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Discussion in 'Motorized Bicycle General Discussion' started by Retmachinist, Jul 24, 2009.
I run an ngk b6hs spark plug.
i just broke in my new 66cc motor with opti 2. i mix 1.8 oz pouch with 1 us gallon of mid grade gas and rode it not hard but not easy. just rode it. it will 4 stroke on you some do, some don't so they say. mine did a lot, but that's ok getting plenty of oil that way.
after the one gallon has run through it i mix 1.3 gallon to 1.8oz of opti 2 and run it from now on.
i am on my 2nd tank of 100:1 now it runs fine.
i am in the processes of re jetting the carb now. its a little screamer.
now that's what i did. DISCLAIMER your results may be different.
Thanks. Im gonna order Opti - 2 from Amazon.
I had to adjust for my mix too, I'm running the sbp expansion chamber and the dax gtr50r carb, both which use more fuel, and I still needed to change the jet from .75 to .70 to keep from four stroking. It's all pretty easy fixes though to get the powerband perfect! Now all I worry about with my HT is snapping the keys on the chain side sprocket
I still cant kill it once its hot.... It just continues to run, even if there is no spark.
What about trying the next cooler range park plug?
There's an idear
Yeah, dieseling is not good. It will destroy your motor.
My goes ZOOOOOM instead of Braaaaaaaap all the way from idle to top speed, that's what you wanna shoot for. No 4 stroking, just the pure dirtbike kind of sound (2 stroke dirtbike that is )
thats what i am shooting for ZOOOOOM instead of Braaaaaaaap. i am beginning to think this nt carb is a pice of !#$$^***(*%$$%&^&**(((((((( translate crap lol i can't seem to find the sweet spot. i think it is MIKUNI TIME!!!
Don, if you get an expansion chamber and the RT carb from dax you'll be set. The RT carb is GREAT for me, I love it! It is monster torque, good quality, and way cheaper than the mikuni!
Take the jet out of that NT solder it up and redrill it with a #73 wire gauge bit and put the clip on the metering needle second notch from the top and I'll bet you see a big difference in how it runs, just do the good ole plug check to make sure you aint to lean.......
Great advice mapbike, and just to clarify to those who never rejetted, there is a HUGE difference between a #73 and a .73mm jet, so be sure you understand what you are doing
maybe but i got a bud that has a bunch of 18mm MIKUNI clamp ons from 50cc and 80 cc dirtbikes. i bet i can get one dirt cheap maybe free lol
18mm is pretty darn big, but I still think it's worth a try
mapbike i have been through every number drill from 70 to 74 and ever step on needle and will not stop 4 stroking #73 with top groove on needle gives me best running but still 4 strokes if not in it hard
I really think an expansion chamber smooths these problems out a lot, it makes the engine suck in fuel better and requires richer jetting
i agree with you that the expansion chamber is needed to smooth this thing out. but it will be a week or two before i can get one low on FRN Federal Reserve Notes.
That's fine, you'll get one soon
I think i will change my name to GOLDMAN SACHS if they need money they just have congress print it for them.