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Post by spreader on Feb 14, 2011 11:43:54 GMT -5
Hi Guys, need some info.
I have put another engine in my son's CPI gtr50, have refitted the basics to get it running just leaving the air-filter off. It started first time, but seems to be ticking over rather too fast and when I open the throttle the engine just dies.
Any help would be most appreciated.
Spreader
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Post by shakerdriver on Feb 14, 2011 12:19:23 GMT -5
sounds like your getting to much air, try putting the air box on it an try that.
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Post by spreader on Feb 17, 2011 13:17:01 GMT -5
Thanks for that shakerdriver, that did the trick.
Although the scoot does accelerate really slowly but then takes off eventually, I believe that could be the rollers being unsuitable?
What do you guys think?
Spreader
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Post by stepthrutuner on Feb 17, 2011 14:43:24 GMT -5
Try going down 1.5 or 2.0g. per roller and see if that suits you.
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Post by shakerdriver on Feb 17, 2011 20:08:16 GMT -5
either do what step said or change it to a little heavier contra spring, that'll keep it in the lower gears a little longer.
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Post by spreader on Feb 19, 2011 8:44:39 GMT -5
Thanks for the replies guys, have changed the rollers to a couple of different sizes, which did alter the performance as I expected, but the initial take-off is still very sluggish and there is a slight juddering noise at the same time felt through the steering, could that be something to do with the clutch or is it a carb set-up issue?
spreader
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Post by stepthrutuner on Feb 19, 2011 9:13:04 GMT -5
Have you played with the needle height in the carb? If you're perhaps speaking of the engine 'four-stroking' due to an overly rich mixture then idle mixture screw adjustment/needle height adjustment/idle jet size reduction may be in order. Otherwise, altering the clutch shoe engagement point with stiffer (one per shoe) 'pill' springs may aid launch characteristics.
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Post by spreader on Feb 19, 2011 9:24:30 GMT -5
I haven't played around with the carb at all as it seemed to be working ok pre- new engine, but it does feel like a clutch slipping/ judder to me, but sayin that this didn't occur before either.
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Post by spreader on Feb 19, 2011 12:32:07 GMT -5
Have lubricated the clutch spring and shoe springs, they seemed to be pretty stiff and it has done the trick. Although there is a bit of a lag at mid throttle which could be the carb set-up, performance is looking good.
On a further note what sort of revs would you expect to acheive for an ideal tick-over?
Thanks spreader
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Post by stepthrutuner on Feb 19, 2011 17:13:12 GMT -5
About 1800 rpm is a good idle speed. Most recommend 1600-1800 rpm.
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