|
2018 KLX 250 EFI 331 Big Bore questions
Hi everyone, first post on here but I've been reading since I bought the bike in the spring. I'm almost ready to place my order for a 331 big bore kit but I want to make sure I'm not missing anything. So far this is what I'm getting:
Either Bill Blue or Kustom Kraft 331cc big bore kit (not sure which one to get, Bill Blue is much cheaper). FMF Q4 + 1-1/8 Quiet Core insert (I want to keep the noise to a minimum) FMF Powerbomb EJK Fuel Controller KDX200 Snorkel Questions: 1. Is there an advantage with the Kustom Kraft kit? I know it comes with a new cylinder but there's a pretty significant price difference. I'm in east coast New-Brunswick Canada, so that means US-CAN exchange and duty fees on top of the shipping charges. 2. Is anyone keeping their stock cylinder as a back-up in case the upgrade doesn't work or fails down the line? 3. The big bore version of the EJK is for s 300cc, does this cause a problem with the 331cc? I'm guessing it will require different settings. 4. I would rather go with the 351cc kit but from what I understand there are fuel issues with the 351 and EFI. 5. How restrictive is the stock air filter? Is there any point in replacing it? I'm reading that the K&N is less restrictive but allows some dust to pass through. 6. Is there an easy way to mount a heat shield to the Powerbomb? 7. Does anything need to be done with the throttle body? I read something about removing a secondary throttle plate but I'm not finding much information about how to do it. 8. Is there anything else I need? I will probably be getting cams later on but I don't want to have no bike while my cams are being sent for upgrading. That will likely be a winter project. I think that's it for now but I'm sure I'll have more questions later on. Thanks dp19 |
3. When you order the EJK make sure you tell them it’s for a 331 and they’ll set it appropriately. |
Personally i would send the ecu off to get reflashed or tuned by a local company. I just hit my 2nd oil change n the 351 kit, so 2000 mile and i get a touch less mpg depending on how i drive
|
I use my original heat shield. Tried one from FMF and it was bogus.
|
Originally Posted by Tacoma660
(Post 543204)
Personally i would send the ecu off to get reflashed or tuned by a local company. I just hit my 2nd oil change n the 351 kit, so 2000 mile and i get a touch less mpg depending on how i drive
|
Originally Posted by Tacoma660
(Post 543204)
Personally i would send the ecu off to get reflashed or tuned by a local company. I just hit my 2nd oil change n the 351 kit, so 2000 mile and i get a touch less mpg depending on how i drive
|
2. I kept my stock cylinder but only bc I bought mine new from someone here and he gave me a great deal. If it’s installed correctly I don’t see any reason to hold onto it if you could use the cash back. Worst case, if you need to swap back to the stock cylinder there’s always plenty available on eBay. |
Originally Posted by NEWPARTSRULE
(Post 543205)
I use my original heat shield. Tried one from FMF and it was bogus.
Also I really appreciate everyone's feedback so far! |
KLXster has a performance exhaust choices and considerations sticky that has a youtube of how to install stock heat shield on power bomb.
https://www.kawasakiforums.com/forum...rations-44444/ |
Thanks everyone for your input! I have ordered the necessary parts for the big bore kit. It's gonna take at least a few weeks to get it all since I'm on the East Coast of New-Brunswick (Canada) and the postal delays from the US to Canada are very real.
One more thing though, do I have to do something with the subthrottle butterfly? Is it necessary to remove it? Thanks dp19 |
| All times are GMT. The time now is 05:05 AM. |
© 2026 MH Sub I, LLC dba Internet Brands