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Post by Elektrey on Jul 4, 2015 12:48:40 GMT -5
thats about 99 psi, kind of low.
you probably will get more power from that unused cylinder and piston
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Post by alentje on Jul 4, 2015 18:19:38 GMT -5
Is there any way i could go 90km/h with my setup + 17.5 or 19mm carb?
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Post by alentje on Jul 4, 2015 18:38:08 GMT -5
+ stock cylinder
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Post by Elektrey on Jul 4, 2015 18:52:12 GMT -5
with a pipe, Possibly with some port work and tuning everything else?
80km/hr more likely
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Post by fe53series3 on Jul 4, 2015 21:50:30 GMT -5
with a pipe, Possibly with some port work and tuning everything else? 80km/hr more likely I have to agree with Elektrey....... scoot engines are not designed (at the outset) for maximum power capabilities. My AM6 is tuned for 100kph. It could be tuned for 115kph, but I'd lose its current rideability. So engine power can clearly be increased, but you'll need a cylinder kit with different ports, and an exhaust and fuel/air, to match the porting. |
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Post by alentje on Jul 5, 2015 5:54:51 GMT -5
But my engine goes 80 with a sports pipe alone.
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Post by alentje on Jul 5, 2015 6:14:24 GMT -5
Soo, probably best idea for me is to leave this as-is until it dies completely, just with a downside of low compression where i lose my low end power. It goes 85km/h on gps with a 12mm carb, not setup right
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Post by fe53series3 on Jul 5, 2015 11:27:57 GMT -5
Soo, probably best idea for me is to leave this as-is until it dies completely, just with a downside of low compression where i lose my low end power. It goes 85km/h on gps with a 12mm carb, not setup right That's great. I was thinking more of 100kph+ However, you must be honest with yourself when assessing performance. In your previous post you said 80.... in your next post you said 85. It's a big difference - around 6.5%, which may require around 10% more power output. Every extra 5kph gets much harder to achieve. .... but for sure you are gonna get more power with a bigger Dellorto carb setup. You certainly can't get much worse than a 12mm Gurtner. Why not go for it.... and have some fun learning to tune it up  |
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Post by alentje on Jul 5, 2015 12:47:48 GMT -5
Soo, probably best idea for me is to leave this as-is until it dies completely, just with a downside of low compression where i lose my low end power. It goes 85km/h on gps with a 12mm carb, not setup right That's great. I was thinking more of 100kph+ However, you must be honest with yourself when assessing performance. In your previous post you said 80.... in your next post you said 85. It's a big difference - around 6.5%, which may require around 10% more power output. Every extra 5kph gets much harder to achieve. .... but for sure you are gonna get more power with a bigger Dellorto carb setup. You certainly can't get much worse than a 12mm Gurtner. Why not go for it.... and have some fun learning to tune it up About the 80km/h i said, that's the top speed achived with a COMPLETELY stock speedy with a sports pipe properly setup! |
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Post by alentje on Jul 7, 2015 17:11:10 GMT -5
So I installed a brand new stock piston and cylinder and immediately i felt the takeoff speed. Everything is ok but the power band has shifted waaay too much on low rpms. So, takeoff is great, just my springs a bit stiff, but as soon as it takes off it doesn't have the "pull" anymore, the acceleration is worse then the sport cylinder. Also i get better acceleration on less than half throttle then on WOT. I think as the power band shifted, i need to get heavier rollers to keep the rpms in the powerband to get bettet acceleration.
What do you guys think?
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Post by alentje on Jul 15, 2015 7:27:28 GMT -5
There is no way of setting this up correctly. I tried all jets from 80-90 with stock filter and it doesnt want to run correctly. All it does is start but only with full throttle and then it wont rev, it only makes like 3k revs on full throttle, and as soon as you let the throttle a bit it stalls
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Post by 90GTVert on Jul 15, 2015 8:03:07 GMT -5
What changed between the last post when it was running pretty well till now when it won't run well?
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Post by alentje on Jul 15, 2015 8:55:11 GMT -5
It works fine with an open filter apart from the 1 sec lag, bit as soon as i install this stock airbox with brand new element it does this it wont rev just like idling on full throttle
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Post by 90GTVert on Jul 15, 2015 18:15:25 GMT -5
To me it sounds like it may be running very rich with the stock filter and a little lean or lean part throttle/needle settings with the open filter.
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Post by fe53series3 on Jul 17, 2015 19:15:34 GMT -5
It works fine with an open filter apart from the 1 sec lag, bit as soon as i install this stock airbox with brand new element it does this it wont rev just like idling on full throttle Sounds to me like something is wrong. You stated that you've tested from 80 - 90 main jet, yet it still won't run. Going from airbox filter to 'no filter at all' will be around 4 - 6 points, depending on how accurately you were tuned in the first place. You need to refer back to your previous setup, when you were able to hit 85km/h with a 12mm carb. What exactly have you changed? |
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