So I decided to blow off some steam yesterday afternoon on my TX-50. I swapped out the Champion L82C for an NGK BR6HS just for the heck of it. Well the L82C plug had been in there for awhile anyway. The L82C plug was black but not completely fouled.
Anyway after about 15 minutes the engine starts smoking worse. The engine seems to be loading up with fuel. It will bog down at times but does not stall. Maybe I can talk my wife into shooting a video while I'm riding it.
I enquired about a knockoff Deloroto carb a guy on Ebay sells and he suggested I do some troubleshooting because he doesn't think it's the carb. Bascially the same thing Trash Truck said could be wrong with the engine.
The reason I'm not sure it's the carb is because there are really no servicable parts inside the Deloroto SHA 14 12 P carb other than the float valve. I know the float valve is OK because I can leave the fuel on with the engine not running and it won't leak fuel. That would be my assumption. I can also turn the carb upside down and blow through the fuel inlet and feel back pressure.
Typically a leaking float valve would cause the engine to load up with fuel. Well on a four stroker anyway.
First of all let's talk about the fuel/oil mixture. Am I running too rich of an oil mixture?
I am running a 40:1 mix. I know that Tomos calls for a 50:1 mix but is that too rich for a 49cc engine? That's another story but in a nuttshell my Trabant 601 calls for a 50:1 mix but the consensus is a 40:1 mix is better and does just fine. But the Trabant has a 600cc engine.
My Kinetic TFR calls for a 32:1 mix and does not smoke! Or should I say did not smoke when it was running.
I have run Opti-2 in my Tomos which is a 100:1 mix but covers all ratios and I think it smokes just as bad with it.
The smoke is blue. There is no oil injection system on this bike. Pre mix.
Compression: This engine has a 9:1 C/R according to the manual. What is the minimum compression before the engine needs new rings?
Clogged muffler/exhaust port:
I have heard filling the muffler with Drano and letting it sit over night is better (and safer) than filling the muffler full of laquer thinner and lighting it up. Any tips on that?
Also can't find any evidence that transmission fluid is leaking into the combustion chamber. Just based on the level in the gearbox.
In summary, engine smokes worse than I would expect, seems to be loading up with fuel at times. Seems to get worse the hotter the engine.
Any other things to check for?