[novanick63]

Tighten up ur side case cover evenly if u dont it can tighten down crooked an put lots of pressure on ur cam making realyy hard to turn over makes u thunk its commpresson but its just the side case tightend down un evenly give it a try

 

[novaracer]

recheck your valve lash on the exhaust side. if it is too loose it will do that :thumbsup:

 

[Kayno]

Thanks for the replies. Well the piston and rings are stock, the side cover is tightened nice and even. I'm leaning towards it being the exhaust valve clearance. What is the stock spec?

 

[novanick63]

usually .002 intake .003 exh.

 

[useng1]

Is your timing too advanced?

 

[minidragbike]

Yeah sounds like it could be a timing problem to me. Check it out

 

[korndog]

recheck your valve lash on the exhaust side. if it is too loose it will do that :thumbsup:

Curious: I assume you are referring to the easy start failing with too much lash. About what clearance does that occur?

 

[125ccCrazy]

is it hard to turn over slow by hand like by grabbing the flywheel? or just when you pull it over fast??

 

[waynelass]

sounds like timing is out

 

[novaracer]

Curious: I assume you are referring to the easy start failing with too much lash. About what clearance does that occur?

yes as far as how it has to be off i have no idea but the more the wear on the easy spin the less it takes. the easy way to tell is if it is hard to pull only when the switch is on then it is timing i would guess. if it was me i would pull the valve cover and relash it then pull the fw just to make sure if i didnt find it in the valve cover. :thumbsup:

 

[joebiodiesel]

If you think it's timing, remove the plug wire, or have someone hold the kill switch while you pull it. If it spins over normally, it's timing.
If you think it's compression, including the exhaust valve being too tight, remove the spark plug and pull it over. If it's compression, then engine will spin freely with the plug out.

Joe

 

[aleccolin]

pop out the spark plug and make sure it's compression that's your problem

edit: dammit Joe... lol

 

[Kayno]

Adjusted the exhaust valve today and now it pulls and starts easy. Turns out there was too much clearance. Thanks guys

 

[novaracer]

your welcom clad we could help:thumbsup:

 

[korndog]

your welcom clad we could help:thumbsup:

Good call on the ez spin nova.