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Post by rcq92130 on Feb 6, 2015 23:42:48 GMT -5
Thanks. Understand a little better now (never took the clutch apart and didn't know how it worked).
S a stiffer clutch main will give higher rpms.
Here is how my scoot works, which I don't get. Maybe it will make sense to you:
From start, with WOT all the way: rpm jumps to about 7300 or so. Super, great pickup.
At about 20 mph or so the RPMs have fallen to about 7,000. At all speeds above that the rpms stay at about 7k.
At no time do they reach 7500. Ever.
9gr sliders
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Post by geh3333 on Feb 6, 2015 23:56:38 GMT -5
Thanks. Understand a little better now (never took the clutch apart and didn't know how it worked). S a stiffer clutch main will give higher rpms. Here is how my scoot works, which I don't get. Maybe it will make sense to you: From start, with WOT all the way: rpm jumps to about 7300 or so. Super, great pickup. At about 20 mph or so the RPMs have fallen to about 7,000. At all speeds above that the rpms stay at about 7k. At no time do they reach 7500. Ever. 9gr sliders You have an abnormal situation. It makes sense that your rpms takeoff so high ",because of the light weights u r using". But why will they not pick up at top end ? Did this happen with 2 different cdi's ? How high is your belt climbing in the variator . and what final drive gears are you running ? |
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Post by rcq92130 on Feb 7, 2015 0:16:27 GMT -5
Everything from the belt back is OEM.
Yeah - CDI does not change this.
Thought of putting a shim back in the variator --- the thing came with 3 shims (I think all the same thickness), but no instructions. I have none in at the moment.
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Post by scooter on Feb 7, 2015 1:11:55 GMT -5
Everything from the belt back is OEM. Yeah - CDI does not change this. Thought of putting a shim back in the variator --- the thing came with 3 shims (I think all the same thickness), but no instructions. I have none in at the moment. You'll want to put a shim in with your "boss", to widen the variator a little. I may do the same. I have to see if my shims fit this new bike. All I have is .25 millimeter shims though, which is about .010". The shims for sale online come in sizes down to .004" for very fine tuning. My new variator is so hard on the engine that it shudders on takeoff. The old worn out one worked better. I got the same top end speed but with much smoother take off. Got the same results on two bikes with that same variator. It could be the manufacturer's angle was off by a fraction of a degree on the new one. |
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Post by geh3333 on Feb 7, 2015 2:01:03 GMT -5
Everything from the belt back is OEM. Yeah - CDI does not change this. Thought of putting a shim back in the variator --- the thing came with 3 shims (I think all the same thickness), but no instructions. I have none in at the moment. You'll want to put a shim in with your "boss", to widen the variator a little. I may do the same. I have to see if my shims fit this new bike. All I have is .25 millimeter shims though, which is about .010". The shims for sale online come in sizes down to .004" for very fine tuning. My new variator is so hard on the engine that it shudders on takeoff. The old worn out one worked better. I got the same top end speed but with much smoother take off. Got the same results on two bikes with that same variator. It could be the manufacturer's angle was off by a fraction of a degree on the new one. What variator do u have ? |
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Post by geh3333 on Feb 7, 2015 2:19:52 GMT -5
The shims may work ? You may be hitting the top of the variator too soon causing a hump in which u cannot over come. With the shims the belt will be lower in the variator causing the rpms to rise higher at top end. At this point you may over come the problem. Does your belt drop fully in the variator or not ? Can u post a pick of how high your belt is climbing at top end. It sounds like your belt is climbing way too fast , possible the clutch pulley opening too fast causing the belt to rise to the top of the variator too quick. Just lit going from first to 6th gear , the rpms will die and not rise fast if at all.
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Post by scooter on Feb 7, 2015 2:19:52 GMT -5
You'll want to put a shim in with your "boss", to widen the variator a little. I may do the same. I have to see if my shims fit this new bike. All I have is .25 millimeter shims though, which is about .010". The shims for sale online come in sizes down to .004" for very fine tuning. My new variator is so hard on the engine that it shudders on takeoff. The old worn out one worked better. I got the same top end speed but with much smoother take off. Got the same results on two bikes with that same variator. It could be the manufacturer's angle was off by a fraction of a degree on the new one. What variator do u have ? It's a 250cc variator from scrappydog. I don't know about a brand name. I also noticed there are machining marks on the pulleys from being turned on the lathe. Not all smooth and polished like my other variators I've had. Unless it was made that way for better grip, I'd say someone was in a hurry when they turned the pulleys. I can't imagine it's good for the belt. |
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Post by geh3333 on Feb 7, 2015 3:09:24 GMT -5
What variator do u have ? It's a 250cc variator from scrappydog. I don't know about a brand name. I also noticed there are machining marks on the pulleys from being turned on the lathe. Not all smooth and polished like my other variators I've had. Unless it was made that way for better grip, I'd say someone was in a hurry when they turned the pulleys. I can't imagine it's good for the belt. Wow , I also would magine the belt would ware out quicker if the variator face has machine marking on it. |
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Post by scooter on Feb 7, 2015 3:26:34 GMT -5
It's a 250cc variator from scrappydog. I don't know about a brand name. I also noticed there are machining marks on the pulleys from being turned on the lathe. Not all smooth and polished like my other variators I've had. Unless it was made that way for better grip, I'd say someone was in a hurry when they turned the pulleys. I can't imagine it's good for the belt. Wow , I also would magine the belt would ware out quicker if the variator face has machine marking on it. If I had a lathe I'd adjust the angle a little. It has plenty of "meat" on it and taking a few thousandths off of it wouldn't hurt it, IMO. |
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Post by geh3333 on Feb 7, 2015 3:28:28 GMT -5
I have a thread about my dad in the hospital . here is him singing in his band a few yrs ago . he was in his 50's
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Post by jerseyboy on Feb 7, 2015 9:45:31 GMT -5
I know alot of the guys on here like higher RPM,,but never able to come down below 6K rpm for cruising is not what I am after,,thats just a screamin chinese piece of grated cheese that will eventually mush apart IMO..lol
Anyway,,if I was on the track I would want to stay between 6-7.5K,,thats where the power is,,or so they say..mine pulls me 170lbs up the biggest of hills at 45 MPH with barley any throttle.
Hope it warms up a bit more today,,man I am dying to go for a rip roar...
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Post by geh3333 on Feb 7, 2015 10:10:44 GMT -5
I know alot of the guys on here like higher RPM,,but never able to come down below 6K rpm for cruising is not what I am after,,thats just a screamin chinese piece of grated cheese that will eventually mush apart IMO..lol Anyway,,if I was on the track I would want to stay between 6-7.5K,,thats where the power is,,or so they say..mine pulls me 170lbs up the biggest of hills at 45 MPH with barley any throttle. Hope it warms up a bit more today,,man I am dying to go for a rip roar... I have my scoot to top out on a straight run around 7500 rpms and 67mph , however I can cruise around 50 mph between 5500 and 6000 rpms. Probably closer to 6000 rpms .I def agree running these babies at higher rpms may cause some issues with them , possibly even a catastrophic failure. Luckily my engine has lasted within a few thousand miles of 20k. I'm ordering a new starter clutch since I'm pretty sure its the culprit causing the noise behind the stator. I saw a video of some on having noise coming from the same area and it turned out to be the starter clutch had pretty much broken , causing the internal peices to bounce around . |
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Post by jerseyboy on Feb 7, 2015 10:22:14 GMT -5
I know alot of the guys on here like higher RPM,,but never able to come down below 6K rpm for cruising is not what I am after,,thats just a screamin chinese piece of grated cheese that will eventually mush apart IMO..lol Anyway,,if I was on the track I would want to stay between 6-7.5K,,thats where the power is,,or so they say..mine pulls me 170lbs up the biggest of hills at 45 MPH with barley any throttle. Hope it warms up a bit more today,,man I am dying to go for a rip roar... I have my scoot to top out on a straight run around 7500 rpms and 67mph , however I can cruise around 50 mph between 5500 and 6000 rpms. Probably closer to 6000 rpms .I def agree running these babies at higher rpms may cause some issues with them , possibly even a catastrophic failure. Luckily my engine has lasted within a few thousand miles of 20k. I'm ordering a new starter clutch since I'm pretty sure its the culprit causing the noise behind the stator. I saw a video of some on having noise coming from the same area and it turned out to be the starter clutch had pretty much broken , causing the internal peices to bounce around . Well there is nothing wrong with cruising at 5500-6K at 50. When you tear into the motor to replace the starter clutch Im sure you will find something up in there,,hopefully you can fish out all the pieces if any fell off. |
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Post by JR on Feb 7, 2015 11:55:11 GMT -5
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Post by geh3333 on Feb 7, 2015 12:00:19 GMT -5
Thanks JR , its good to know we can have a disagreement and slight argument and still be civilized in the end . |
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