Posts
9
Joined
3/13/2020
Location
Newport, NC
US
1225dirtflinger
1/31/2021 3:53pm
1/31/2021 3:53pm
Edited Date/Time
2/1/2021 4:32pm
2020 yz250f
Had 2 exhaust valves drop , had everything in the top end in a jam. Timing chain , cams the whole 9 yards. I took everything apart free the cams and timing chain. Broke down rest of the top end also checked the cylinder was good crank and rod was good. I am replacing the piston / rings the head , everything in the top end is getting replaced with new stuff OEM. Question is not knowing what stoke the motor is in at the time it stopped. With no way of checking the valves to see if there loss and the cams facing the right direction. Do I put the top dead center marks on flywheel make them line up then proceeded with building the motor or what is the best way to go about this ?
Had 2 exhaust valves drop , had everything in the top end in a jam. Timing chain , cams the whole 9 yards. I took everything apart free the cams and timing chain. Broke down rest of the top end also checked the cylinder was good crank and rod was good. I am replacing the piston / rings the head , everything in the top end is getting replaced with new stuff OEM. Question is not knowing what stoke the motor is in at the time it stopped. With no way of checking the valves to see if there loss and the cams facing the right direction. Do I put the top dead center marks on flywheel make them line up then proceeded with building the motor or what is the best way to go about this ?
Im with dynodan tho. Make sure your crank doesnt have runout.
The Shop
Rod might not be straight,
and i think the gytr ported heads with gytr cams comes ready to bolt on for your bike and costs the same as replacing all oem parts 1 at a time. but you have an awesome performance upgrade for the same cost
Post a reply to: 2020 YZ250f top end rebuild question?