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09-20-2019, 12:47 AM #16
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09-20-2019, 12:12 PM #176000 RPM
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09-22-2019, 01:36 PM #18
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09-22-2019, 02:38 PM #19Supporting Member
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You can buy an aluminum billet top ring from Mad EFI so that doesn't happen again. Its amazing how much a thru hub loads the motor down low. The direct inject (XS) motors make more torque down low and are not so fickle on propeller choice.
Glad you got it solved -
Joe
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09-22-2019, 04:29 PM #20
By sinking the reed block into the crankcase, you decrease the crankcase area by the volume the dressed reed block displaces. I would estimate between 15~20cc .
While at the same time increasing the plenum volume 4.5cc ..
Rubber coating was a quick and easy way to finish the blocks without machining and polishing a metal surface ...
Unfortunately , it tends to look like the desert floor after a while ..
And seals like ....
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mistah_max thanked for this post
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09-23-2019, 08:27 PM #21
initial test after i found the rubber ring was done alone with a 38 promax. takeoff wasnt perfect but it wasnt bad either.
But, the next day i went for a ride with the gf and i could barely get on plane with the 30 bravo 1 with 4 holes in it. took 4-5 seconds to pull up rpms and start slipping.. cant believe how much of a dog it is compared to a xs. once on plane it ran good. actually i ran my best speed of 93mph with a passenger with more left. but it definitely needs more holes to help on takeoff. and i need to find a 15in overhub prop for next year i think..1998 charger stv. 225 promax. -sold-
1993 22 talon. 2016 yamaha 200 SHO, nizpro tuned
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09-23-2019, 09:23 PM #22Supporting Member
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I typically run 4 blade over hubs on my stuff. The 300R is the solution. I guess we all need to wait until they start to come out on the used market.
Joe
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mistah_max liked this post
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