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Hey All,
After deciding to enjoy life a little more, I had my first go on hired MiniMoto in May. I found it hilarious and frightening at the same time. Been looking forward each week to go again. After a couple months and listening to everyones advice that having my own bike will really improve my learning compared to varying range of hire bikes, I decided to get one. I bought from track shop to avoid eBay Chinese fakes. For me my priority was to enjoy life and have some fun.

:( Sadly my first ride was not enjoyable. the clutch is late to engage and very snappy, it was quite a shock the change in power. I had 3 laps and exited. I made a new friend track side that told me how to lighten the clutch to engage earlier and at a lower rev. It was 1/3 a turn on each hex. It improved things but was still too snappy for my enjoyment. I got around the track a few more laps before closing time.

Next week I go around and have light spill after spill, my problem is, I'm not able to gently and slowly apply power during the bend while on the the exit while straightening up the bike. The power is still very much like a on/off switch and while on the lean tyre breaks grip (past 100%). I'm not carrying enough entrance speed to get around the corner on idle, as I am low on skill and confidence but I want to build up to it slowly and enjoy myself. It also doesn't help I can't warm the tyres up coz I'm spilling off.

The throttle twist is also quite short too, but I'm getting the knack for gently holding it where I need.
Until I complete eat sh*t into the tyre barrier on the corner after the straight. I really thought I broke my arm, my helmet visor broke and as I laid there coming to terms with the pain another rider comes around the straight and ploughs into me.

Thank F I had an automatic car coz I could not use my arm for 2 days and mu shoulder for month, I needed help from my new friends to get my bike off the track and into the car.
That was the first week of July nearly 2 months ago. My shoulder has been bad nearly the whole time, slowly getting better. But I'm approaching being ready to ride again.

But what the F do I do about my bike. Can I chill the clutch out or swap it (I'm handy with tools, I can fix cars and big bikes). Or should sell it and take a big loss and try to buy a weaker bike? (I was told engaging the clutch earlier might cause the bike to bog down on power, but right now I think that can only be a good thing for me)

All I know is its a GRC water cooled bike and I'm confident for a indoor track its too much of weapon for me. The name of the game is fun, and so far (I'm still on the first tank of fuel) I am not enjoying myself. (and getting really hurt)
Tire Wheel Automotive tire Light Motor vehicle
 

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What's your poison? Mine is 40:1
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I don't have much experience with the high horsepower bikes, but I would probably leave it as is and get a second lower horsepower bike, learn the track, then practice with the faster one.
However you did say the throttle pull was short, maybe there is some adjustment or a different throttle/cable to make it a longer pull and the power come on smoother.
A smaller pipe could tame the powerband as well. Maybe softer reeds as well.
 

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What is the model number on the bzm cylinder? It should be located on the base of the cylinder close to the carb intake side, or top of the engine. It looks like a 50cc motor and those things are no joke. I have been riding water cooled bikes for a while and I agree, the 50cc motor is for racing only. If you are looking for something more relaxed I would get a polini 4.2 or 6.2 motor. You can find a 4.2 pretty easily on facebook market place. Especially the group "mini motos, metrakits, CRFS, pitbikes" It looks to mostly be England riders. The polini and BZM motor mounts are the exact same and will bolt up to the chasis no problem. You will need to get the proper carb and exhaust for the smaller motor though. Chrisi on here can also help you out finding a good motor.

Its fun to have a spare fun motor and then a race motor when needed. Instead of 2 motors i just bought a smaller 40cc cylinder. And I'll swap the head if i need to. Its a little more work and i go through gaskets but ultimately cheaper.
 

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You could try going with a smaller sprocket. you'll lose a bit of bottom end, but it could make the bike more controllable. Just be prepared for faster entry speeds on long stretches or lower entry speed on short gaps.
 

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Also, what does your throttle look like? you probably have a quick turn. Useful once you are more comfortable on these bikes. Because they are literally just on or off the power. No easy going it.
 

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I was told it was 38cc engine but judging by the stamp I'm guessing its 36??
3T.36.06
36 is the cylinder diameter. With a stroke of 39mm it comes to 40cc. 3t meaning how many ports. You have a 6.2hp motor. Honestly probably my favorite size. If you think this bike is too snappy then you probably don't feel comfortable on the small frame of a pocket bike yet. I would almost suggest looking for a chinese cag bike. They are significantly slower but teach you how to handle a pocket bike really well. Then when you are more comfortable with cornering you'll find how enjoyable your grc bike is. What gearing are you running on that bike? It could be geared for high acceleration.

It sounds like a quick turn throttle. Those are typically the better throttles because they are better for your clutch life and its you don't need to turn your wrist so much to get on the power out of a corner. More just getting used to how pocket bikes are ridden. At what RPM does your clutch engage? For my 40cc bikes i try to get it to engage around 7500rpm. I feel thats easier on the clutch.
 

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36 is the cylinder diameter. With a stroke of 39mm it comes to 40cc. 3t meaning how many ports. You have a 6.2hp motor. Honestly probably my favorite size. If you think this bike is too snappy then you probably don't feel comfortable on the small frame of a pocket bike yet. I would almost suggest looking for a chinese cag bike. They are significantly slower but teach you how to handle a pocket bike really well. Then when you are more comfortable with cornering you'll find how enjoyable your grc bike is. What gearing are you running on that bike? It could be geared for high acceleration.

It sounds like a quick turn throttle. Those are typically the better throttles because they are better for your clutch life and its you don't need to turn your wrist so much to get on the power out of a corner. More just getting used to how pocket bikes are ridden. At what RPM does your clutch engage? For my 40cc bikes i try to get it to engage around 7500rpm. I feel thats easier on the clutch.
Why do you prefer 6.5 over others?
 

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Why do you prefer 6.5 over others?
I wouldn't say I prefer but rather think they are simply more fun to dink around on. Real fun around just a parking lot with some cones. They don't run as hot so they end up being less maintenance then the 50cc wc bikes. They don't destroy clutches as much. While I love the power of my 50cc motor, it has to be rode way aggressive or else it'll kick you off. Great for a race, not the best for a parking lot. And sadly there isn't a lot of racing happening around me anymore.
 

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That pocket bike is SUUUUUUUUUHHHWEEEEEEEEEET!


Hey just a suggestion.... when I first was riding on mine it was kinda alot.. like much more than I anticipated. BUT ABSOLUTELY EXCITING!!!! And I found a great solution my friend...


Change out your clutch springs to lighter ones. Lighter as in lower rpm engagement. It will be a smoother transition from 7k rpms hitting all at once to... 2.5k rpms.

Just a suggestion to each their own.
You'll probably have more clutch shoe usage but a better controlled machine. AND MORE ENJOYABLE!

Ps. If you choose to give up the hobby/sport just use it as a Coolio garage piece. Idk
 

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That pocket bike is SUUUUUUUUUHHHWEEEEEEEEEET!


Hey just a suggestion.... when I first was riding on mine it was kinda alot.. like much more than I anticipated. BUT ABSOLUTELY EXCITING!!!! And I found a great solution my friend...


Change out your clutch springs to lighter ones. Lighter as in lower rpm engagement. It will be a smoother transition from 7k rpms hitting all at once to... 2.5k rpms.

Just a suggestion to each their own.
You'll probably have more clutch shoe usage but a better controlled machine. AND MORE ENJOYABLE!

Ps. If you choose to give up the hobby/sport just use it as a Coolio garage piece. Idk
please dont keep it in your garage to rot, these bikes deserve owners who will use them imho
 
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