Title: Engine Diagnose
Post by: crank on April 24, 2006, 05:51:43 PM
Post by: crank on April 24, 2006, 05:51:43 PM
Looking for a little guidance on trouble shooting Jason's yz450f motor. We want to do the work are self's. Been reading a little,we have the service manual, some internet reading. Sounds to me first we need to do the engine presure test , before tearing anything off? Any comments or suggestion,especially on what to make of the presure change from with-in the motor. As I understand how this presure tells about the rings,values,piston etc...
Also the bike was low on oil(but not empty) and dam near empty of coolant. J thought he could have lost those at one off the up hills about 10 miles from the finish. At least the water, does not look like it was blowing oil out the crank breather tube(Oil might have been low to start)
Should I put the fluids back in and start it? so to listen to it again?,sounded a little noisy when he finished, so he shut it off,
The values do need adjusting. Also though he had clutch problems at the last race, maybe just the clutch?
Also the bike was low on oil(but not empty) and dam near empty of coolant. J thought he could have lost those at one off the up hills about 10 miles from the finish. At least the water, does not look like it was blowing oil out the crank breather tube(Oil might have been low to start)
Should I put the fluids back in and start it? so to listen to it again?,sounded a little noisy when he finished, so he shut it off,
The values do need adjusting. Also though he had clutch problems at the last race, maybe just the clutch?
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Post by: Ghostrider on April 25, 2006, 05:55:54 AM
Post by: Ghostrider on April 25, 2006, 05:55:54 AM
Trade it for a YZ 250. Problem solved.
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Post by: Aaron Austin on April 25, 2006, 08:37:30 AM
Post by: Aaron Austin on April 25, 2006, 08:37:30 AM
Craig, maybe go to thumper talk and see what they think?
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Post by: motojc on April 25, 2006, 11:28:42 AM
Post by: motojc on April 25, 2006, 11:28:42 AM
Top it off with fluids, and run it till it blows then buy one of my old bikes.
What were the symptoms that makes you think there is something wrong?
What were the symptoms that makes you think there is something wrong?
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Post by: JPolliard on April 25, 2006, 02:48:18 PM
Post by: JPolliard on April 25, 2006, 02:48:18 PM
The engine was making a 'ticking' sound. The oil was a little low but the noise didn't start until mile 70 or so. Maybe it was overheating?
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Post by: motojc on April 25, 2006, 06:02:58 PM
Post by: motojc on April 25, 2006, 06:02:58 PM
If you are lucky and it was still running at the end then I suggest adjusting the valves, change the oil and filter, clean the air filter, fill it up with coolant, check the spark plug, change the air in the tires, start it up, run it around the block, scare little kids, piss off the neighbors, take an asprin and call me in the morning. Oh and keep your fingers crossed through all of this...
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Post by: crank on June 14, 2006, 09:14:37 PM
Post by: crank on June 14, 2006, 09:14:37 PM
Update, well Jason and I just finished overhalling the top end of his yz450, kind of. Tore everything apart, values out, cam and all the other goodies. Cleaned and checked all the Dia. with only the rings needing replaced. Overhead values, chain, piston etc... went back together super easy. New oil and h2o second kick and presto- changeo were running. 
Bike is back in business,just needs some new plastic and it's all systems go for the Invaders run, see ya all in the pits!
Bike is back in business,just needs some new plastic and it's all systems go for the Invaders run, see ya all in the pits!
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Post by: Chooch on June 14, 2006, 10:46:05 PM
Post by: Chooch on June 14, 2006, 10:46:05 PM
Quote from: "crank"Update, well Jason and I just finished overhalling the top end of his yz450, kind of. Tore everything apart, values out, cam and all the other goodies. Cleaned and checked all the Dia. with only the rings needing replaced. Overhead values, chain, piston etc... went back together super easy. New oil and h2o second kick and presto- changeo were running.Good job guys! Glad to see you'll be back out soon.