These motors will drop in psi too when warmed up. So in short what Ibedayank is saying I feel and concur is about right . For a good cold reading. As in if you warm up a engine that had a cold reading that is too low well..
Well, this is the first time I've ever tested the compression on a cg. I don't really know if there's anyting wrong with it or not.I take it you where having problems with this motor?
On all the motors I have tested under 100psi it was rebuild time.
last motor was a 100cc hodaka dualsport it tested 105 psi and the boss says... rebuild it
It's not leaking from the intake, exhaust, or head gasket.Might wanna think about a air leak?
I have my doubts about any seals leaking because there's no oil coming out.I know if you work on something enough you will eventually break it LOL If it's workin I don't fix it generally especially with a disposable HT engine.
well some carb spray would show any intake leaks cigarette smoke would show anything blowin out I would think only other leak I could imagine would be a hole in the piston head not sure how to check that one.
I looked closer for a leak, and found the intake manifold leaking. I installed a new gasket, and now the idle seems consistant again.pull the head look and see what the inside of the cylinder looks like...
only gasket that matters for compression is the head gasket.
prolly safe to say that topend has had it
What gives you the idea it's hard starting? It's actually pretty easy starting. Like I said, I never use the choke. When warm it starts first pop.with compression that low its going to have a had time sucking the fuel through, hence the hard starting. a trick i use on outboards is to put a little oil in the cylinder before you start it. If it starts right up you know its rooted.
make sure the O-ring on your gauge is properly seated. do you have any other motors to test the gauge on?
I guess the only thing I could say is the bottom end, and midrange is gutless, but that's the same impression I had 2 years ago lol.I am speaking generally as you stated, one symptom of low compression is hard starting.
And that's exactly what I've been doing, but it's days are short, because I have 2 new Flying Horse 80 motors on the shelf. They're calling to me lol. I don't know how much longer I can resist.sounds like you should just run it into the ground my friend.
ignorance is bliss.
What are you saying George? That I might improve my compression and then I wouldn't have an excuse to install my new Flying Horse motor? Damnit man, it's wore out lol.Because Motorkote bonds to the metal I put a capfull in a tank of fuel and check compression after spent. The stuff is $25 a quart off Amazon shipped to your door and treats 2 cars. Probably $5 worth would lube every chain and cable as well as the engine on a MB...I mix a little with my grease as well. The stuff works your engine will be quieter. I saw my turbo's temp go down using this stuff on a '98 Peterbuilt (they have a pyrometer). I wouldn't use it till the engine is broke in but I'd say yours is past the break-in LOL