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What's the thoughts on upgrading the factory Yamaha SVHO valve springs...
IMO i love the stage II+ IMUK 8550 tune. air intake, catch can, and a...
You can remove the rpm limiter and increase it as the ecu does have a top...
If all fails, it can be a bad ECU. We've seen this before with a P-1517...
Thanks very much!!
What's the thoughts on upgrading the factory Yamaha SVHO valve springs...
Valve springs and retainers