I got a great idea(so I think). I wonder if that CDI on the KFX90 is the same as the KFX50. What I mean is I wonder if the rev limit is different from the two quads. Could any of you 07 KFX90 owners possibly give me a part# off the CDI on your quads? Also how many wires with colors plug into it? Please!!!!

 

The KYMCO 90 part number is 30400-LBD4-900 and the 50 is 30400-LLJ1-900 if that helps...they are different from each other according to the parts diagram.

 

All, I found an exploded parts diagram here:

http://www.powersportseast.com...e_selec...i&year=2007


Select the belt converter diagram for the KFX90.

It looks like the spacer that needs to be removed is part # 92026A. Can anyone confirm?

 

I read your response on 4/28/2007 regarding removing the restrictor collar on the KFX90. My granddaughter was at the race at Glen-Helen this week-end and didn't want to race because everyone was passing her. Do you know the color wire in the control box that connects to the revlimiter? Your help would be appreciated and my granddaughter will be happy also.

 

Walter , if its a 2007 or newer model , there is no wire to cut. you are gonna have to remove the speed restricing collar(washer).

 

Ok , Im slowly making progess with this KFX50. I just installed a 28T rear sprocket(for a Kasea) and a 17T front sprocket . The hot wheels speed gun clocked my son @ 18MPH[img]i/expressions/face-icon-small-smile.gif[/img] I also removed the variator weights( the 6 rollers) and installed lighter ones . I also replaced the three rear clutch springs w/ 2000rpm(red) springs. That really helped with take off. I was gonna do the CDI swap with the KFX90 , but decided to replace parts that I know would work. I think the cheapest way for you KFX50/90 people to get more speed is to do a sprocket swap. You wont loose no low or high end torque(well you will, but nothing noticeable) because that little engine is dying to rock and roll!!!

Info: Stock variator weights: 8grams(ballpark figure) 6 total

carb: Keihin PTE16 , 85 MAIN JET. There is NO restricted parts on this carb. I removed and disassembled it. Also, dont bother buying a bigger carb , you will end up with the same results until they(mini quad gods) make a no rev CDI.

MAX RPM(KFX50): 8000RPM + OR - A COUPLE HUNDRED

Just some info I thought I would share. Also the Suzuki forum has some good info for their LTZ50. Yes they are having the same issues. Sorry to waste your time,hope you got something useful to use. Tim

 

Sorry , one last thing. BOLT PATTERN: 4/110

 

Thanks for your help, we got more top end now. What mods can we get for more speed? We put on a pipe and removed the reduction speed collar. Thanks Wally

 

I would definitely go out and get some gears. I run my sons bike with a 17T front and a 28T rear sprocket. That really helped put!!!

 

Airmobile101 Thanks for the information on the sprocket. Will the 17T and 28T work the same on my kfx90 as it did your kfx50 or should I go to different gear?