need advice on a bike

8 replies to this topic
  • adchrome

Posted 23 October 2009 - 11:19 AM

#1


My Grandson is 7 and will be 8 in Feb. so he has 1 year to race a 50 before going to a 65..

he is on a PW50 right now but its too small for him would like to acclimate him to a 65cc but its too big. he throws the PW around pretty well

I want to stay away from the KTM 50 if possible because of the maintainance involved in these bikes....its not that I can't maintain a bike, just hear its always something with the KTM 50

I am thinking a CRF50 might be a good way to go because he will have to get use to changing gears,I know it has the auto clutch but at least he will be able to get the Foot part down and think this may help when going to a 65 in a Year, The Tracks we race on have just Rolling jumps so not much airtime involved and have a 4 stroke 50 class

So question is am I right in thinking the Crf50 would help as a stepping stone to a 65 or is the Power of a Ktm 50 a better stepping stone, If I have to get a KTM I will...Actually I was ready to buy the KTM but after alot of research I am weighing options again

Thanks in advance guys

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  • adchrome

Posted 24 October 2009 - 10:39 PM

#2

Well ...Update..

Looked at the crf50 and it was just too small for him

I Found a Great deal on a King Cobra 50 today and Scooped it up, Fast little bike and really happy I went this route....was told today that my Grandson can run 2 years on this bike because he turns 8 after the 1st of next year and AMA goes from what age in Jan.

I had to lower it alittle to get his Feet on the ground but at least he will grow into it and not out of it...plus the Price I paid I can probably get back in 2 years when he moves up

I know I know, now the Work begins keepin this this thing Running......:thumbsup:

  • kx96

Posted 24 October 2009 - 11:24 PM

#3

adchrome said:

Well ...Update..

Looked at the crf50 and it was just too small for him

I Found a Great deal on a King Cobra 50 today and Scooped it up, Fast little bike and really happy I went this route....was told today that my Grandson can run 2 years on this bike because he turns 8 after the 1st of next year and AMA goes from what age in Jan.

I had to lower it alittle to get his Feet on the ground but at least he will grow into it and not out of it...plus the Price I paid I can probably get back in 2 years when he moves up

I know I know, now the Work begins keepin this this thing Running......:thumbsup:



change the air filter and oil often, dont leave the thing running to long or it will overheat, nad get earplugs cause those little 50s sound like shit

  • Wandell

Posted 25 October 2009 - 12:02 PM

#4

adchrome said:

Well ...Update..

Looked at the crf50 and it was just too small for him

I Found a Great deal on a King Cobra 50 today and Scooped it up, Fast little bike and really happy I went this route....was told today that my Grandson can run 2 years on this bike because he turns 8 after the 1st of next year and AMA goes from what age in Jan.

I had to lower it alittle to get his Feet on the ground but at least he will grow into it and not out of it...plus the Price I paid I can probably get back in 2 years when he moves up

I know I know, now the Work begins keepin this this thing Running......:thumbsup:
I was gonna suggest to look for a Cobra.:thumbsup:

  • adchrome

Posted 25 October 2009 - 09:11 PM

#5

how do I tame down the hit on the clutch....he is a Blipper and its like an on off switch....maybe I should go up on the front sprocket

  • bronc3

Posted 26 October 2009 - 07:43 AM

#6

Moving up from the PW, I opted for the CRF for my boy as I was more concerned with him learning to shift than I was with the power and suspension. He will probably stay awhile with the four stroke until moving to a 65. When he is ready for a 65 he will already know how to shift, he'll just need to master a clutch. I am going to try to avoid a KTM/Cobra/LEM if possible.

  • tmtex

Posted 26 October 2009 - 08:38 PM

#7

As others have said. Change oil/filter often. All info can be found www.cobratalk.com

  • NMdesertRacer

Posted 28 October 2009 - 02:50 PM

#8

Get a Tomar Clutch its around $400 but well worth it!

  • Smacaroni

Posted 29 October 2009 - 03:21 AM

#9

Before you drop a bunch of coin on a replacement clutch, sometimes you can modify how the clutch behaves by making minor changes to it's components.
If you're mechanically inclined, pull the clutch cover off, open it up and see how it works.
You may be able to make it engage sooner by increasing the number or mass of it's engagement system, using lighter springs or a similar method for much less than $400.
It's worth a shot.
There's really only two styles of clutches that I'm aware of with these, one is a centrifugal drum, it looks a lot like a drum brake. This type is very common in weed whackers, but you see them in motorcycles too. It uses springs to allow the partial engagement at a certain RPM and as the RPM increases, it engages more.
The other type looks a lot like your typical motorcycle wet clutch, multiple plates stacked together with ball bearings or other mass stationed in grooves in the basket to force the clutch plates together and springs to force them apart. As the RPM increases, large ball bearings are often used to force the clutch plates together. If there's open slots, you can add an even number of ball bearings to make it engage sooner or remove some to make it engage later. Be sure these stay evenly spaced, so if there's twelve slots, three filled followed by an empty space, repeated three more times for nine balls in 12 slots. If you want to remove three from this arrangement, it will now be ball/no-ball repeated five more times or six balls in 12 slots. To remove just one from the original nine, it's now going to be ball-ball-space repeated four times, for a total of eight balls. Adding one ball to the original set up, for 10 total, five balls followed by one space, repeated once.

If there's no open slots, you can't add any obviously, but you can find a denser material, such as wrought iron has a density of 7.75 grams per cubic centimeter, vs. "plain carbon steel" at 7.86 (what's likely to be in there) vs. stainless at 7.9. These seemingly minor changes would make a significant enough difference to make it worth looking into. Although SS ball bearings are going to be somewhat expensive since they're usually 1/2-3/4" diameter bearings.
Changing the springs is probably going to be more cost effective if you can't add any ball bearings, increasing the spring rate will make it engage later, decreasing it will make it engage sooner.

The third type I can envision, but have never seen, would be a dry clutch most likely, it would look a lot like your automobile standard pressure plate/single dual sided clutch disk set up. Only thing is it would have fingers that flip out to engage the clutch at a certain RPM. I can go into how I would make this behave differently, but I don't think anyone uses these, so I'm not going to. If you open the clutch cover and find one of these, just by the tomar, you'd spend a lot of time and effort changing this type of clutch's engagement RPM, it wouldn't be worth it in most cases.

You could just give him more seat time and see if he gets used to it, this is probably the route I'd take first.

My two cents.



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