worntorn
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- Joined
- Dec 22, 2006
- Messages
- 7,575
I am thinking of installing the RGM 920 kit on my nearly stock 75 MK111 Interstate. Has anyone who has used this kit done a before and after dyno?
I searched and read several threads on this general topic, but those discussions centred around bikes that had been highly modified.
I'm hopeful that adding 11 percent to the displacement and leaving all else alone would give a gain of maybe 6 or 8 percent to horsepower and torque.
My MK 111 has the RH4 32 MM port size, so I suspect the ports are already big enough for a bit more displacement. Exhaust is standard crossover pipes with straight thru peashooters. Ignition is Boyer.
I would plan on setting the compression of the RGM KIT at around where the bike is now as stock, 8.5 to one, or at most sneak it up to nine to one.
I'm looking for power below 6,000 RPM, just the way the bike is now.
I searched and read several threads on this general topic, but those discussions centred around bikes that had been highly modified.
I'm hopeful that adding 11 percent to the displacement and leaving all else alone would give a gain of maybe 6 or 8 percent to horsepower and torque.
My MK 111 has the RH4 32 MM port size, so I suspect the ports are already big enough for a bit more displacement. Exhaust is standard crossover pipes with straight thru peashooters. Ignition is Boyer.
I would plan on setting the compression of the RGM KIT at around where the bike is now as stock, 8.5 to one, or at most sneak it up to nine to one.
I'm looking for power below 6,000 RPM, just the way the bike is now.