CR85 Problems, won't run!

[KCL]

Taking a look at a bike for a friend, had a recent to end job from the dealer. The bike ran for awhile, then started cutting out. Now it doesn't want to start and when it does it just can't rev up. I checked;air filter, gas flow, compression, and verified the spark while kicking it over. Could it still be something electrical "coil" maybe, or what should I do next ? Thanks.

 

[Morvo]

Try a brand new plug for starters. If that doesn't solve your problem, take your carb apart and give it a damn good clean, check the float level as well. What do you mean by it not revving up?

 

[2 strokes for life]

Some bikes need to have load on them to wined up. But do what Morvo said and you should be good.

 

[KCL]

Even though I see spark, I will replace the plug. By not revving up, I mean that the time I did get it to start, the rpms, "revs" would not increase, it keep bogging and then just shut off.

 

[2 strokes for life]

Then turn the fule and air mixtur screw out and see what happens. You probaaly need a rejet.

 

[Patman]

If the bike ran fine pre-rebuild and it was a stock or near stock rebuild then jetting is not the solution. You may want to take the carb apart and give it a careful cleaning. While you are at it check the reeds even though that should have been something they took a look at when it was apart. Make sure the choke is operating corectly and the fuel is fresh. Then if you have air, fuel, spark and compression it should go boom.

 

[KCL]

Took apart the carb and reeds, inspected both. They seemed fine. Took the exhaust pipe off, found coolant collected in the first bend of the pipe. Looks like the head gasket is leaking bye........

 

[lynch racing]

You will have constant head gasket problems on the 85, They can be fixed but are a pain in the....,watch the float bowl level and float needle rubber seal also,just buy a new one if it has been dry for a time.....

 

[lynch racing]

Sorry ,I forgot to say that if you take the radiator cap off(not while hot!!!!) and there is foam, just shut it down and buy a 5 pack of head gaskets, you will need them. Also find a good machinist and plane the head and wet sand the top of the cylinder on a level surface,Use NO gasket sealants on the head gasket and follow the torqueing specs to the letter...put the gasket on right side up.

 

[KCL]

Why is head gasket leaks such an issue on the 85, and also why no gasket sealer? Thanks.

 

[lynch racing]

casting flaws, just have to keep everything nice and flat and follow specs when putting together, a good quaulity gasket (Cometic) will have a sealing coating on it. No gasket sealer needed or you will have to do it again!Luck to ya!

 

[Patman]

Also if you have a good seal or once you achieve one it's preferable to leave the head one the cylinder when changing ring and/or pistion. Basically don't screw up a good thing LOL.

 

[KCL]

Right....any idea on the head torque specs. for an 03 CR85?

 

[Patman]

I don't carry them around in my pocket but if I remember I'll look it up in my FACTORY SHOP MANUAL which is a good thing to have as you now find out :)

 

[lynch racing]

Also if you have a good seal or once you achieve one it's preferable to leave the head one the cylinder when changing ring and/or pistion. Basically don't screw up a good thing LOL.

Glad you brought that up Patman, Forgot to explain that to him...... :cool:

 

[kadin]

you should try running the gas out of it after trying to kick start it or trying to change the spark plug