Updated 4/2/22: Stock Counts have been updated! I do have 20 oem pumps on hand that are currently being modified to fill orders. I do ship internationally, if you see an error during payment, please send me a message.

Lightened Oil Spinner (2 Weights Available)

Lightened Oil Spinner (2 Weights Available)

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Only for 2013-2020 Groms(OG & SF)/MSX/Monkeys

These oil spinners lightened by Mike O’Connell will give you the option of tuning the weight on the crank of your Grom/MSX/Monkey. "Why would I want to do that?" Let me lay out all the current options with their pros and cons.

Stock (38oz) - Best wheelie pop but also the slowest reving option. Super stable idle.

Stage 1 (18oz) - Retains some weight for strong wheelie pop while still allowing faster reving, smooth idle and freeing up some power.

Stage 2 (9oz) - Sheads as much weight as possible for fast reving, only 3oz heavier than the kitaco clutch cover parts! Lightest/cheapest(WITH core charge) oil spinner option on the market!

Kitaco clutch cover (6oz) - removes the most weight and it the fastest reving option but also has the least wheelie pop. You will notice the motor is much easier to stall without the weight of the spinner to get you going.


Core Charge Policy -This part has a core charge option. That means that by choosing "with core" you are agreeing to send us your stock/undamaged part at your cost and realize we must inspect it before sending your new part out. If we determine, the part is too damaged to use as a core, you will be issued a refund minus return shipping costs for your part. If you are unsure if the part is "too damaged", please send pictures and ask. All unneeded core pieces will be shipped back with your new parts.

Address for core shipment:
Straight Up Pumps
P.O.Box 1805
Longmont, CO 80502