Compression test results - Page 2

Triple Jim · July 18th, 2023, 07:27 PM

From the photos of the adapters, I don't see a way to have a valve at the engine end. That means the volume of the adapter will be added to the combustion chamber volume and lower the readings substantially.

That's not to say that it caused the reading to be 40! It's sounding like something is wrong with the cooling system, allowing the cylinders to overheat, and that ruined the engine.

haybaler · July 18th, 2023, 07:50 PM

Thanks for the link.

Sorry for your bad luck. If I wasn't 2500 miles away, I would snap that one up, in a heartbeat, love that Kawasaki Green paint scheme.

haybaler · July 18th, 2023, 07:53 PM

Quote:

Originally Posted by Triple Jim

From the photos of the adapters, I don't see a way to have a valve at the engine end. That means the volume of the adapter will be added to the combustion chamber volume and lower the readings substantially.

I thought my snap-on attachment with valve would screw right into the adapter, wouldn't change the position of the valve by very much, would it?

Animal78 · July 19th, 2023, 03:15 AM

Yeah I still have the Schrader valve it’s a very small amount lost to the end of that adapter and if you turn the engine over enough times it wouldn’t matter.

It’s what it is.

haybaler · July 19th, 2023, 09:14 AM

"It’s what it is."

It's a pretty nice 250 bike, maybe consider teardown, easy enough to get the top end out of there, then inspect to determine actual damage...there's plenty of used parts around, and fresh gaskets available...just sayin'

Animal78 · July 19th, 2023, 10:26 AM

Yeah I have thought of that. It’s just not financially worth it. If I am going to sink time and money into something I have higher priority items. This was supposed to be a cheap fun commuter for me and it’s not turning out like that. I have 4 other motorcycles 3 are off-road and 1 is my Harley that I actually loath.

Animal78 · July 20th, 2023, 03:05 PM

Any differences between the 1987 engine and the one in my 2000? I have the chance to pick up a whole bike for dirt cheap. It’s really rough.

DannoXYZ · July 20th, 2023, 07:56 PM

Different cam-specs, ignitor box. Use your cams on '87 engine so you have more mid-range and don't have to wind it out to redline all the time. Then use ignitor box from older bike.

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July 18th, 2023, 07:27 PM	#41
Triple Jim Guy Who Enjoys Riding Name: Jim Location: North Carolina Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot. MOTM - Oct '18, Aug '17, Aug '16	From the photos of the adapters, I don't see a way to have a valve at the engine end. That means the volume of the adapter will be added to the combustion chamber volume and lower the readings substantially. That's not to say that it caused the reading to be 40! It's sounding like something is wrong with the cooling system, allowing the cylinders to overheat, and that ruined the engine.

July 18th, 2023, 07:50 PM	#42
haybaler ninjette.org newbie Name: Steven Location: Berkeley, California Join Date: Jul 2023 Motorcycle(s): Ninja 250 and Yamaha Fazer 700 Posts: 7	Thanks for the link. Sorry for your bad luck. If I wasn't 2500 miles away, I would snap that one up, in a heartbeat, love that Kawasaki Green paint scheme.

July 19th, 2023, 03:15 AM	#44
Animal78 ninjette.org member Name: Larry Location: Albemarle NC Join Date: Feb 2011 Motorcycle(s): 08 Ninja 250(sold) 2000 Ninja 250 (sold) 2012 Ninja 250r 2020 Harley Sportster (rarely ridden) Posts: 104	Yeah I still have the Schrader valve it’s a very small amount lost to the end of that adapter and if you turn the engine over enough times it wouldn’t matter. It’s what it is.

July 19th, 2023, 09:14 AM	#45
haybaler ninjette.org newbie Name: Steven Location: Berkeley, California Join Date: Jul 2023 Motorcycle(s): Ninja 250 and Yamaha Fazer 700 Posts: 7	"It’s what it is." It's a pretty nice 250 bike, maybe consider teardown, easy enough to get the top end out of there, then inspect to determine actual damage...there's plenty of used parts around, and fresh gaskets available...just sayin'

July 19th, 2023, 10:26 AM	#46
Animal78 ninjette.org member Name: Larry Location: Albemarle NC Join Date: Feb 2011 Motorcycle(s): 08 Ninja 250(sold) 2000 Ninja 250 (sold) 2012 Ninja 250r 2020 Harley Sportster (rarely ridden) Posts: 104	Yeah I have thought of that. It’s just not financially worth it. If I am going to sink time and money into something I have higher priority items. This was supposed to be a cheap fun commuter for me and it’s not turning out like that. I have 4 other motorcycles 3 are off-road and 1 is my Harley that I actually loath.

July 20th, 2023, 03:05 PM	#47
Animal78 ninjette.org member Name: Larry Location: Albemarle NC Join Date: Feb 2011 Motorcycle(s): 08 Ninja 250(sold) 2000 Ninja 250 (sold) 2012 Ninja 250r 2020 Harley Sportster (rarely ridden) Posts: 104	Any differences between the 1987 engine and the one in my 2000? I have the chance to pick up a whole bike for dirt cheap. It’s really rough.

July 20th, 2023, 07:56 PM	#48
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Different cam-specs, ignitor box. Use your cams on '87 engine so you have more mid-range and don't have to wind it out to redline all the time. Then use ignitor box from older bike.