OptiFlo CR500 “phi” HV Impeller and Gasket Set Combo.

OptiFlo CR500 "phi" HV Impeller and Gasket Set Combo.
OptiFlo CR500 "phi" HV Impeller and Gasket Set Combo. - Image 2
OptiFlo CR500 "phi" HV Impeller and Gasket Set Combo. - Image 3
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For two-strokes, 104–122 °F coolant temp is the sweet spot for max power. Push past 140 °F and your CR500 is bleeding 1% horsepower for every degree hotter. This is where the MSV Racing CR500 High Flow Impeller shines. Proven to cool up to 20* better than the competition!

Part Number: MSV34
Replace OEM Part #:
19215-KA5-690, 19229-MAC-680

(46 customer reviews)

$119.99

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23 in stock (can be backordered)

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46 reviews for OptiFlo CR500 “phi” HV Impeller and Gasket Set Combo.

  1. Dylan S. (verified owner) –

    Excellent quality parts!

  2. Lee Wadsworth (verified owner) –

    Great parts, better than oem, Great fit highly recommended 👌

  3. Dan Eaton (verified owner) –

    High-quality

  4. Gary Janssen (verified owner) –

    I really like the how this mounts with the integrated thread and hex head.

  5. Daniel (verified owner) –

    New impeller quality is great, haven’t had a chance to see how much cooler motor temp is.

  6. Joe Miltenberger (verified owner) –

    Easy install definitely could tell she is running cooler

  7. marco parrini (verified owner) –

    Favolosa

  8. James Blogg (verified owner) –

    Looks great

  9. David B. (verified owner) –

    still have single track overheating problems with Rekluse clutch. I’ve adjusted for minimal slipping and try to ride at higher rpm.

    • Jason Meyer (store manager) –

      Did the MSV Racing impeller help with the overheating vs OEM impeller?

  10. Josh Martinson (verified owner) –

    Nice part. Fits perfectly

  11. Joshua B. (verified owner) –

    Excellent replacement piece for my 97 CR500.

  12. Donald Albring (verified owner) –

    Way better than stock

  13. Bruce Bonnefis (verified owner) –

    Very nice

  14. Kart Racer (store manager) –

    I installed the impeller and GEN II high flow elbow on my outlaw kart. Jason said most kart racers are seeing 10*f cooler with just the impeller and not sure what additional cooling the high flow elbow will provide. At the track I saw 20*f cooler running! We will now start leaning the jetting to pick up even more power.

  15. Ron J. (verified owner) –

    Super trick part, shame no one can see it due too water pump cover

    Image #1 from Ron J.
    Image #2 from Ron J.
    Image #3 from Ron J.

  16. PAUL FINNERTY (verified owner) –

    High quality product

  17. Julio Jose Garcia Garcia (verified owner) –

    Great product

  18. Jake S. (verified owner) –

    Very high quality part and fitment is excellent.

  19. Thomas Gosch (verified owner) –

    Easy install, had all required gaskets!

    Image #1 from Thomas Gosch

  20. steve killgore (verified owner) –

    👍

  21. Chris Harris (verified owner) –

    Worth every penny. My 500 AF conversion didn’t like the smaller 250r radiators. Installed this kit and now it doesn’t overflow a drop of coolant (even riding in Mojave). Wasn’t sent the gaskets by accident and owner promptly sent me out the gaskets as soon as I called in. Talk about a great product backed by great customer service! Would highly recommend!

  22. Christopher Menard (verified owner) –

    High quality

  23. Doug Prang (store manager) –

    Got the trifecta of exhaust flange, water pump impeller and case saver. Excellent products and could not be happier. What a class act this company is!

  24. Patrick Dayman (verified owner) –

    Part was shipped to my engine builder.

  25. Frank Homen (verified owner) –

    Can’t wait to try it out.

  26. Christopher Harris (verified owner) –

    Haven’t yet installed but holding the impeller I can tell it’s high quality! Super happy with product and can’t wait to cool down my 500!

  27. Orion Redmond (verified owner) –

    We installed this pump and a new radiator. Dropped 50 degrees.

  28. Walter Wiggins (verified owner) –

    Looks Great works even better, have on in my 01 CR500 this one going in 87 Cr 500

  29. Thomas Canellos (verified owner) –

    Design of the new impeller looks much more efficient than the original

  30. Jason S. (verified owner) –

    Quality Design * Highly Effective Circulation * 10 Degree Lower Running Temperature

  31. Kyle G. (verified owner) –

    Easy Install!!

  32. Hanicque Emmanuel (verified owner) –

    Good

  33. Christopher W Heikkila (verified owner) –

    Awesome product, love it, noticeable difference in cooling, I’m running 250 radiators on my 500 conversion. This impeller made the difference in cooling while riding it in soft sand, was getting hot, now it’s staying in comfortable heat range.

    Image #1 from Christopher W Heikkila
    Image #2 from Christopher W Heikkila

  34. Tom Iverson (verified owner) –

    So glad Jason made this product. It should keep my hillclimb motors nice and cool

    Image #1 from Tom Iverson

  35. Bill B. (verified owner) –

    easy to replace stock one

  36. Jason Kuta (verified owner) –

    Very nice well made product. Will purchase more products in the future.

    Image #1 from Jason Kuta

  37. Justin Burton (verified owner) –

    Awesome fit works as described

  38. Anonymous (verified owner) –

    performance upgrade

  39. Joseph Holzer (verified owner) –

    Looks like a good quality and no longer overheating my 500

  40. George Johnson (verified owner) –

    Top quality

  41. Paul Edmonds (verified owner) –

    Impressive

    Image #1 from Paul Edmonds

  42. Anonymous (verified owner) –

    Great product noticeable improvement as listed

  43. paul hoffman (verified owner) –

    This impeller will make trail riding my CR500r so much nicer w/o having to be at Plus size RPM’s for cooling. It is not only well engineered but has been tested on the bench & road to prove it’s significant benefits.

  44. Nick Swan (verified owner) –

    A must have upgrade for anyone planning to race their CR500. My 1985 CR500 had the common water pump corrosion issue so I used to opportunity to upgrade the impeller since the original impeller was unusable. Noticed cooler temps and also felt like the motor gain some extra power.

  45. Billy Brown –

    Fantastic fit and finish. Easy install. This guy does great work to improve the sore spots on our beloved big bores.

  46. Chad Waletzko –

    Highly recommend for your cr500 build it makes your bike run cooler if run thr sand dunes or trail ride this what you need i ride alot of dunes good product to help keep my bike cool

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