Raptor Forum banner

21 - 38 of 38 Posts

·
Registered
Joined
·
14 Posts
I have tried 3 different cdi boxes and have yet to find one that will work with the 90..Going to try one more before giving up on the no rev limiter box
 

·
Registered
Joined
·
14 Posts
We just finished 10 days of hard trail riding in the very North Woods with the raptor 90. The rev limiter was killing my son as he was constantly on it and limiting him.. I made my own Intake setup and polished the internal with uni pod filter, no longer has a stock air box. Then added a 22Vm mikuni carb and added a tooth to the front sprocket. The quad runs 10x better but the rev limiter needs to go bad and as of yesterday we need to rebuild the motor. Hopefully I can figure out a person who can modify the internals
 

·
Registered
Joined
·
14 Posts
Do you have an aftermarket cdi unit? if so from where.......and what can you tell it did compared to just removing the stock cdi jumper?? Thx
I have tried 2 different cdi units without any luck. Going to order one or 2 more to try hopefully one of them will work. Once I find one that does I will share
 

·
Registered
Joined
·
14 Posts
hey, could you please send me the links to the new front sprocket and carb you installed. thanks
The front sprocket can be found on eBay from a company who is making them. The carb can also be found in eBay which is a mikuni VM22. Both mods make a huge difference. I did order a separate air fuel mixture screw so it can be adjusted on the fly very easily
 

·
Registered
Joined
·
14 Posts
I build the setup myself. Did a little grinding and polishing removing casting marks on a few internals. The quad runs 10x better than stock but it hits the rev limiter way to fast. Still trying to find a new cdi setup that works. Have tried a few with no luck
 

·
Registered
Joined
·
14 Posts
I build the setup myself. Did a little grinding and polishing removing casting marks on a few internals. The quad runs 10x better than stock but it hits the rev limiter way to fast. Still trying to find a new cdi setup that works. Have tried a few with no luck
I might go 2 teeth more on the counter sprocket. See how it works compared to with the +1 I did now
 

·
Registered
Joined
·
4 Posts
Sorry i haven’t been on in a while, to answer the most recent question about jets in the stock carb, we ditched that carb and went to a mikuni vm 22, however after hours of tuning it an rejetting , these motors just don’t have enough low end air movement to correctly pull the fuel for idle and early part of needle circuit resulting in a lean bog, I just purchased a 20mm aft carb from tbparts.com and some jets to correct this issue.

The next question about stock cdi limiter, yes this was an issue, we went with a cheap after market eBay setup, one of the no rev limit deals, I recommend getting the one with adjustable timing as the timing curves are close but not exact to the stock cdi, VERY IMPORTANT- make sure the cdi you buy is a DC cdi box, do not buy a AC cdi box as it could damage your system. The 16-19’s are different than earlier models so don’t buy a cdi listed for one of these earlier models. We also increased the front sprocket size, going one tooth up in front is like going down three in the rear I believe, I would only go up one or two teeth in the front and see how that does. We only went up for one now but have clean up to a 17tooth front sprocket that I haven’t tried yet because you will need a longer chain and I’m waiting for ours to wear out.

We also have no chance of catching the top two dogs in My sons class as their apex 90’s are built to the moon and and honestly should have a class of their own, however 3rd through 7th place is a always good and fun battle to watch. FYI we are the only four stroke and the rest are two strokes. If the two stroke is a stock deal and your bike is properly setup you can beat them. All comes down to the rider as well.
Can you point me in the direction to buy a. Bigger front sprocket for a 2020 90
 

·
Registered
Joined
·
2 Posts
g'day, im new to raptor 90 (just got a 2021)

so can you use the TRX/Z50 V2 cylinder, head and cam?
looking to build a though 90/125? for local bush bashing.

looking at 20mm carb. 22mm seems overkill on the current head.
 
21 - 38 of 38 Posts
Top