ok so this is my first time taking apart a four stroke motorcycle engine and of course I've hit an impass... could someone please tell me how to pull the valves and cam out? I thought that the pins were flat head but it seems that they don't screw in... pics are below...
Thanks
-Brandon-
Cam removalCam removal
the knurrled thing in the center is a threaded nut.Need to loosen that to sep. the cams.To pull the rocker shafts I have just run screws in the them part way since they are threaded and grab the head of the screw and pull out with pliers.You may want to trun them with a screw driver alittle to see if they are free in the casting before putting the screw in them.They should pop out.Hope that makes sense?
well once I realized I couldn't turn the engine over as one of the pistons was rusted shut.. I pulled out the cut off wheel and cut the chain and removed the head. Then with some persuasion from a 4lb hammer removed the cylinder... the underside of the cylinder was ok so luckily I just have the top end to worry about... so I guess I need to look for a new head and look into getting the cylinder re-sleeved... so any advice would be welcome as I'm new to this, and I don't know if the way I'm going about the is the best or easiest... also if anyone out there knows of someone who has a spare head / cylinder / engine... that they want to get rid of... send them my way...
Thanks -Brandon- ps: I also realized after I pulled everything apart that my cam gear is cracked so if anyone knows where I can get one of those let me know
Camshaft removalMany thanks ! I have been puzzling on how to go about this very thing. I tried putting a screw in the rocker arm pivots, but couldnt pull it with my hands and decided that discretion was in order. I also didnt know about the nut in the center keeping the camshaft together. Now I can go about properly cleaning my "beauty."
Thanks Moneypits Also, you need to loosen the nut with the lock washer until it is even with the end of bolt, and smack it in with a hammer to remove left cam. Heads and cylinders come up often on eaby, and sell for a reasonable price. I highly recommend that you buy Bill Silvers engine restoration guide, available on this site!
davomoto
cam removalGot the cams out last night. It was more involved than I thought, since I also had to drift the bearings out. But everything is out, and I didnt break anything ! Afte I get everything cleaned, I think it would be advisable to go over the head with the heat gun to make insertion easier, right ? Any other tips from the more knowledeable about inserting the cams back into the head ? (By the way, I think the cam set-up is a work of art now that I've removed them.)
Moneypits
Re: cam removalI doubt ya can get the head hot enough/long enough to make a difference. HONDA recommends hard wood to remove/install the cam and bearings and I use soft brass rods that I've had for years to do mine. Be sure to place the follower pins/shafts in the proper place. Big end intake/small end exhaust Look at the hole in them and you will know which has the big/small ends. The cams will center as ya knock them left/right and have an equal amount on both ends. Then as ya install the points plate (install seal first) and the left side cover the cams will be centered as they are tightened in place. How bad was the rust in the head?. ........................lm
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