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450 motors


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OK i have a 06 yfz450 motor that has a hole in the bottom end by the shifter shaft and i know 04-05 yfz has 11:9.1 comp and the 06-08 have 11:4.1 if i where to use a 04-05 bottom and and mate it with my 06 head and use my 06 piston would i get the 11:9.1 comp or would i have to use the 04-05 piston?

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OK, im about to atempt my first rebuild i have a manual and everything i have to put a new hot rods crank in put all the new athena gaskets i bout a 05 yfz bottom end b/c my 06 is cracked puttin my 06 head on the 05 bottom end, how hard is this to do and when i split the case whats the best way to do so and will anything come flyin out at me?

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OK, im about to atempt my first rebuild i have a manual and everything i have to put a new hot rods crank in put all the new athena gaskets i bout a 05 yfz bottom end b/c my 06 is cracked puttin my 06 head on the 05 bottom end, how hard is this to do and when i split the case whats the best way to do so and will anything come flyin out at me?

Nothing should coming flying out. Lay it on it's side. It may sound like a pain but get a digital camera and take pics step by step. If you get lost anywhere you can just refer back to the photos.

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So i was taking the nut off the flywheel i had the motor on its side and all of a sudden i hear something it the ground i dont know if its a bearing out of the motor or what it about 1/4 inch round and i was thinking theres noy way a bearing just feel out of this motor nothing is lose yet all the gears are still together everywhere were theres a bearing everything is still tight i dont get it and if it is a bearing i would of known i would of been able to spin the crank or anything else you can spin to move the crank, its weird

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So i found out what that ball was, i was looking in the manual for once finding out what it is and the bearing looking thing is on the inside of the clutch cover theres a pin that moves on a bearing and the metal ball rest on the end of that pin

wait until it come times for the shifting mechanism, drum and shift forks...:aargh: good luck.. are you uing your 06 crank, cylinder and piston??

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I got the whole engine apart,really easy if you have the smarts it isnt that hard. Ill post pics sometime soon of the engine apart and ill post more as i put everything back together

I only ran into 1 problem the bearing on the balancer one of the bearings is missing and it got chewed up in the motor i found all peices and blew them out and cleaned everything really good, im just wondering if i should get a new bearing because its only 1 small bearing that missing its like 1/4 inch long and 1/8 inch round

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I got everything back together, i lined up the fly wheel and put the cams in time everyting is on all is left to do is put the clutches back in and put the clutch cover back on then bolt it back onto the bike.

I was wonder if you crank the motor using a socket and its not in time can you bend the valves if its not in time because i cranked the motor and it sounded smooth i could hear the compression.

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I may have said it before but i have a 05 bottom end and a 06 hjug and head on my 06 yfz450 got everything back in and started it today it started right up but i heard a tapping noise i think its the valves they may need ajusted, the motor has a new hot rods heavey duty crank which is 1.4mm longer than the stock rod and its im time the bike rev no other.

also another problem i have now is the clutch has alot of free play when i sqeeze the clutch it goes back out some and i have push it out the rest of the way does anyone know if the clutch cable is shorter or longer on the 04-05 to the 06-08 yfz?

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