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510thumpstar

426 timing marks

6 posts in this topic

Hi guys i am puttin together my friends 425 and i really dont know what im doing lol . ive done top ends on two strokes a bunch of times but never on a four stroke except a bunch of big bore kits on 50's . this bike broke a valve and we removed the top end the crank and con rod are good but the whole top end is wiped out . since the bike is so old we bought a complete used top end from ebay .. i know were rolling the dice .. basically i need to know how to set up cam chain timing . and i think i can do the rest myself . If anyone could post some pics or just explain how to set up the chain timing i would really appreciate it . the poor guy bought the bike and it ran perfect then rode it for 5 minutes and the valve broke he is a dad with three kids and is outta money do were trying to do it as inexpensive as possible . thanks for any and all replys . Ricky

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oh boy i keep reading all these posts on how to do it and im getting scared lol .. i guess once its done ill be like duh that wasnt that bad .. its just a little intimidating i guess . Ricky

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The actual process is very easy however you have to do everything correctly to avoid a costly or time consuming failure. I've fished the cam cap register half ring from several nooks and crannies of the motor and hunted for a dropped shim for hours only to find it the next day under my truck in the driveway. Key is don't rush anything and follow all the steps.

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