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Old 05-14-2009 | 08:57 PM
  #545  
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houston
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Joined: Sep 2004
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From: Sherwood,OR
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Originally Posted by BigNasty
Hey Monty
I hear you're coming down for nitrocross. Awesome. I got a tuning question for ya...

I got this GRP from a buddy of mine, sans carb... so I put a carb off my werks 7port on it. High end is awesome, ran last night at srs, 2 quals, main, practice... 220 degrees each time. My issue is this: low needle and the balance between the two. It runs great, but for some reason after refueling, if I don't pin it for a second, they'll throw it back down, it goes like 10 feet and stalls. Go to restart, and it's flooded. I leaned the bottom out, and it's 80% better. It's perfect all over the track, but at the end of the straight, i take a right hander and it's surging. real high idle speed for a min. Sofar, I've been going in the right direction, i think. Originally it had a rough idle, and we raised the idle stop to keep her going. I think it needs a little leaner low end yet. I leaned it out last night between heat 1 and 2 and it was much better, and dropped the idle stop a little. As I understand it, I keep leaning it out on the bottom a bit more and when it picks up again, drop the idle speed again? Really, it's running great, great power, and PRETTY MUCH reliable LOL... but i don't want it to die after I get pitted, especially if it's gonna be flooded. Last week it took 5 min to get it fired again. This week, it did it only once, and it fired in about 30 sec, so I think i'm headed in the right direction. sound right?

ps: I KNOW, JUST BUY A NOVAROSSI. I will be soon
i am pretty sure the os carbs work excellent on the grp engines . the grp engines tune like a vspec low end a little richer and hsn leaned out until it rips .



p.s. yes
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