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Bad oil injector?
Posted: Thu Nov 01, 2007 7:20 pm
by TreeSquid
So, my girlfriend just bought an 86 Spree with about 4000mi on it, and it was running poorly, so I cooked the muffler and now it runs beautifully (makes it over 30 on flat ground), but it's putting out a lot of smoke. The smoke is blue, not white, so I don't think it's just running rich, which just leaves the idea that the oil injector is giving too much oil. Please correct me if I'm wrong, I'm really new to 2-stroke engines. Anyway, since the spree's oiler is gear-driven by the engine, I don't know how I would go about slowing the flow of oil, or if I should at all, etc etc. Should I just buy another oil pump, or is there some way to fix this one, or is there something else going on that I'm totally missing? Thanks!
Posted: Thu Nov 01, 2007 8:05 pm
by Dac
allot of smoke means its running rich. not bad for the motor but you will go though plugs allot. running lean you will burn up your cylinder. its hard to find that perfect spot.
When you remove the throttle cable from the carb. there is a little needle sticking out of the slide. If you disassemble the slide you will find that the needles position is adjustable. Moving the little adjustment clip up will make it leaner.
When doing stuff like this it is smart to do a Plug Chops.
READING SPARK PLUGS and JETTING and PLUG CHOPS
Two stroke engines are sensitive to the level of heat inside the engine.
The main jet size in the carb is the main determiner of how hot the engine runs at wide open throttle.
Too hot and they will seize the piston.
Too cool means they are not making full power.
Engines get the hottest when they are running at wide open throttle making maximum HP.
"Reading" a spark plug is the best way to see how hot your engine is running.
Reading the plug means looking at the ceramic insulator inside the plug and checking its color.
The color will indicate the overall level of heat in the engine.
Reading the plug requires fully warming up the engine by running it for about 10 minutes... Then making a top speed full throttle run for a half mile or more, then killing the motor and stopping and pulling the spark plug on the spot.
That is called.."Doing a plug chop".
When doing the "plug chop"... It is important to chop the throttle and turn the engine off with the switch or key and then pull over to stop... You don't want the engine to idle... that will change the plug color.
You can wait till the plug cools... the color won't change.
The color of a plug on a correctly running engine is a light brown or tan color.
Lighter than that means danger of a piston seizure.
Darker than that is OK... But real dark or wet looking means your main jet in the carb is too big (too rich)... pull it out and look at the number on the side and buy the next size smaller (leaner).
Note... To get an accurate plug reading takes a fairly new plug... a plug with 2 years of crud on it will never really show the true color (or heat) the engine is running at.
jetting is hole nother way of fixing it but jest are like 5$. and my way is free. Note- Do Plug Chops. smoke is kinda a good thing. with blue smoke you know you are not going to burn up your cylinder. Running lean you will toast your cylinder and put dent in your wallet.
Posted: Fri Nov 02, 2007 9:33 pm
by TreeSquid
So, moving the adjustment clip up means moving it further up the needle (away from the point), thus exposing more of the needle? Or the other way around? Thanks a lot, by the way, you guys are extremely helpful, I've been using this site to work the kinks out of my gf's spree for a couple weeks now.
Posted: Fri Nov 02, 2007 10:10 pm
by Dac
Yeah, like what you just said. If after doing this you run to lean just undo. Moving the clip down makes it rich, up makes it lean. If you got allot of smoke your running rich, there for you want to lean it up some.
im not sure were you live but pending if you live some were its cold out. you might want to keep it the way it is. Cold makes the 2 stroke motor run lean.(basically what you need) .
unless this is causing any problems you might just want to keep it this way. running lean and burning up the motor is a pain. cylinders+piston+ rings are not cheap.
Posted: Sun Nov 04, 2007 1:45 pm
by TreeSquid
It's not all that cold where I live, hasn't made it below freezing here yet, but I leaned it out one notch (the clip was in the middle of the three) and it's still spewing a lot of smoke, though not quite as much. I'll do some plug chops and make sure all is good, but right now it looks like it's still rich, so I should be OK. Where does one buy a new needle/float valve for a spree carburetor, anyway, since when those start to crap out, they like to make things run really rich?