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 My 155 BBK thoughts 
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Post My 155 BBK thoughts
HOLY stool!!!!! :awesome: :wth: :toot: :haw: :eng101:


I bought the kit from Race Concepts and it is pure joy. The biggest difference is it keeps pulling from 30-60mph. I have done no other performance mods. I may add a little taller gearing to get me over 60mph in the future. If you are on the fence on whether to upgrade, BUY IT!


Tue Jul 11, 2017 6:51 am
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Post Re: My 155 BBK thoughts
I sent you a personal email asking this question, but I am not sure it went through, so I will ask, again, here.

So what did this setup do to your performance below 30 MPH? Is your performance below 30 MPH better/worse/unchanged?



chuddybangbang wrote:
HOLY stool!!!!! :awesome: :wth: :toot: :haw: :eng101:


I bought the kit from Race Concepts and it is pure joy. The biggest difference is it keeps pulling from 30-60mph. I have done no other performance mods. I may add a little taller gearing to get me over 60mph in the future. If you are on the fence on whether to upgrade, BUY IT!

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2015 Zuma 125

CHASSIS: Dual headlight Mod plus modulator. KOSO Afterburner taillight plus modulator. Louder horn. GPS. Rear rack. Seat Mod. Smoked turn signal covers. Michelin City Grip tires. Folding mirrors. 260mm front brake rotor. GJMS rear shocks.
ENGINE: Simoto intake filter. Lightweight fan. NCY Exhaust. Taida finned valve & cam covers. 155 BBK (with bigger cam and injector)
TRANSMISSION: TST Variator (9 & 10 gram weights). KOSO lightweight Clutch Bell. NCY contra spring bearing. 1000 RPM contra spring. KOSO CVT cover.


Thu Jul 27, 2017 6:18 pm
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Post Re: My 155 BBK thoughts
1500 rpm spring light rollers, 8g and 9 g rollers, will make 1 to 30 mph feel like a real motorcycle out of the pocket. Is how the performance for a 155 bbk feels at 1 to 30 mph. keep stock final drive gearing in there and you will pull the front off the ground if it has no stretch. ( depending upon your body weight )

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Fri Jul 28, 2017 6:02 am
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Post Re: My 155 BBK thoughts
Yep performance is also better at low speeds. It will barely pull the front wheel off the ground on take off (I weight 200lbs). It's just the increased performance is more noticeable after 30 mph compared to stock.


Tue Aug 01, 2017 11:42 am
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Post Re: My 155 BBK thoughts
If you want it to really pull consider a TST 2 stage variator with 9/11g weights from RC.


Mon Aug 07, 2017 12:44 pm
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Post Re: My 155 BBK thoughts
Why did you have to say that John? Now I feel like I need a TST variator........ :mario:


Tue Aug 08, 2017 8:02 am
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Post Re: My 155 BBK thoughts
thanks for the support!

1st thing you have to get is a aftermarket clutch and clutch bell. with more power the stock one slips. this alone will add performance and increase top speed. eliminate slip and all the power goes to the rear tires. PG clutch and bell combo is a solid choice since it's a heavy unit so it's smooth and built to last forever (carbide steel clutch bell) had a customer do a burn out and wasted the clutch pads, then melted the aluminuim clutch onto the PG clutch bell. normally any clutch bell u toss it away but PG is carbide steel it survived. cleaned it up and installed a new clutch.

2nd item be the rc cvt kit with the TST variator, changes the way it shifts and adds acceleration. large diameter variator increases top speed.

if you plan to ride pass 65mph often then i would also get the aluminium rear torque driver. does not have that fat weld spot found in steel versions. so does not flip the belt or chew it up at high speeds.

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Sat Aug 12, 2017 4:12 pm
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Post Re: My 155 BBK thoughts
Reading through these posts and just had to comment. My scoot has a cheap 155 kit with whatever cam came with it, larger injector, upgeared the rear, 12 g Dr. Pulley sliders. Stock everything else. Pulled hard and pegs the needle past 70 on a good day.
I recently came across a good deal on a Two Bros pipe with a juice box, bought and installed. Wow! It runs way better. Wish I still worked at the dragstrip so I could measure how much better, but it's a ton.
Everything has 24,000 miles on it, except the sliders and belt, sliders have 20,000 on them, and I put a Yamaha belt on at 12,000 just as maintenance.

No aftermarket variator, or clutch, etc. My biggest problem now is going through back tires, (not trying to).
I have not seen the drivetrain for 12,000 miles and am getting curious as to what stuff looks like, so I may get some 9g sliders as an excuse to pull it apart. But reading all this stuff about clutches and variators makes me wish there was an eyeroll emo.

Btw......live at 10' altitude and weigh 150.


Mon Dec 04, 2017 7:52 pm
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Post Re: My 155 BBK thoughts
the tst variator is about $100 and it will improve your " gear shifting" if you are about to take the cvt appart and maintain it, If it were me, i would put on the cvt system because it will " shift" differently then the stock one. it has two different degree angled ramps for the rollers to generate a high and a low end " shift" .... then do the sharpie test to see where the belt rides on the variator at max speed. dial in the rollers and the shims and you are all set. best of luck.

lambo

tst cvt https://www.rcscooters.com/_p/prd2/9581 ... rc-cvt-kit

you weighing 150 lbs! is perfect to if you jump up to a 12/39 gearing ratio... more top end!

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Tue Dec 05, 2017 10:26 am
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Post Re: My 155 BBK thoughts
Lamb.............my gear is a 12/39 and I have pegged the needle down past 70. I need to make sure my tires are properly speed rated!

I am looking to do a stroker crank.............not for the 10cc, but thinking the rod angle may produce more torque? Any consensus on that?


Thu Dec 07, 2017 4:51 am
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Post Re: My 155 BBK thoughts
wheels, i think there are only 1 or 2 " real " speed rated tires out there that are set for over a true 90mph rating. I know the Pirelli Diablo Scooter Tire which is 60$ a tire... is over 90 mph rated..... but I have had my bike up over 75 and i dont feel any different with my Michelin Power Pure SC 130/70-12 Rear Tires which were $50 a pop. I have a 164cc and i weight 220 lbs. its just fast and shady.

lets say you do find " proper" tires... you do realize they dont properly balance those rims? I know people in taiwan who take there bikes up over 100 mph with turbos and 200cc's ... so I think whatever tire you shoot for will be fine if you are only hitting 70 mph ish...

the diablo tires : P-rated for speeds up to 93 mph, S-rated for speeds up to 112 mph or H-rated for speeds up to 130 mph

the crank... I dont know enough about " tech talk" regarding a crank. I know Chris with rc scooters could talk your ear off regarding that. He knows all the weights, principles, and what will work for what you are trying to do. I would say contact him. I have an aftermarket crank and I have been fine with it. I am the guy who gets what im told to get, put it in and drive. :) Chis is the guy who knows what works.

Chirs is probably going to tell you to get the tst variator first, for starters to get a handle on your search for torque. but you better contact him to hear it from the horses mouth. if you are running a 155cc engine and have the stock variator on there... you are missing spots where you can pick up on performance. I know that much. those rollers are 12g's each at 6 rollers weighing in at a total of 72 g .... a typical 155 runs around 60g total rollers. but with your light burro... you might be able to run with lighter rollers and pick up on even more speed and torque. those are my two cents. I wish, sometimes i was 150 lbs.... the speed i would get on my bike.... shhhhhh, just let me dream...


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Thu Dec 07, 2017 2:50 pm
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Post Re: My 155 BBK thoughts
dragstart wrote:
Lamb.............my gear is a 12/39 and I have pegged the needle down past 70. I need to make sure my tires are properly speed rated!

I am looking to do a stroker crank.............not for the 10cc, but thinking the rod angle may produce more torque? Any consensus on that?


the RC 3.2 stroker crank improves performance in couple way.

1st. the stroke is increased and this gives more leverage.

2nd crank is heavier and more mass on the counter weight. holds speed better with less throttle needed. increase power by 1hp and broader wider torque curve.

draw back with stroker crank is you also need a high torque starter.

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Thu Dec 07, 2017 11:22 pm
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Post Re: My 155 BBK thoughts
Chris.......what cc does the 66 mm bbk come out to be with stock crank? And the 2.5 stroker?


Fri Dec 08, 2017 6:01 pm
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Post Re: My 155 BBK thoughts
Chris................I guess I meant 3.2 stroker. CCs with 66 and 3.2?


Sun Dec 10, 2017 5:25 am
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Post Re: My 155 BBK thoughts
contact him on facebook.

https://www.facebook.com/RCscooters

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Mon Dec 11, 2017 7:15 am
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