Andy bauska 27 Posted January 27, 2022 Misterclean, I put a Brand-new coil on it, and threaded the spark plug boot on it, I so I don't think that's the problem there. And as for the vent lines, I haven't checked them out, but I would assume they are clean. And I pretty much rule out the possibility of my carb having incorrect settings. The other one I swapped it to just runs too perfect for anything to be wrong with my carb. But Vent lines are an easy thing to check, so worth a shot. Share this post Link to post Share on other sites
Fishfiles 20,145 Posted January 27, 2022 Sometimes you have to forget everything that you have done so far and start over fresh in your mind , could be something you have already been over and/or overlooked just throwing some ideas out there , if you throw enough stuff on the wall something will eventually stick Are the glass fuses and fuse holders still on your 300 , I have had a lot of problems with the connections on them and install ATC blade type fuses and solder in ATC fuse holders Maybe it is a fuel problem, seen inside the petcock and or the pickup tube screen in the tank get clogged up and restrict flow >>>> is the gas fresh and clean ?? Did you ever check the output of the voltage regulator Is the timing chain tight with the tensioner ? valves properly adjusted ? does it have good compression ? bent valve stem ? worn out valve rocker arms Flywheel keyway sheared ? 1 Share this post Link to post Share on other sites
Andy bauska 27 Posted January 27, 2022 My dad and I were talking about it last night, and he thinks my timing is a tooth or a half off. He said that on a big V8 engine with the timing a little off it will still idle like a top, but on the top end, it will stutter, and not run well. I think this is a possible cause. And beings that I'm only getting 165lbs of compression, it's possible it bent a valve slightly. Share this post Link to post Share on other sites
Misterclean 418 Posted January 27, 2022 30 minutes ago, Andy bauska said: My dad and I were talking about it last night, and he thinks my timing is a tooth or a half off. He said that on a big V8 engine with the timing a little off it will still idle like a top, but on the top end, it will stutter, and not run well. I think this is a possible cause. And beings that I'm only getting 165lbs of compression, it's possible it bent a valve slightly. That's too much compression if it has a compression release on the cam. The valve timing is not off for sure. I would check the spark plug cap by unscrewing it from the wire and holding it on the spark plug some way. Share this post Link to post Share on other sites
Fishfiles 20,145 Posted January 27, 2022 23 minutes ago, Andy bauska said: My dad and I were talking about it last night, and he thinks my timing is a tooth or a half off. He said that on a big V8 engine with the timing a little off it will still idle like a top, but on the top end, it will stutter, and not run well. I think this is a possible cause. And beings that I'm only getting 165lbs of compression, it's possible it bent a valve slightly. Oh , 165 psi !!! And this was a fresh rebuild , eh ? --- you should be 200 psi - 210 psi , is what the book says , a bent rod will cause loss of compression , as will a stuck valve , you ever put your hand over the carb inlet and spin it over , can you feel the suck in and then compression ??? Bent rod and it will run , but not to full performance ---- I bent the rod on my Bronco once and that was hard to figure out at the time in my early 20s ---- did your bike ever ingest water that you know about ? That will bend a rod , a carb leaking fuel into the cylinder when parked can cause a bent rod also , when you go to start up with gas on top the piston Share this post Link to post Share on other sites
Fishfiles 20,145 Posted January 27, 2022 2 minutes ago, Misterclean said: That's too much compression if it has a compression release on the cam. The valve timing is not off for sure. I would check the spark plug cap by unscrewing it from the wire and holding it on the spark plug some way. MC , the 300s have a mechanical compression release lever , they run 210 psi compression when fresh 1 Share this post Link to post Share on other sites
Misterclean 418 Posted January 27, 2022 1 hour ago, Fishfiles said: MC , the 300s have a mechanical compression release lever , they run 210 psi compression when fresh I wad thinking about that while typing. Couldn't remember when they went to auto comp release. Share this post Link to post Share on other sites
Andy bauska 27 Posted January 28, 2022 The Honda is alive and well!!!! I pulled the valve cover off and sure enough the cam was one tooth off. She runs like a dream and revs all the way up! 6 Share this post Link to post Share on other sites
Andy bauska 27 Posted January 28, 2022 Thank you all so so much for your help and comments. 3 Share this post Link to post Share on other sites
Misterclean 418 Posted January 28, 2022 Congratulations!!!!!! Share this post Link to post Share on other sites
Andy bauska 27 Posted January 28, 2022 Thanks! I'd would've have replaced a lot of stuff in the electrical system before I would've found it was out of time. 1 Share this post Link to post Share on other sites