My daughter can only ride about ten minutes before her thumb is to sore.

I've read on here of people doing twist throttle conversions but am having trouble finding a throttle to use.

The stock bars are tapered down to 3/4 diameter. The aftermarket throttle assemblies I am finding are 7/8. I see some are swapping the bars to a 7/8 like a kx60 style, but I would like to locate a twist assembly for the 3/4.

My main reason for staying with the 3/4 is that it will provide much better throttle control with the small carb on the 50. A 7/8 assembly will "full pull" the carb in a very short distance. I'd like her to be able to ease into it as much as possible.

Does anyone know of a minibike using a 3/4 bar? I would think an oem setup may even come with a limeter screw for my youngest.

 

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As a suggestion, try contacting: http://www.hetrickracing.com/products.htm


Personally, I would NOT install a twist throttle on a mini. When using a twist throttle, the body is in a different posture. Thus, the young rider looses control. I know 3 mini-quad racers who have removed their previous twist throttles - after their kids crahsed 3 different times.

To reduce throttle fatigue, you may want to consider removing your Pred-50's oil injection system, going pre-mix at 32:1 (tweak it from there), and using a single throttle cable. We went premix (with single throttle cable) on our Pred-90 and immediately, the tension on our Pred-90 was reduced by 50%. Today, my son now keeps his eyes on the trail, instead of down at his sore thumb. Or, trying to reposition his hand / thumb all the time. Glad we went pre-mix on our mini. Should have removed its oil injection system on day one.

Hope this helps...

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50 % reduction huh.

That might be the answer. What was involved to disabble th injection? Just disconnect the cable or is there a bit more to it?

You recommend 32:1 on the pre mix. That seems rich. I am already having plug fouling problems. Would 50:1 be dangerously lean?

Thanks
Mud

 

1) Twist throttles are dangerous. I consider this the biggest mistake I ever made.
2) You mix the oil the way it is intended ie: amsoil is made for 50:1, most are not. 32:1 was good advice for most oils.
3) A LT80 throttle cable will replace the current cable that operates the slide and the oil inj.(approx 12 bux)

 

Do your self a favor like Spike said and do away with the oil injection and switch to a single throttle cable. we did this on my boys Polaris 90, what a diff. You solve 2 problems at once, We are running Klotz oil at 32:1 with Sunoco 104 octane race gas and a single cable i ordered direct from Terry Cable . Braided cover about 30 bucks. No i know its getting oil and the throttle is alot easier on Tylers thumb when he races.[img]i/expressions/face-icon-small-smile.gif[/img]

 

Mud_Runner,

To remove your oil injection system, check the instructions I just sent you via PM. The secret in reducing "thumb control" tension is installing a single throttle cable.

Start with 32:1 premix, stay with the same brand of oil and tweak the oil ratio until the plug becomes a beer bottle brown. As mentioned in many posts, oil ratios are different depending upon its brand and your unique riding conditions. 32:1 is a good start...

Hope this helps...

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Thanks everyone-

What a great source of info. [img]i/expressions/face-icon-small-smile.gif[/img]

I'm gonna order up a cable and make the conversion.

Spike99- Thanks for the PM

Mud

 

do your kid a favor and dont install a twist throttle!

 

I bought a plastic extension for my sons mini. It gives him more leverage, and puts the thumb in a more favorable position. I threw out the packaging, but I'll check the store I bought it from and re-post in a few days.

 

RAMTechRC,
I would like to get an extension for my son, where in the Valley did you buy it?
Partz