trx90 aftermarket CDI benefits?

[unclebuck]

I put a Powroll 96 cc kit; 49.5 mm 9.5 to 1 piston, cam and exhaust on my grandkids otherwise stock trx90. I also opened up the air box and spent some time getting the jetting right. It's a dramatic upgrade but I'm wondering if I might further benefit from an aftermarket CDI and maybe an offset flywheel key. I'm new to the game, what sources are there for these parts?

Thanks

[Pappy]

we installed the aftermarket box on a stock engine with a full exhaust. it did seem to pull more in 3rd and 4th gear.


i understand that the offset key will make a big difference, but havent tried it personally.

[red rider88]

Idk i just cut the one wire but i forget which one it was

[Pappy]

Originally posted by red rider88
Idk i just cut the one wire but i forget which one it was

its the pink wire, and that was done to ours prior to the cdi installation

[ridesdirt]

I bought a cdi box from Robs (www.robbsracingengines.com)

It made a huge difference on my sons bike.

We had just installed a pipe and were a little dissapointed with the increase in power but the cdi really woke it up.

Now I have the big carb and copper head gasket. I installed the carb without blending the intake, it is ok. I plan on working on the intake and jetting. I still need to install the head gasket.

He can do doughnuts with the back tires spinning now!
We have turf tamers on the back.


Good luck, the 90 really does respond well to upgrades.

[unclebuck]

Thanks to all. I'll follow up with that link to Robs Racing.

[911]

Robs a great guy, runs our series. i'm also gona look into that cdi box. good luck

[red rider88]

Last year when i ran my trx90 charles at ic racing told me to save money and just cut the pink wire

[unclebuck]

I talked to Robb at Robbs Racing, he claims increased performance with his cdi box because of a change in the advance curve. That sounds like what I need, We ride primarily in the dunes where the grandkid never gets into the high rpm range in 4th gear anyway. Think I'll give it a whack.

unclebuck

[michmike420]

cdi did very little for me ,advance key helped.call charlie at McVay racing724-622-3514 he will send you in the right direction.they do only trx-90 work.