Originally Posted by
xjqkz
I bought a used (with 2 gals) go tech 3 port engine (turbo plug). According to the guy it ran find but I cannot tune it for the life of it. I've read in several places that these engines are known for their sensitive carb. My question is how do I tell I've the older carb or a newer one? 2nd question if it turns out that I have to replace the p/s/r then is it possible that I can put the 5 port piston/sleve/rod in this crank case?
with 2 gallons on it it is just broken in if it was taken care of,and you should need to remove the break in head gasket.[with head off there should be 3 shims] You should just be able to turn it over by hand with the flywheel attached. and it should make a nice poop sound. if not you have some options.1;22racer on this thread will pinch the sleeve for you at a reasonable price. He is a quality individual. As far as all the internals swapping out I do believe it depends if it's the race or rtr sport version. I am sure you will get some one with a ton of knowledge to help you with this matter. also make sure that the head bolts are tightened down as well as the glow plug. As far as tuning I would seal everything up with some red rtv sealant. Also the seals on the carb needles will leak over time but you can make some out of fuel tubing. read back a few pages I believe it was grizz who tells how to do it. If you have good compression it sounds like you have an air leak. So if I owned it-1 seal it up,-2 install new glow plug,-3 set needles back to flush, if newer carb[red go on front] hsn 1/2 turn in from flush,lsn 1 1/2 turns in from flush. fire it up see what happens. No or low compression you have problems.Also if you do have compression you need to replace the wrist pin,c-clips and rod asap. Can I ask what you paid for it?