coachm
Scoot Member
All my friends have life goals, I just want to go faster
Posts: 24
Location: USA
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Post by coachm on Feb 27, 2019 17:26:33 GMT -5
Haha yeah, I have every mod possible thrown at this engine. Stroker crank, 52mm bore, taller gears, ported head with larger carb blah blah blah... I wanna help you reach that goal (and some hopefully!).^^^^ thank you ^^^^ I appreciate all the help. Look for my update later this evening with the compression test and boss length. We will get there (and some0. Here a the picture of the Boss and the Shaft. No compression test today. The kit I got off amazon didn’t arrive yet today. I have been reading the forums all day about the possible reason I am not getting the performance I would expect out of the scooter. My son weights 120lbs, I weigh 180lbs, he gets to 30-31mph on the scooter, I get to 29-30 max WOT. It takes both of us a long time to reach this max speed too. I am starting to think the issue is in the CVT tuning. Unfortunately, I have tapped out my budget for the month with the current upgrades but I am considering looking into a full CVT Naraku QMB139 Super Transmission Kit, Or Even going to the Dr.Pully HiT Clutch and matching Variator. I don't know enough about either to say for sure which if either would be better for our build. Opinions? CVT KITNaraku QMB139 Super Transmission Kit. Dr. Pulley HiT clutchDr. Pulley HiT clutch Dr. Pulley QMB139 Variator KitDr. Pulley QMB139 Variator Kit
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Post by dexameth on Feb 28, 2019 10:27:42 GMT -5
That all looks totally normal. I guess check the compression and report back. Remember to remove the carburetor from the intake completely to get a more accurate result. CVK carbs can get in the way of a true reading.
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Post by islandscrub on Feb 28, 2019 13:14:16 GMT -5
Does the rear clutch plate open smoothly and all the way? There's been instances where the center spring is too long and prevents the clutch from opening the full distance.
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Post by dexameth on Feb 28, 2019 13:52:43 GMT -5
Before thinking of purchasing any other clutch, I would disassemble yours again and inspect the torque driver. Make sure th ramps aren't obstructed and the pins can move all the way. Take off the clutch pack, then the spring, then see if the pulleys move smoothly all the way open and closed. If not, you will want to pull off the spring base (sometimes you need to pry it with a small flathead screwdriver) and inspect the ramps.
Being that kit was an eBay China kit, there's is the chance you got a wrong spring size and it is binding the clutch... all my thoughts lead to the clutch.
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coachm
Scoot Member
All my friends have life goals, I just want to go faster
Posts: 24
Location: USA
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Post by coachm on Feb 28, 2019 14:08:02 GMT -5
Before thinking of purchasing any other clutch, I would disassemble yours again and inspect the torque driver. Make sure th ramps aren't obstructed and the pins can move all the way. Take off the clutch pack, then the spring, then see if the pulleys move smoothly all the way open and closed. If not, you will want to pull off the spring base (sometimes you need to pry it with a small flathead screwdriver) and inspect the ramps. Being that kit was an eBay China kit, there's is the chance you got a wrong spring size and it is binding the clutch... all my thoughts lead to the clutch. I will disassemble the clutch this evening & even snap some pictures. I'll update later on what I find. thanks
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Post by islandscrub on Feb 28, 2019 14:52:14 GMT -5
If the plates move well and open all the way throw in the stock spring and see if you can top out at a higher speed.
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coachm
Scoot Member
All my friends have life goals, I just want to go faster
Posts: 24
Location: USA
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Post by coachm on Mar 1, 2019 8:23:58 GMT -5
Before thinking of purchasing any other clutch, I would disassemble yours again and inspect the torque driver. Make sure th ramps aren't obstructed and the pins can move all the way. Take off the clutch pack, then the spring, then see if the pulleys move smoothly all the way open and closed. If not, you will want to pull off the spring base (sometimes you need to pry it with a small flathead screwdriver) and inspect the ramps. Being that kit was an eBay China kit, there's is the chance you got a wrong spring size and it is binding the clutch... all my thoughts lead to the clutch. Not sure how much pressure it should take to open the clutch. It takes a lot of force to spread the pulley
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Post by dexameth on Mar 1, 2019 9:18:33 GMT -5
Not sure how much pressure it should take to open the clutch. It takes a lot of force to spread the pulley Do you mean the way it is pictured, with the clutch apart like that?
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coachm
Scoot Member
All my friends have life goals, I just want to go faster
Posts: 24
Location: USA
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Post by coachm on Mar 1, 2019 9:24:55 GMT -5
Not sure how much pressure it should take to open the clutch. It takes a lot of force to spread the pulley Do you mean the way it is pictured, with the clutch apart like that? No, I mean the pressure it takes to spread the pully not the clutch when assembled.
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Post by dexameth on Mar 1, 2019 9:51:39 GMT -5
coachm that is probably just the tension of contra spring you are feeling. Try the 2k Red spring, it's a PAIN! so with it all apart those pulleys can open and close freely? Try to preload, push against them and twist, it should try to open with no binding. Also, pull them apart completely and snap a pic of it like that.
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coachm
Scoot Member
All my friends have life goals, I just want to go faster
Posts: 24
Location: USA
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Post by coachm on Mar 1, 2019 9:54:40 GMT -5
coachm that is probably just the tension of contra spring you are feeling. Try the 2k Red spring, it's a PAIN! so with it all apart those pulleys can open and close freely? Try to preload, push against them and twist, it should try to open with no binding. Also, pull them apart completely and snap a pic of it like that. I'm not sure I understand what you mean by "Try to preload, push against them and twist, it should try to open with no binding. Also, pull them apart completely and snap a pic of it like that." I want to make sure I get it right.
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Post by dexameth on Mar 1, 2019 10:42:46 GMT -5
I'm just saying it should open and close smoothly. Holding each pulley half in each hand, pull open and push closed and try to feel binding or catching when it moves.
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coachm
Scoot Member
All my friends have life goals, I just want to go faster
Posts: 24
Location: USA
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Post by coachm on Mar 1, 2019 11:26:05 GMT -5
I'm just saying it should open and close smoothly. Holding each pulley half in each hand, pull open and push closed and try to feel binding or catching when it moves. It is almost impossible to pull open It takes a ton of force, and then pops closed, even making a sound
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Post by islandscrub on Mar 1, 2019 12:31:30 GMT -5
I'm just saying it should open and close smoothly. Holding each pulley half in each hand, pull open and push closed and try to feel binding or catching when it moves. It is almost impossible to pull open It takes a ton of force, and then pops closed, even making a sound Open and close the plates with the spring out to check for smoothness. If that's all good, go back to the stock spring and go for a ride, check top speed. In general you shouldn't have a center spring stronger than necessary because it puts a lot of strain on the belt.
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coachm
Scoot Member
All my friends have life goals, I just want to go faster
Posts: 24
Location: USA
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Post by coachm on Mar 3, 2019 22:38:57 GMT -5
Okay, I’m at a total loss now. Bike starts perfect, Idles perfectly, and drives without issue but it still tops out at 30-31mph.
Got a new “stock clutch” it opens more smoothly that the one that came with it.
I have tuned the Variator with 4g, 6g, & 8g rollers. I have even alternated combinations of each. The 4g rollers are actually getting the best result. Acceleration & highest top end speed.
BBK Engine (Good Compression) New intake & Carb (100 main jet) Air Filter Adjustable CDI box engine is showing just over 7000rpms on the stock rpm gauge. New Coil & Stock Coil seem identical in performance. Stock belt 1 mph faster than the slightly narrower Gate Kevlar belt. I have three different Variators & two different drive bosses. I shortened one of the drive bosses and ruined it because I made it too short. No Change in swapping the different (3) Variators.
How to +add 10mph more to this setup baffles me. I am running out of ideas. Average speed is between 26-29mph touching 30-31mph tops.
Help, Ideas??? -Adjusting the timing? -Changing fuel pump?
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