New Rider
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Joined: Mar 26, 2013 15:05:14 GMT -5
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Post by mattdel on Jun 23, 2013 18:28:34 GMT -5
Doing some tweaking to my ride while I suffer out the time of keeping it 49cc.
Currently the valves are at .003 and I'm getting an exhaust backfire on deceleration + valve slap over 7k rpm. I'd like to open them up a bit but not sure on where to put them for best performance to meet my needs, which brings me around to the sliders.
My current variator weights(rollers) have a few flat spots on them, which makes for a rather wobbly ride when there's a bit of resistance (up hill). They are 7G weights. My "problem" right now is that my RPM's are at about 8k when I'm doing roughly 30mph(I'm about 210lbs), and I'd like to rectify that without losing (hopefully gaining) up hill power. The real powerband of this engine feels like it's right in the 6.5-7K RPM range.
Can I go with a stiffer clutch spring to "beef up" my low range power and go to a heavier weight slider to sustain lower RPMs at higher speeds? I'm really trying to nail a perfect medium here and I'm not sure which combo of things will give it to me. Any suggestions?
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Post by lykos23 on Jun 23, 2013 19:30:49 GMT -5
A heavier "torque" spring should give you the torque you need to tackle those hills. Something like 1.5k. Dr. Pulley slider weights should give you higher top end, but too heavy of weights and you'll lose some speed. You're pretty right on what you've explained and it sounds like you know how to hit that power band. I suggest getting a variator weight tuning kit if you really want to play with weight combinations. Your valves can be set to .003 intake, .004 exhaust. Good luck getting answers to your other questions!
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Post by Deleted on Jun 23, 2013 19:41:05 GMT -5
They will tap at .003 and above
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