Bel-Ray Thumper Racing Full Synthetic 4-Stroke Motor Oil
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    Bel-Ray Thumper Racing Full Synthetic 4-Stroke Motor Oil

    Our price: $15.90$61.99

    MSRP: $21.49 - $80.19 - You save up to $18.20 (23% off)

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      Bel-Ray® Works Thumper® Racing Full Synthetic Ester 4T Engine Oil is a 4-stroke synthetic racing oil that has been developed for full works competition use and is designed to withstand extreme racing conditions. Full synthetic ester base oils withstand the highest temperatures and stresses which provide the ultimate 4-stroke motorcycle oil. Suitable for air-cooled/liquid-cooled 4-stroke engines and wet clutches. Meets API SM and JASO MA2 requirements.
    • For use in all 4-stroke engines with or without wet clutches.
    • Use in Thumper engines (single cylinder, multi-valve racing engines).

    Bel-Ray Thumper Racing Full Synthetic 4-Stroke Motor Oil Reviews

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    2 of 2 people found this review helpful.

    Bel-ray is all I ever used

    Comments On May 06, 2015:I ran Bel-Ray MC-1 in my 2 strokes and Had GREAT Results! less wear & longer times between re-rings & a piston would last all season, now that I have a Yamaha YZ 250F 4-Stroke I turn to Bel-rays Remarkable Lubes for its needs ,say what you want but Bel-Ray Thumper Racing Full Synthetic 4-Stroke is all I'll trust my Engine to. 5 STARS PLUS!!!

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    2 of 3 people found this review helpful.

    CR500 smooth

    Comments On Feb 26, 2013:This oil makes shifts smoother and more positive than with the Belray Gear saver. I run 10-40 in cooler weather and 10-50 in summer. Also works great in the CR250 just use the 10-40 year round.

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    3 of 3 people found this review helpful.

    I trust Bel-Ray

    Comments On Oct 30, 2012:I've always used Bel-Ray lubricants on all my bikes since I was a kid. I've never had any trouble with them.

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    1 of 1 people found this review helpful.

    works great

    Comments On Oct 05, 2012:Polaris outlaw 525S would not power shift using Motrex 10-50, went to this and now powershifts easy. Seems better

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    2 of 10 people found this review helpful.

    My bike does not like this it!

    Comments On Jun 29, 2012:Local shop was shut down and i needed to change oil, put bel ray in and rode. My bike made a lot more noise than usual, and it shifted horrible.

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    3 of 3 people found this review helpful.

    No problems

    Comments On May 30, 2012:Been running this oil in several 4 stroke machines with no problems. Doesn't seem to break down when I neglect an oil change like conventional oil did.

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    0 of 8 people found this review helpful.

    oil is oil?

    Comments On Apr 30, 2012:never used it but am told its good.been running silkolene,good stuff but pricey

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    4 of 5 people found this review helpful.

    Worth the price

    Comments On Mar 30, 2012:Great stuff, I run this in my 2005 KTM 400 exc; the owner's manual calls for the tough to find, 10W 50 full synthetic oil, but this is just right for my machine.
    The bottle is a little cumbersome to pour compared to other bottles, requires a funnel for most applications, but this isn't a big deal.

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