Question about 1974 Honda CB 200

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My big red wont start...got spark and gas but no luck.. somebody just did the head gasket so could something been put in wrong?

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Could very easily be so. Does this unit have points and condensers in it. Could be the timing chain wasn't timed properly when the cam gear was installed. Easy to check without having to take too much apart.

First of all, take the cover of the fly wheel and you should see a couple marks there. One may have an F and the other could be a T, align the T with the boss mark on the side of the engine that'll be right along the edge of the flywheel. When you find this, then take the cover of the top of the side of the engine and get access to the cam gear. There also you should see a mark but no letters, only a dent put there by the factory. If you locate that then locate the boss mark on the engine head itself. Now once you have determined all of this. Put a wrench on the bolt keeping the flywheel on usually it'll be a 17mm socket and turn the engine up on it compression stroke. Once at top dead center (when the piston is up as far as it'll go before starting to go down again) on the compression stroke (not the exhaust stroke) the mark on the flywheel with the T on it and the dent on the cam should align with the boss on the engine head. If it doesn't it's out of time. You have to remove the cam chain, then realign the cam gear until the dent lines up with the boss mark then re install the chain and make sure you don't have any slack after you re install. If they align your good to go. If not then you need to do it again. To determine the difference between top dead center on the compression stroke and TDC on the exhaust stroke, you'll need to remove both valve adjustment covers. One in front and one in back of the cylindere head. Turn the flywheel again with the wrench until you see the front valve open and close and then keep watching until the rear valve next to the carburetor come open and then close. Remove the spark plug and put a small straight screwdriver down in the plug hole and then gently continue to turn the flywheel bolt after the rear valve closes until you feel the screwdriver moving. Keep a very close watch on this. When the screwdriver won't go no higher and you notice it to start to go down a little, then turn it back a little until the piston can't go any higher, Now you have the compression stroke you'll need to align all the marks.

Good luck
Skidooer

Good luck
skidooer

Posted on Oct 03, 2009

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Timing is not set right or low compression

Posted on Oct 03, 2009

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I have a 85 250 big red and it has no compreshion... why? only way it starts is jump it in

Posted on Jul 12, 2012

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