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Post by Lucass2T on Apr 23, 2017 1:49:05 GMT -5
Rich pilot, rich needle, but have the main jet dialled in. That's the best way to daily ride these hyper race motors Yeah but then it rides like shit because you have to keep throtteling the motor the whole time. I had that illusion too at one point in the beginning with the 70mph axis. Keep it rich everywhere besides the main jet. But its far from ideal for a daily because you're not going WOT the whole time. Id say just tune it correctly for every throttle position. Pilot, slide, needle, mj. Make sure its not too rich nowhere. |
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Post by spaz12 on Apr 23, 2017 1:54:51 GMT -5
Rich pilot, rich needle, but have the main jet dialled in. That's the best way to daily ride these hyper race motors Yeah but then it rides like shit because you have to keep throtteling the motor the whole time. I had that illusion too at one point in the beginning with the 70mph axis. Keep it rich everywhere besides the main jet. But its far from ideal for a daily because you're not going WOT the whole time. Id say just tune it correctly for every throttle position. Pilot, slide, needle, mj. Make sure its not too rich nowhere. I'm thinking that I have it set pretty good right now. Would feel a lot better if I had the EGT hooked up, but now that I know that I'm going to go with a bigger setup, I'm second guessing drilling a hole in this pipe for the probe. |
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Post by benji on Apr 23, 2017 2:03:58 GMT -5
Yeah but then it rides like shit because you have to keep throtteling the motor the whole time. I had that illusion too at one point in the beginning with the 70mph axis. Keep it rich everywhere besides the main jet. But its far from ideal for a daily because you're not going WOT the whole time. Id say just tune it correctly for every throttle position. Pilot, slide, needle, mj. Make sure its not too rich nowhere. this is the best idea to me. Running rich will just choke things up with carbon and oil. The only reason to run on the rich side is to compensate for a foam filter IMO, and those just don't seem to work well (I know, I run em haha.) |
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Post by PIG on Apr 23, 2017 3:24:46 GMT -5
Rich pilot, rich needle, but have the main jet dialled in. That's the best way to daily ride these hyper race motors Yeah but then it rides like shit because you have to keep throtteling the motor the whole time. I had that illusion too at one point in the beginning with the 70mph axis. Keep it rich everywhere besides the main jet. But its far from ideal for a daily because you're not going WOT the whole time. Id say just tune it correctly for every throttle position. Pilot, slide, needle, mj. Make sure its not too rich nowhere. I don't want to sound like an asshole or a know it all, but a 70mph race set up and full blown hyper race set up are completely different. I've had both and a mid race 70mph build can be tuned at all ranges of throttle pretty easy. A hyper race is a completely different animal. If you don't run it rich in the Pilot and needle range you will burn that cylinder down. The difference between a race cylinder and a true hyper race build is HUGE. Do whatever you want but I know how to keep a hyper race build alive on the streets. |
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Post by PIG on Apr 23, 2017 3:34:36 GMT -5
The thing with a hyper race is, it'll do 50mph at a quarter throttle. So if your riding it on the streets it has to be tuned fat. Cause a quarter throttle is still 10,000+ rpm. They have to be tuned for WOT and anything less is rich or you'll burn it down.
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Post by moofus02 on Apr 23, 2017 4:22:31 GMT -5
The thing with a hyper race is, it'll do 50mph at a quarter throttle. So if your riding it on the streets it has to be tuned fat. Cause a quarter throttle is still 10,000+ rpm. They have to be tuned for WOT and anything less is rich or you'll burn it down. I was following some links from 190mech. It was about race bikes and they were dead reliable wfo but because of part throttle revision they would melt down in seconds at part throttle unless pig rich on needle and pilot |
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Post by tsimi on Apr 23, 2017 5:19:38 GMT -5
PIG Interesting.... ...and what about keeping the jetting but changing premix ration from 32:1 to 40:1?
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Post by moofus02 on Apr 23, 2017 8:35:26 GMT -5
You might laugh but I run my race sleds@18:1. Goes through oil but the rings seal really good and I never have a problem that's oil related
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Post by benji on Apr 23, 2017 8:40:11 GMT -5
Keeping the jetting and going to less oil in the premix ratio should effectively richen the mixture. If you change your premix ratio, you gotta tune the carb a little. Maybe that's why there are problems down low? Too much oil in the mixture leaning it out, necessitating a rich condition in the lower rpm range for reliability?
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Post by 190mech on Apr 23, 2017 11:27:28 GMT -5
I think it is mostly due to max rpm pipe designs,,Jennings talks of it in his 2 stroke handbook,here is a graph from his book;  |
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Post by Lucass2T on Apr 23, 2017 12:51:30 GMT -5
Ah well. Spaz in the end only knows what works best for him. Egt and cht sensors would be some nice add-ons though.
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Post by spaz12 on Apr 23, 2017 14:21:46 GMT -5
PIG, You still want to buy this pipe? Do ya mind if I carve a hole in it? 
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Post by PIG on Apr 23, 2017 15:13:13 GMT -5
PIG, You still want to buy this pipe? Do ya mind if I carve a hole in it? What happened? |
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Post by 'O'Verse on Apr 23, 2017 15:15:05 GMT -5
A Perfect mix in all ranges of throttle. What's not to like? Worth a little air disturbance in a pricey expansion chamber. Hyper race cylinder, crank, and piston combos are worth far more than any hyper race pipe alone.  |
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Post by spaz12 on Apr 23, 2017 15:19:34 GMT -5
PIG , You still want to buy this pipe? Do ya mind if I carve a hole in it? What happened? I want to install the egt probe, but I gotsta put a hole in the pipe to do it. I'll have the bung welded on so that it can be plugged later with a screw in plug. |
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