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Post by ryan_ott on May 23, 2016 20:05:34 GMT -5
Jet it rich and cool with fuel. If you still get good performance and run cooler go with it.
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Post by ryan_ott on May 23, 2016 20:08:38 GMT -5
FYI this was 460  |
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Post by 90GTVert on May 23, 2016 21:12:46 GMT -5
I agree with Ryan. See where you can get with a little extra fuel before you go too wild. I was just answering about the head work and may have lost sight of the reason you were asking about it before. If it's just hot and you aren't hearing knock when it's a reasonable temp, it's way easier to see what happens going up a couple of jets.
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Post by mauibird on May 23, 2016 21:18:31 GMT -5
I don't mind taking the head off again and grinding open the combustion chamber a little more to get lower compression. Then I could sand down the gasket area to lower my squish. Do you think 160 psi is too low on the compression?
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Post by mauibird on May 23, 2016 21:19:54 GMT -5
FYI this was 460 Thats crazy! my Arnada/Dio lives between 4 and 500… |
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Post by 90GTVert on May 23, 2016 21:24:02 GMT -5
I'd cc it all and do some math if I were gonna keep altering the head. Then you'd know where you're at to take a better guess at what to do next, plus you'd know about where you'd want combustion chamber volume once you settled on a target ratio. It's a pain, but actual compression ratio numbers may tell you more.
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Post by ryan_ott on May 23, 2016 21:24:28 GMT -5
Well the leaking head gasket didn't help! Those temps are insane.
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Post by mauibird on May 23, 2016 22:40:49 GMT -5
So I went up to a 58 pilot, a/f screw 1.5 turns out. Droped the clip one notch on the needle to the second notch from the top. Took her out. Temps stayed at 400 or lower but she was bogging at mid and wide open throttle. I could open her up all the way and she would drive through the bog then get on it. So I think I'm at the threshold of rich. I'm gonna raise the clip back to the top notch
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Post by mauibird on May 23, 2016 23:12:15 GMT -5
Clip back on the top notch. Now there is a slight bog a mid throttle, but it is livable. Went down to 7.5grams on the variator. The bike pulls hard. If I hold it wide open for a while it will sniff 500, but I can wrap the throttle and get it under 400 pretty quick. Top speed on this last test was 70mph. Looks like there is still some room left on the front variator for belt travel. Probaly 1/4 to a 1/3 inch left. Maybe I should try a stock torque spring…
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Post by mauibird on May 24, 2016 3:48:59 GMT -5
After thinking about it, I'm gonna remove the yellow Malossi plastic torque spring seat. It's actually like a little spacer, which might act as a preload on the spring, making it stiffer. I'm hoping a softer torque spring will allow the belt to travel all the way out on the front pulley, giving me a higher top speed. I hope. I'll take it off tomorrow, and test ride it Wednesday.
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Post by niz76 on May 24, 2016 11:10:44 GMT -5
Mauibird u seem like a talented fellow fabrication-wise. U might be interested in Brent's "homemade overrange" mod. My vari is the second one you see in the thread (Hoca Malossi clone) and I'm still running it 2 years later. Has awesome travel so you can use spacers and get best launch and also allows the vari to close all the way without breaking guides and pushes the belt to the very edge. Best of both worlds! 49ccscoot.proboards.com/thread/1227/homemade-overrange-variator |
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Post by mauibird on May 27, 2016 21:57:45 GMT -5
Ok, I tried several variations on the transmission. The yellow Malossi torque spring seat definitely acts as a preload making the spring stiffer. With the stock 49cc torque spring and the yellow spring seat the transmission would only go half way out on the variator. With out the spring seat it would cycle out as far as I could get it with any set up. It ran ok with the stock 49cc torque spring but it was better with the stage6, pink, over range, extra soft, torque spring. So I put the stage6 spring back on, and dialed the variator weights to my liking. With 7.5g weights, it pulled hard and topped out at 72. With 8g weights it pulled just about as hard and topped out at 75mph. So I stayed with the 8g weights. I'm happy with it for now. The Belt still has about a 1/4 inch of travel left on the variator. I don't know if I can get it to go any further, the transmissions feels tuned. Maybe I need a longer belt…? Mmmm Any ways, We have a run on sunday, Going around the West side of the island. I'll make a video, stay tuned…
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Post by niz76 on May 27, 2016 22:34:59 GMT -5
Daaammnn 75? That's rippin!
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Post by mauibird on May 27, 2016 22:39:16 GMT -5
Daaammnn 75? That's rippin! With out full travel of the Variator! I WANT MORE |
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Post by mauibird on May 27, 2016 23:11:50 GMT -5
Re-torqueing the Head and intake bolts. Had to take the spark plug out to take the cover off. Doesn't get much better than this.   |
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