found out whats wrong wth my engne - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 8 (permalink) Old 09-02-2007, 12:51 AM Thread Starter
 
Join Date: May 2006
Posts: 88
found out whats wrong wth my engne

we checked it out and theres no compression. theres spark and fuel but no compression. a bud offered to help me tear down the engine and rebuild it. what can be done to correct this?
corteztk1982 is offline  
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post #2 of 8 (permalink) Old 09-02-2007, 05:17 AM
 
Join Date: Mar 2006
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mite try to retorque the head/make sure the nuts and studs arent stripped before you yank it all apart. my engine lost compression immediatly after a few rides, and it was bcuz it had somehow stripped 4 case studs


otherwise if you're gonna tear it all down, do it rite-idk what engine it is, but id say new rings, hone the cylinders, new head gasket, valve job, new valve springs, use a straight edge and check that the head isnt warped, make sure no valves are bent....lots of performance stuff can be done at this time too, but you didnt ask that. may be able to get away with just doing a top end rebuild, but it wouldnt hurt to pull the crank, balance it, and check the bearings...

like i said, depends on the engine-maybe you can just pull the head, make sure its not warped, put a new head gasket on and be done with it.

i think im 4getting something, its like 315am, just got in, cant sleep, wired-back marker has built a bunch of engines2, im sure him or some1 else will correct me if i did 4get somethin
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post #3 of 8 (permalink) Old 09-02-2007, 08:34 AM
 
Join Date: Apr 2006
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first and foremost, figure out WHY the motor lost compression, since usually, they dont just go from 180pounds to 0 overnight for no reason. are your head bolts tighh? valve timing correct(very easy loss of compression), cylinder walls and pistons in good shape? just look at that stuff first and foremost.
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post #4 of 8 (permalink) Old 09-02-2007, 10:54 AM
 
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Have a leakdown test done. About $100. Will tell you what and where the problem is. If the cam chain tensioner went bad, your exhaust valves and seats may be burnt. That happened to my CBR. I'll be doing them next week.
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post #5 of 8 (permalink) Old 09-02-2007, 10:58 AM Thread Starter
 
Join Date: May 2006
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im getting a compression gague. the exhaust doesnt even really have any force coming out of it but the valves are moving
corteztk1982 is offline  
post #6 of 8 (permalink) Old 09-02-2007, 02:32 PM
 
Join Date: Apr 2006
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if you havent used a compression tester, you wont know whether it really IS low on compression or not. your ideal range should be around 200 pounds of compression in each cylinder, and they should all be equal.

if you need a cam chain tensioner, I"ve got a factory one I can give you from my old F2. same tensioner as yours.
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post #7 of 8 (permalink) Old 09-02-2007, 07:12 PM Thread Starter
 
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thats awesome. ill keep that in mind
corteztk1982 is offline  
post #8 of 8 (permalink) Old 09-02-2007, 11:39 PM
 
Join Date: Nov 2006
Posts: 138
the operating range for my 750 GSXR is only 150 something to 200 ish with a minimum of 125 and a max difference of 25 between the lowest and the highest. all in psi I don't remember the exacy range but I know thats close. I don't know how it compares but seams like a good point to start

Also if the compression test shows low compression or non at all then try doing a leak test to find your problem might be a simple fix

Goodluck!
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