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Post by magoconnor on Oct 21, 2019 10:17:27 GMT -5
Hello.
After breaking in my naraku 90cc kit with a Bvh, I have finaly started pushing it hard.
I can cruise at around 32mph with 5700rpms, with barely touching the throttle.
I can max out the gears on the bike, with the bike topping out at around 46 - 48 mph.
The problem is the rpms just keeps rising, the bike will rev over 10k with ease.
I have already installed some pretty heavy rollers, but the only thing I can really do,
other than upgrading the gears, is to go even heavier on the rollers.
Here is my cvt setup.
8.5 grams rollers naraku.
1000 rpm torque spring.
Malossi x belt
naraku half pulley.
I would really like to keep the rpms under 9500 rpms.
I could try odering some 9.5 or even 10 grams.
but I dont know if it would make a difference, it seems like i could install the variator with a dumbbell, and it would still over rev.
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Rune 75
Scoot Enthusiast
Posts: 441
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Post by Rune 75 on Oct 21, 2019 10:34:04 GMT -5
Heavier roller weights won't do anything to your rpm at top speed. The variator is already geared out before you reach top speed. Only solution is changing gears.
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Post by dexameth on Oct 21, 2019 14:51:28 GMT -5
The rollers only harness the RPMs until you get to full belt travel. After that is when you feel the engine start revving out. Meaning, say you put in 10g rollers you will have really low RPMs until the belt stops travelling then you'll notice a gain in RPMs.
I'd gear it. Also make sure you are getting full belt travel. Warning: Glixal (on Amazon) are known to not have the same cut angle as our engines with the 49/17 gears they sell. Avoid them.
Do you have specs on that belt, or a link to it? Width plays a HUGE roll in CVTs.
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Post by magoconnor on Oct 22, 2019 14:29:46 GMT -5
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Post by dexameth on Oct 23, 2019 9:29:53 GMT -5
Holy cow! That states 743x18x30... Normal long case 139QMB is 729 (723 for a restriction) and I've ran 738 with good results, but 743?? That's SUPER long! I almost wanna try that belt now haha
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Post by magoconnor on Oct 23, 2019 11:16:15 GMT -5
Yeah its a great belt, very durable compared to many others.
I been meaning to ask you tho, after seeing that you have installed an oil cooler.
Is it a pain changing oil now? and do you have to air out the system every time?
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Post by dexameth on Oct 23, 2019 14:09:07 GMT -5
Yeah its a great belt, very durable compared to many others. I been meaning to ask you tho, after seeing that you have installed an oil cooler. Is it a pain changing oil now? and do you have to air out the system every time? I haven't changed the oil yet, probably have like 10 rides at most with it and the way I see it is I'm not breaking anything in so no need for an early oil change. When I installed it, I did not pre-fill the system as I would have spilled it everywhere while installing. Those lines aren't the best at bending freely... but after the first ride I could feel the entire radiator was hot. This means it's doing it's job! I have noticed on a short ride that the bottom, or closer to the hoses, is warmer than the top. There could be air in this radiator, more than likely there is. My next test was to make a mess: pop the valve cover off and start up the engine (or turn flywheel with drill) and see if oil is squirting onto the rockers. If so, all is safe. I added 1 full liter of oil, which almost went to the top of the dipstick hole. I thought it would require more, but after a good ride I checked the level and it was the same. I believe the oil runs back to the crankcase after every ride and then pumps back thru the radiator after it fires up. Maybe I could pop a check-valve in the line right before the oil cooler to keep it filled. |
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