MOPED ARMY

Where can I find a higher comp head?

Can I mill the extra stock head I have to create my own?

Thanks for the reply!

Add 19mm carb and a easy 50mph with a 150lbs rider.

.5" = 12.7mm

also I think the Mamba is more low end power isn't it? to go faster you needs either higher RPMs or lower gearing to get to higher speed.

nice looking ped by the way.

Wow. Would just increasing the size of the carb increase my speed that much? On the tuning spreadsheet it seems like carb size doesn't have much of an effect.

I weigh around 130.

I never changed the port timing even with running the 19mm .. it blast and blast for us in htown. Tho, I did match the exhaust exit hole to a polini exhaust gaskt and I think we matched it to the polini 19mm intake..

Thanks!

Sorry bad math on my part! It was a 7/16 drill bit.

7/16 in ~ 11.1125 mm

Yes the Mamba has great punch in the bottom and midrange, which is what I'm looking for in city driving and hill climbing, but I'm also hoping to squeeze 10 more mph out of the bike for the flats without sacrificing on hills too much.

Impossible dream?

From combing the forums, seems like people are usually able to hit 35-45 with the Mamba even thought it's a 'low/mid pipe'. Maybe that's only with a Polini up front.

I am having the same problem except I don't have a performance pipe yet.

I bored out my SHA and intake to 14mm.

Port matched.

Widened transfers.

Raised the exhaust port 1mm and widened it

Topping out right around 30. I got a tecno circuit coming next week. I will let you know if I can break the stupid 30mph barrier with the pipe.

I feel your pain! Good luck man!

hmm, I remove material from the piston also.. "chopped".. to get it do the higher rpms revs.

i'm kinda anal when it comes to engine building. i always pull everything apart and replace all the bearings and seal. then give every part a deep cleaning. make sure there arnt any weird shit going on. (chipped teeth, 40 yrold garbage, or whatever the PO may have effed up.

i'm not familar with the 25mph cylinder but theres usually plenty of meat on the cylinder to open up intake exhaust and transfer ports. i never had problems with stock head..but it's better to turn it than mill it. (edited)

made in japan, back in the day.. no one could get mukunis :) well, that is what the old timers tell me. (edited)

Thanks for all the input on this guys! Any other suggestions are welcomed and appreciated. I'm definitely going to try all that I can and report back with what I find.

Thankyouthankyouthankyou