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Your cart is empty. Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets. Includes Forged piston, rings, clips and pin. Athena top-end gasket set includes required seals and hardware. Easy-to-follow step-by-step installation instructions. Most are bolt-on; no machining required except where noted.
2002-2004 fits YAM YJ50 Vino
2002-2005 fits YAM YJ50RA Vino Classic
2002-2005 fits YAM YW50 Zuma
2008-2011 fits YAM YW50 Zuma
Scott and Kaitlin Connolly
Reviewed in the United States on January 13, 2023
Increases overall cruising speed and provides better acceleration.
O'bummer
Reviewed in the United States on September 29, 2020
More power but.... You can't use the carbon reeds because they don't seal in the cage. It also does not come with the gasket and oring for the reed cage.But it does come with a large oring that isn't used on this engine lol
Jerome R
Reviewed in the United States on September 17, 2020
Unboxed piston and head looked a little alright there was a little bit of shaving didn’t think much of so installed the kit and it idled for 45 seconds and piston seized on me. Everything was oiled premixture was good. So I took back apart to investigate was wrong and the were more shaving and piston and head were completely destroyed.
Todd Devon
Reviewed in the United States on December 17, 2016
Great upgrade for moped, it will get your speedometer to break because it will make it go so fast. I had a yamaha zuma '01 and this increaed my top end from 37 to 46. Acceleration was increased tremendously. Pull back on the throttle and it gets so much more HP it will pop a wheelie if your not careful. Ive put on around 3,000 miles with this kit, and its running better than the original engine. Would recommend, however dont do what i did and dismantle your engine because you think you know what your doing. Had to watch alot of youtube to get this sucker bsck together. All in all, great addition and upgrade if your somewhat mechanicaly inclined. Best kit for the price.
VIRGILIO
Reviewed in the United States on October 24, 2016
installed on my 2009 zuma and works great without mod. works better after carburator accel mod.
rich
Reviewed in the United States on September 6, 2015
nice kit put about a 1000 miles on it sofar alot more power have to watch top speed now, installed with 90 main jet with stock carb, needle 1 clip position richer, 2002 yamaha zuma runs great
Brian Young
Reviewed in the United States on August 27, 2015
I purchased this kit for my 2005 Zuma 50 after the previous owner managed to melt the piston rings on the original motor in 1080 miles. Installation took a very reasonable amount of time, and because it's a 2-stroke, there's not much that one can mess up. The instructions are a bit dense for someone with no mechanical skill, but a quick search online of forums or YouTube makes installation a breeze.A couple notes: When you install the new top end, torque everything to spec, take a short ride, and check it. Also, break in with rides, not idling on the stand (remember its air cooled), making sure to vary the throttle. After a tank or two, you should be good to go! I've put 600 miles on mine since doing the swap a month ago, and it runs as well as stock Zumas.For reference, I have a 17.5mm Dellorto Carb with autochoke (running needle positions/jetting exactly as I pulled it out of the box from Team Calamari), a Leo Vince ZX exhaust, and the rollers/springs that were included with the ZX exhaust. I've gotten a GPS confirmed 50 MPH out of it with great acceleration, holding 35 MPH up some of the steeper hills in the Seattle area. I highly recommend this kit, but make sure that you retune your carb (or invest in a larger one) to prevent a lean condition that could cause premature wear.**Update** I've put over 1500 miles on this cylinder kit (longer than the original Yamaha) with zero issues. There has been no drop in performance over this time. I'm very impressed at the longevity and durability of this single-ringed cylinder.
Customer
Reviewed in the United States on January 3, 2013
10 more MPH and worth every cent. Easy to install and super stoked on the extra power. Don't forget new 90 jets, Athena Scooter Roller Kit 15mm D x 12mm L 5.6 Gram rollers and remember only swap out every other roller, 3 old, 3 new. Also, adjust your air fuel and idle screws. Finally I pulled the internal snorkel out of my breather box for 91 octane and my set up works great.Best bang for your buck to increase speed, torque and fun!
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