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Your cart is empty. Fit for 56mm Bore YX 140cc Horizontal Engine (1P56YMJ ) 56mm Bore YX150cc Horizontal Engine (1P56FMJ-5 ) PITSTERPRO GPX, PIRANHA, SSR, Thumpstar, 141BBK 140CC, 150CC DIRT PITBIKES
Original factory parts A complete YX140 cylinder head assembly fit with Z40 decompress camshafts , strong valve springs and sprocket.
Darryl Givens
Reviewed in the United States on July 27, 2022
Definitely gave a noticeable increase in power over the stock 125cc head for my 141bbk on my grom clone.
Brendan
Reviewed in the United States on July 17, 2022
As advertised except there are no steel valve spring seats installed. Watch out. Valve spring will eat right thru the aluminum head.
Dj
Reviewed in the United States on November 28, 2022
Piece of the fin fell out of the box when opening. Cam was moving around so I opened the cam gear cover to look at it. Found the cam gear cover bolt bent, the cam bearings won’t hold in place, rocker shafts fell out, and cam gear is loose.
jun molina
Reviewed in the United States on November 22, 2022
Works well with 141BBK kit. No issues so far
JD P Watkins
Reviewed in the United States on April 27, 2022
❤️🤘🏽💯💥
Rsandy2
Reviewed in the United States on February 17, 2021
Everything came in package as shown... However, the cam shaft wasn't in place, probably due to shipping. For the beginner who doesn't know much of anything I'd suggest informing buyers to make sure all moving parts are correctly in place before assembly. I inspected all moving parts and noticed cam shaft was out of place. Having said that, it does work fine, and it gives my daughter's bike a little more power.
DJ
Reviewed in the United States on January 29, 2021
it came with missing bolts like the bolts for the oil cooler and no bolts for the timing rods cover. but over all decent product. also fits great on kymco k-pipe 125
Stratovarious
Reviewed in the United States on November 21, 2019
I installed this head, and new piston as my pit bike (2018 Thumpstar 140cc) was smokinglike a fiend, horribly, and running terribly. The actual problem I determine to be thepiston rings. I may not have actually needed a new head, but this head works fantastic,and it is possible that it's better than what I had, could also be identical, sure looksthe same.I have the valves set at .003 intake and .005 exhaust. I tried different clearances butthis is oem spec for the bike and seems to work well.I'll for sure be buying again from this seller next time I need a new head and valve set.
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