45mph at ~7600rpms

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kerwin50

New Member
Apr 18, 2012
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cameron mo
Well I've been really looking and researching everything. It almost seems better in the long run to use the shift kit to begin with rather than the headaches of the rag mount and sprocket adaptors as well as the chain tensioner.
I know being a newbie I should start out more simple but I have a lot of experts here to guide me along.

Speaking of model airplane engines. I fly gassers. We still like to keep our rpm down in the 6 and 7 thou mark.
We have the same issues with the cheaper china engines as the MB'ers have.
Another thing is a MB engine is designed for a side thrust load. Where as an airplane engine is made for a pulling type load. I think on my DLE 30 you'd snap the mounting lugs and case decause of it's cantilever crank. http://www.towerhobbies.com/products/dle_engines/dleg0031.html
Now a zenoah G62's crank can handle a side load I don't know about the mounting. I do know the G62 is abaout as strong as your going to get
http://www.horizonhobby.com/products/super-cub-dsm-rtf-ZENE62A
Of course you can pick these motors up in good used condition for around 250 http://www.horizonhobby.com/products/super-cub-dsm-rtf-ZENE62A
 

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kerwin50

New Member
Apr 18, 2012
9
0
0
cameron mo
2-strokers power better at low RPM's where 4-strokers like the high revs for the power band.

If you want to see perfectly balanced high performance 2-stroke motors look at large scale model airplane motors, not enough power for real speed on a MB without gears but pretty cool.

kerwin50, Jackshafting a motor kit with a shift kit so it uses the pedal gears really isn't something for a first time builder, it costs as much as the whole motor kit itself, and no picnic to attach right either.

If you can pull it off right however gears change everything, even just a 3-speed hub. If you have ever drove a manual shift car picture a 3-speed car but you are always in second gear. It sucks off the line and tops out too quick. That is a stock direct drive MB.
It really seems that a shift kit will help the 2 stroke motor out.
I had been leaning towards a 4 stroke, but if I can get a 2 stroke to do the work and be fairly dependable I may go that route.
I can understand the cost of the shift kit but I'm really thinking that way.
I know I would hate boggy take off's and limited speed.
Will a shift kit fit a frame with a 1 piece crank?
 

k.mah

New Member
Nov 22, 2012
173
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0
oceanside,ca
I wish i had a shift kit at this point. My goal is 50mph with the single speed.
I fabricated a yz80 pipe up to the bike and re jetted the carb. TORQUE IS INSANE! As for top speed increase...not sure yet. I hit 46 on my speedometer going down the street, but it now pulls up a 15-16% grade (checked on mapmyride) at 37mph!
Im finally accepting I probably won't hit 50mph, til i switch out the 36t sprocket for a 32t, then its game on again.