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CB350 Broken Spark Advancer Pin

3648 Views 4 Replies 4 Participants Last post by  captb
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Hey all,

My engine hadn't been running very well recently, so I decided to clean up the points. In doing so, I also replaced the beat up screws used to lock the points down with metric hex bolts. I tried to kick start the bike, and there was an incredible resistance. It turns out that replacing the bolts was a mistake, they were too long, and actually hit the spark advancer right behind the points plate. I took the bolts back out, and put the old ones back in, and I could kick it no problem. But I couldn't get it to start. It would only make a loud bang every couple kicks, no running. I figured I really messed up the points, so I decided to drain the oil, take off the stator cover, and get the timing just right with a new set of points. However, I couldn't get the new points anywhere close to being right. thinking that there was a bigger issue, I took the points plate off, and removed the spark advancer. This is when I realized that the little pin that holds the spark advancer in place had been pulled out of its hole! apparently, when I tried to start the bike with the points plate bolts that were too long, I widened up the hold that the pin goes into and destroyed it.

This is where I need help. I just rebuilt this engine only 100 miles ago after the cam chain tensioner broke and bent some valves, and I had only rebuilt the engine 500 miles before that. I REALLY don't want to take this engine apart again to replace the camshaft after this stupid mistake. Is there any way I can fix this without taking the engine apart?

Thanks a lot for your help!

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It can make more work if the timing changes. Back in the day my friends new 72 SL350 couldn't keep up with my 68 CL350 so we bumped his timing up, a bit too far I might add, the piston looked like the one in the pic. Honda still fixed it under warranty thou. The later SL350s were lite weight but were a dog without putting on a CB/CL head, cam and bigger carbs.

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