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If it were my bike I'd get rid of the RK head and use the OEM head. Then I'd use the OEM needle, jets and slide plus the exhaust (if available) and the OEM spark plug. During rebuild I'd check: reeds rubber flange the carb sits in flywheel and especially the woodruff key ignition pick up and if it sits tight power valve (ease of movement) Then go for a test ride and see if the engine sounds normal. For me the engine sounds strange in all your videos. You may remember that I asked you on Thumper Talk which camera you use because all other vids I have seen the 300 GG's sound way different. I really admire you for being so patient and not giving up. Sorry for bending your ears and writing so much, but I need to mention that I don't like it if a needle is used in its lowest or top position. You mentioned that you have your NECH in fifth(!) position and the AS only open 1 turn. For me that indicates that something isn't right. I have jetted quite a few 300 Gasser's and at standard temperature (18 C or 65F) and with either a 40 or 42 pilot jet I never had it at less than 1.5 turns out, most of the time between 1.75 and 2 turns. Maybe someone can borrow you an identical carb for testing. Unfortunately the US is so far away otherwise I had sent you mine. I can't ride anyway, we are all under quarantine due to Covid virus. If all the things mentioned above are good and there are no air leaks you can start to play with the carb. Maybe a JD kit (worked for me very well on 3 Gassers) would be worth a try. Good luck! Doc |
Even at 44 seconds on the downhill she sounds likes shes lean with erratic idle. Like others said.. check your engine for air leaks.
Also take the time to cc the trapped volume.. especially if you've had a failure. Double check timing.. and I wouldn't bother with iridium plugs in a 2 banger. |
I got my cylinder and piston today so I am going to start the rebuild process and then pressure test.
I pulled the flywheel and everything looks good visually. I think part of my problem is I don't know what it is "supposed to sound like" other than what I hear on videos and that is always hard to judge. This is my first 300 and first 2 stroke since my rm125 in 1999. Should have pressure test done in about 2 hours or so. |
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Put it back together and it dropped from 7 psi to 5psi in 3 minutes. I found bubbles at the base gasket which is weird because it is brand new. Its a paper gasket, would you recommend using a sealant on it?
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I used some ultra copper sealant on the base gasket and now it is holding 6 psi for 16 min now.
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Sorry I responded to page one of this thread. |
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