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Couple of things to check. Fuse box Spark Plug wires / Spark plug connector Check the jets for any cloggings. Replace Spark plug just to be on the safe side.

Yeah, it's mostly for people who ride long trails with huge elevation changes and mostly for dirtbikes. There are some bikes no matter how much you rejet you won't be able to tune it, this would suit those kind of application where you encounter a bike which is a pain in the ass to rejet. some...

Yes it would work. The powerjet is used to adjust for high RPMS (mostly doesn't need to be adjusted / but it is there to give you the option to fine tune it) Then there is Idle screw, you might to want to adjust this in 1/4 turns to get the correct idle. All in all you can do big bore / big...

These smart carbs don't have any jets and doesn't have to be adjusted to elevation changes, It is simply plug and play. The needle jet is of a patented design. I have been on the fence of changing my carb and I'm thinking of switching to this. Here's the official specification details from...

What's the issue? I've got a Mikuni 30mm roundslide carb (genuine replacement carb for TZM 150) I haven't installed it due to single throttle design. Would it work with stock throttle grip with a cable change?

Fellow riders and grease monkeys, Please read this helpful info on how Fuel Injected bikes work before venturing into modification. I know that a lot of people are mostly used to Carbureted bikes and are confused with the Fi system. Hope this guide helps you FI/ EFI: (Electronic) Fuel...

Dude, are you still running the PWK 28? what is your current build? I'm running the 57mm setup with UMA high cam (rest stock) and I'm torn between Carbs. On one hand, I want the Yoshi TM-MJN 26mm, on the other hand I want something tested and proven similar to my setup so it would be easier with...

Different C.D.I(s) will make different sounds when you are past the rev limit. It is the sound of your ECU/C.D.I hitting it's rev limit. C.D.I brands with loud rev limit/cut-off sounds (Brands that I know): IKK BRT REXTOR

This guy's explanation and vision on Mechanical Engineering is just out of this world. I find his tips really enlightening Really helpful for those who are afraid to take their carb apart. In this video you will get to know; How Carburetors in general work How to Disassemble a CV Carburetor...

Hi all, I have uploaded complete manual for the UMA Digital meter. This is the refresh lineup from UMA racing. Here's hoping the backlight won't go bad due to being exposed to sunlight for long hours. cheers!

Man state is right, you only need the starter if you already have an aftermarket ignition coil.

Yeah I know, Which is why I am going to remove the catalytic converter. We used to have open pipes here, But now rules changed and they won't allow anything except the stock exhaust. But we can still use a stock exhaust of another bike. Also, What do you think about the fuel consumption...

So beating the Supra on a drag race is not an issue with the gear ratio you suggested with the correct upgrades. But is this gear ratio good for daily driving? We don't have long roads here, about 2 Miles long with urban sharp twisties. Also, with the UMA Setup what do you think about the...

Thanks a lot for the detailed responses doc. Really appreciate it. So changing my gearbox sprocket/tranny to what you suggested and upgrading to what I mentioned in my earlier post, It should be enough to catch up with a supra right?

So Cylinder Head and Camshaft is where the optimization is at right? Also, I think the 6 Speed Transmission is also an advantage for the Supra. I know that It's asking a lot coming from a 4 Speed Auto clutch to beat a Dual Over Head Cam Supra which has crazy acceleration (I have ridden it, man...

No, I am asking for suggestions for the upgrades I would need. Right now, Everything is on stock.

Hi All, I currently own a 4-Speed Autoclutch SMX I'd like to know how much I would need modify to beat the new Honda 150CC Supra in a drag race. Can we beat it on these mods: 62mm bore big carb high lift cams big valve heads / port 'n polish Ignition Coil RCDI Irridium Spark Plugs...

Don't we still need the UMA Stater Motor if we are on bigger bore in order to E-Start?

Did you mean the UMA Racing Stator Motor? This one?

Best way is to buy Exciter/Sniper 5-Speed version Swing arm and buy the rear brake system of the same model. (Genuine). It's going to cost your for the OEM parts but believe me, I would never go for aftermarket brake systems, Especially rear. the reason is simple, your rear wheel will lock...