LESS TORQUE-MORE SPEED By triker (Read 962 times)

[triker]

I'm a brand new member.  I've got a 2014 (49cc) Ice Bear trike with a big bore kit (now 80cc).  Currently, it will only manage 35mph @ 9000rpm!  As it is now out of warranty, I'd like to know how involved (expensive) it would be to get 45mph out of it     

[Alleyoop]

Welcome Triker, I have to say with a 80cc bbk which is usually in reality 72cc's I would expect it to at least get to 40mph. Have you checked how high the belt is climbing on the Variator? Running at 9000 rpms is really not good, the GY6 motors make their max horsepower around 7500 rpms, anything over that is just a waste on motor really.
So lets first check how high the belt is climbing on the variator.
Weights may be to light cranking at 9000 rpms and the belt may not be climbing high enough on the variator.
So mark it like this and see how much of a mark is left after a speed run.

[triker]

Alleyoop Thanks for your response. Unfortunately, I don't know enough about the mechanics of the driveline to start exploratory surgery. What I think I understand is that there is an adjustment that can be made to trade some of that rpm for top end speed. Is there a video that addresses this issue? I'm hoping that with your help and others in this forum, I'll become more informed and capable of providing help along with requesting it. What I can provide right now for trike owners is my knowledge of utilizing the towing capability at an affordable price.

[Alleyoop]

What I suggested is very simple, all you need to do is take the CVT cover off and just get a marker and mark the Variator 1/2 by 1/2 inch on the edge put the Cover back on and ride like the wind then take the cover back off again and see how much of a mark is left on the variator:
Here is a pick of MY VARIATOR and the mark it left.

[triker]

Alleyoop OK  After I do this, can I get back to you with the results (pics) and  where to go from there?

[Alleyoop]

Here is a Video of someone with a 139QMB motor getting into the CVT.
Alleyoop

[triker]

After watching a few youtube vids, I got brave & disassembled the variator. I found flat spots on all 6 rollers. I re-assembled everything, marking the variator.  After a speed run and disassembly, I found that the top of the belt rides about 1/4" from the top.   First, I need to know what weight are the stock rollers in my 49cc icebear and where to buy a quality roller kit to dial in the top end. triker

[Alleyoop]

To find the gram of those you will have to weigh one of them, if you do not have a scale that can weigh in grams you can buy one a digital one at Harbor Freight they are under $10.00 or you can take a weight to your post office and ask them to weigh it so you know what gram weights are currently in there then you can go heavier or lighter.

The best quality weights are DR. PULLEY weights I find them to last longer and others will also verify that as well. It it due to the material they use to build them that makes the difference.
Alleyoop

[triker]

Happy 4th Alleyoop! My variator mark after a speed run looks about like yours (about 1/4" from the edge).  Do I want to get any closer than that? If not, what's the next step to get at least 10 mph more out of this low-end over-achiever? triker

[Alleyoop]

Now don't forget mine is a 115mm(4 1/2+ inchs in diameter) Variator which is almost 3/8 bigger than an OEM is 107mm(4 inchs in diameter)(. So My belt has climbed OVER 1/4 of an inch more which is a big difference. So if you have the OEM Variator and your 1/4+ from the edge you need a little more the mark left should be approx 1/8, if the mark left is 1/4+ you can do a little better. But to get 10more mph the cheapest is put in taller gears in the tranny to turn the wheel more times per. Other than that it will cost more for more displacement, free flow muffler/filter, up jetting etc..

The CVT tuned right with the right rpms will get you 3-4 more mph.
Alleyoop