ATC 200x Rebuild Compression

[Honda200x.]

I just rebuilt my 85 200x, its bored .50 over with the matching piston for the bore, all new gaskets, I had a valve job done (with new valves installed) the rings are installed correctly, valves are adjusted, timing correct, everything checks out, accept I think i'm running a tiny bit lean. It starts first kick runs amazing in every way, it seems very powerful and everything(accept I haven't really opened it up at all)I did a cold compression test and its 120 psi and then I did a warm compression test and its still 120 psi I didn't do anything performance to the motor so I don't know if this is a fine reading and I didn't do a test before I started running it so I don't know if its gone up at all. I have only been running it(slow break in) for probably an hour and twenty minutes total. So my question is, does this reading sound normal?

[Honda200x.]

Anyone? is this an ok reading?

[Jason125m]

That sounds low. Its supposed to have around 164 psi.

[4cylinders]

hey, how are you doing your compression test?

[jb2wheels]

Does it need more break in time?

If it runs fine and does not smoke, move on and ride!

[Jason125m]

Usually only need 30 minutes of runtime for an accurate reading.

[WilliamJ]

Did you do the test with the throttle fully open?
Did you do a wet test as well? Test dry then put a small squirt of oil in the plug hole which helps to seal the rings if they are faulty and the pressure jumps up. If the valves or head gasket are leaky the oil makes no difference.

If the rings are not sealing it could be that the honing was not sufficient but it could also be faulty rings or rings upside down or wrong size.

It isn’t unusual for the test gauges to read wrong so check it against another machine in good condition.
Bill

[1984 honda 200s]

Jesus, i was getting that on my stock oil burning 200s..... After .20 over wiseco raised it right up and it snaps back and nearley impossible to pull it over in -10 weather !
unsure of the comp.

[Honda200x.]

well that doesn't make me feel to good i have a harbor freight cheep compression tester and could it be that my cam is timed wrong and it's not letting enough air into the chamber to compress? my timing on my am to the rocker cover doesn't line up perfectly but its pretty close should i try one tooth over either way and see if it jumps up, also i had the valve seats cut and new valves put in professionally from g&h discount atv, they did the bore and hone too.

[Honda200x.]

And when I run I don't leak any oil out of any gaskets and yes i'm doing the test at wide open throttle, and no it doesn't smoke at all.

[1984 honda 200s]

What are your valves set at? i would check that first to make sure your clearence is correct.

[Honda200x.]

when i did the rebuild i set em to the correct clearance but would that make a 40 psi difference?

[1984 honda 200s]

I would think so, when i did my rebuild i set them wrong, they were at 0.008... made a hell of a tick... so i checked the manual again and its supposed to be at 0.002
The 200x is supposed to be .003 for both exhaust and intake..

[Honda200x.]

ok ill check it does tick a lot how tight should it be on the feeler gauge

[1984 honda 200s]

They both should have Slight resistance on the guage at .003