two stroke tuners guide

[twisted - bones]

Here is a link some may find interesting and others will find confusing. It is a pretty long read but it goes through all the port timing, exhaust tuning and a bunch more good info. http://www.datafan.com/TunersHandbook/2-strokefiltered.html

 

[Dan Dirt]

Twisted bones,


I am new to these types of motors. I have raced 1/8 scale Nitro for a few years and this is my first 1/5 scale. Can you give me the quick basics on tuning. I was just running and it felt like it was rich bogging of the start. I turned 'in' (CW) the high-speed needle, which I am used to being the direction for leaning and the bog got worse. I then screwed out (CCW) the needle and it felt much more responsive. Is outward turning (CCW) leaning? Sorry for the stupid question.

 

[Dan Dirt]

Never mind, screw in clockwise has to be leaner. There must be other problems, engine runs for a bit then stalls. I am going to check the tank hoses, vent cap? Hopefully I get her raging soon, I bought it a few weeks ago, and all wrenching/rebuilding no running. Boy does it look good though.

 

[dunerrunnner]

tooo complicated....

 

[Sprint 77]

Its a good book I have a copy. Been out of print for years hard to find.

 

[racetruck]

you have two needles a low speed and a high speed needle adjust the low speed needle to get it to idle then rev the engine if it bogs turn the high speed needle in a 1\4 turn at a time till it revs good you may have to adjust the low needle to get it to idle

 

[Sprint 77]

you have two needles a low speed and a high speed needle adjust the low speed needle to get it to idle then rev the engine if it bogs turn the high speed needle in a 1\4 turn at a time till it revs good you may have to adjust the low needle to get it to idle

Will keep that in mind next time I need to adjust the carb.


As for pipe fabricating and port timing formulas I will stick to this book.