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  1. #1
    oldchico's Avatar
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    Riva valve springs vs. stock & upgrading internals

    I'm looking for an opinion from some of 300x racing guys on the Riva valve train upgrade kit. Are these springs a worthy upgrade with added reliability in mind?

    I'm running the SCOM with pretty much all the bolt on stuff(plate, grate, exhaust, etc.) and the Solas 14/21. Ski has always ran like a champ and my maintenance is meticulous.

    After almost 60 hours on a typical day of riding I noticed I had suddenly consumed an abnormal amount of oil and I had lost some rpm's (went from 7600-7700 to about 7400). The ski still felt strong but I was down that 200 rpm on top. So, I recently decided to pull my head to investigate after getting some low compression and bad leak down results. All my valves, pistons and cylinder walls look okay(I think) without any signs of scarring or erosion and zero rust issues. But my leakdown test results on a cold engine showed 75% leakage across all 4 cylinders and it sounded like most was escaping the exhaust valves(nearly identical to FIRE's in his thread). I realize those numbers are probably inflated due to a cold engine, but its the sudden oil consumption and loss of rpm's that have me concerned (possibly a failing ring?). Even though things look decent at this point, I'd like to avoid any major problems down the road based on some similar threads on here. So I'm considering replacing the pistons, valves, and springs just to be done with it. I'm looking at the Riva valves, Riva springs, and a set of Wiseco 8.4:1 pistons. I'm just a little unsure if the springs are THAT much better than stock. Any opinions on these upgrades? I'm just looking to gain some longevity back with some better internals.

    Thanks in advance.

    Ryan
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  2. #2
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    APE has valves/springs/valve stem seals. Run them in mine 8500+rpm for 2 race seasons now with no problems if you're dead set on doing it, they have my recommendation

  3. #3
    oldchico's Avatar
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    Quote Originally Posted by Mike H View Post
    APE has valves/springs/valve stem seals. Run them in mine 8500+rpm for 2 race seasons now with no problems if you're dead set on doing it, they have my recommendation
    Thanks for the recommendation Mike. Are you running stock pistons?

  4. #4
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    some stock CR JE pistons.... i know at least one other person running them and havent heard any bad news about them

  5. #5
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    Ryan;

    Good chatting with you by e-mail.

    Jay

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