Compression tests - SV650.org

31-05-11, 05:26 PM

Well, I have done a compression test as I have checked almost everything I can to solve an odd running at lower RPM.

Anyway, I have tested them and peak psi is;

Front 220
Rear 200

What do you make to that?

31-05-11, 06:02 PM

The front is 20 more than the rear, hth.

31-05-11, 06:06 PM

The rear cylinder peak pressure is 90.9090909% of the front cylidner peak pressure.

Sid Squid · 31-05-11, 07:17 PM

Very very generally speaking more than one atmosphere between cylinders is the limit, that said I reckon they're both good enough, if you have a slow speed running problem I think you'll need to look elsewhere.
Specific knowledge of your precise engine would be the best thing - find someone who knows those engines and ask there.

01-06-11, 12:09 AM

There dont seem to be too many people around on the aprilia forums that know a great deal about this subject tbh...

Im clutching at straws atm trying to figure out why my bike is running like a **** at small throttle small RPM. I've done a lot of things like vacuum, injector spark plugs all that. Replaced most of it, still no good. Its something that has come on in the last few thousand miles and last 6 months, so its not really somethng that I have done as far as I can tell. Just odd.

Out of interest as a education, what would low compression on one cylinder feel like?

31-05-11, 05:26 PM	#1
ThEGr33k Guest Posts: n/a	Compression tests Well, I have done a compression test as I have checked almost everything I can to solve an odd running at lower RPM. Anyway, I have tested them and peak psi is; Front 220 Rear 200 What do you make to that?

31-05-11, 06:02 PM	#2
Bluefish Guest Posts: n/a	Re: Compression tests The front is 20 more than the rear, hth.

31-05-11, 06:06 PM	#3
monkey Guest Posts: n/a	Re: Compression tests The rear cylinder peak pressure is 90.9090909% of the front cylidner peak pressure.

31-05-11, 07:17 PM	#4
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	Re: Compression tests Very very generally speaking more than one atmosphere between cylinders is the limit, that said I reckon they're both good enough, if you have a slow speed running problem I think you'll need to look elsewhere. Specific knowledge of your precise engine would be the best thing - find someone who knows those engines and ask there. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst"

01-06-11, 12:09 AM	#5
ThEGr33k Guest Posts: n/a	Re: Compression tests There dont seem to be too many people around on the aprilia forums that know a great deal about this subject tbh... Im clutching at straws atm trying to figure out why my bike is running like a **** at small throttle small RPM. I've done a lot of things like vacuum, injector spark plugs all that. Replaced most of it, still no good. Its something that has come on in the last few thousand miles and last 6 months, so its not really somethng that I have done as far as I can tell. Just odd. Out of interest as a education, what would low compression on one cylinder feel like?

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