HIAORS 428 17T 17mm Motorcycle Front Engine Sprocket for 50cc 70cc 110cc 125cc 140cc 160cc TaoTao Roketa Coolster Sunl Lifan Chinese ATV Quad Dirt Bike

Perfect fit for Boom Vader 125cc, no sprocket cover mod or new chain needed. Went right in. Speed before change 51mph, after 63mph very tucked and slightly down hill.Took less than ten minutes to put on.

Fits an Apollo Z20 125cc perfectly. Gained 7mph. Does take longer to climb through 3rd and 4th. 1st and 2nd are still peppy.

I got increased top speed for my boom vader.

This really improves speed i was at 40 mph and now 50 mph. It did fit a little loos the down side is it was bigger than i thought so i had to loose the chain a lot and take the engine cover off. I still really recomened it really improves. 4 out of 5 its a must

Definitely improves the bike’s performance. The 14 tooth front sprocket that came on the bike might’ve been useful for people who wanted to do wheelies, or start up a very steep incline with a passenger on the back, but I can’t think of anything else. I had to up shift into second gear at 6 miles/hour. Consequently, I never used it, even starting out from a stop up a fairly steep incline. I would just start out in second year. This larger sprocket makes first gear more useful. Also, the bike will go up to 35 mph (speedometer reading 45 mph) without coming close to red lining the tachometer. Yes, the speedometer on the Boom Vader 125 cc motorcycle reads 10 mph fast at 35 mph according to GPS (speedometer reads 45 mph).

Installed easy, well built and gave gtreat topend. I was looking for more topend and it delivered. Showed up fast an easy. Love the new ridability. Definitely recommend.

Does not fit with my ssr 70 so the functionality is not good but I’m pretty sure if this did fit it would be good value for your money

My fault for not looking further into the description. This does not fit the hawk 250 or any of its variants. The hawk250 takes a 20mm and this is a 17. Otherwise looked to be high quality.