rebuilting a 1997 cr 125

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#1
what all....do i need to rebuilt my motor i think the rings are bad...the bikes smokes really bad and has no power... i changer the tranny oil air filter gas mix and even repacked the muffler....so do i just buy a piston kit and top end gasket kit..?
 
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#2
Smoking is not necessarily an indication that you need a top end rebuild.

What color is the smoke? Is it blueish? That's normal if you have a 2stroke. If so...

1 Is your jetting correct?
2 Is your air filter clean?
3 Is your float level set correctly?

Before you go tearing down your motorcycle engine, it's best to correct any jetting issues, clean your filter and adjust your float level.

If the smoke is a different color, then you "may" need to rebuilt your top end.

"If" you need a top end, you'll need the following (at a minimum)

Service Manual for your particular bike
Top-end gasket kit
Piston
Ring(s)
Wristpin
Wristpin circlips
Wristpin bearings
Radiator coolant (50/50 with distilled water in general)
Circlip pliers
Ring Compressor
Moly Grease (if applicable)
Small File (may be needed to file ring edges, if applicable)
New Spark Plug

If you do a top end without making sure your jetting is okay, you may very well be doing another top end 1 hour after your first one...
 
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#5
Wiseco makes good pistons and rings.

Oil coming out the pipe and header is normal for a 2 stroke.

The white smoke would seem to indicate you are leaking some coolant.

Sounds like it's time to get that service manual and use it
 
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#7
yea..i dont have a manual....lol..ill have buy one on e-bay....but it smokes white and sprays oil...out really crazy...its not normal...all over the ground and my tire...
 
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#8
so how would it smoke white...if coolant... wuz leaking like on the piston..? or what...that would not mean a blown ring or whatever u call it with all the oil and smoke
 

IndyMX

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#9
dansdr125 said:
so how would it smoke white...if coolant... wuz leaking like on the piston..? or what...that would not mean a blown ring or whatever u call it with all the oil and smoke
That would be a gasket leak... Head Gasket or Cylinder gasket.

Water doesn't smoke, so much as it creates steam, which will appear as White Smoke.

I might also suggest some english language classes. It will make your posts appear more intelligent and easier to read. :whoa:
 
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#10
ok...but i should do the piston...and rings anyways...right..?and thats the problem why im lacking power to
 

IndyMX

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#11
You should tear it down and measure the cylinder & piston, to see if they are out of spec. A service manual for your bike will give you all of the correct specs.

If all that is good, then you shouldn't needs to replace parts just yet.

But I would definitely put a new gasket set in there.
 
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#12
ok...i think im going to just put new piston and rings and gasket how hard is it to tear it down and remove the piston and rings and is there any special...tools u need and whats the tq spec..?thanks
 

IndyMX

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#13
dansdr125 said:
ok...i think im going to just put new piston and rings and gasket how hard is it to tear it down and remove the piston and rings and is there any special...tools u need and whats the tq spec..?thanks

you will find all of that info in your service manual.