So my adapter for the 12mm fitting finally showed up today and did a comp test and the cylinders are 90/100/120/90. Is that ok? seems like quite a range.

 

It does. How many times did you check each? I usually do a couple tries at each, just to make sure. What's it supposed to be? Mine is 178 psi, but it's a 929...

 

Only ran it once per cylinder. I've never had one fluctuate that i can remember but this is the first time I've worked on a bike engine so I'm clueless.

 

To do it properly, the bike should be warmed up to operating temp.
That allows the rings to expand and give the proper seal on the jugs.
Yeah, kinda sucks anytime you work around a hot engine, but it will
give you the most reliable reading.

Your compression sounds low, by the way.
You don't say what year, so it's hard to say for sure.
According to this link on the 09, compression is 12.31.

2009 Honda CBR 1000RR Engine Specifications - Used 2009 CBR 1000 RR Engine Specs at Motorcyclist Magazine

That figures out to be 172 psi at 14 psi atmospheric (12.31 x 14).
*14 psi is a general, ballpark figure at sealevel*

More important than compression, is leak-down. That will let you know
what shape your rings and valve-seats are in. It tells how well, the engine will
hold that compression.

Here's an interesting article on the overall, theory/procedures for these tests...

WC Engineering : Compression and Leak Down Testing

Hope this helps, Ern

 

Yeah, the bike has not been run in 3 months. I'll check out those links. It's an 88 1000f.

 

OK so, I should get a leak down tester (rent from autozone) and run the engine to operating temps and how do i find TDC for each of the cylinders on this engine?

 

The 88 cbr 1000 runs 10.5 which factors out to 147-ish psi.

Ern

 

Well that doesn't sound encouraging. I'll recheck after warming it up. AFA the leakdown is there a link for finding tdc for each cylinder?

 

Check your manual for the location of the timing marks on your particular bike.
You might also, do a search for valve-adjustment on these forums for some general
guidelines, as well.

P.s. All of the info I've posted has been located in mere moments by googling in a
seperate tab, as I respond to your inquirys. ;-)

Ern

 

Don't despair, run the checks again with a warm engine and your new insights.

Could be you've just not done a proper test the first time.

You've never stated what prompted you to do the test in the first place.
How's the bike currently running?

If it's running fine, sure there's always room for improvement, but it's not the end of the world. ;-)
Also, read my sig. I would wait for more feed-back from other members, too.
I'm a decent wrencher, but NOT a professional, by either vocation or training. lol

Ern