KLX250 EFI big bore - is there an actual EFI solution?
Senior Member
Joined: Mar 2021
Posts: 477
From: Rural Unincorporated Los Angeles County
1st Gear Member
I'll be fine with this.
Junior Member
Joined: Jun 2023
Posts: 4
Then you missed Jeffs youtube page.. JH Motor Club - https://www.youtube.com/channel/UCBV...yrjkj3iOf6Os0Q
He accomplished exactly what you are asking about. All details are available on his page.. And his "experiments" gave us a bunch of useful info about everything connected to EFI 351's - such as the HP limit of the stock injector ( 27-28 hp, which is about what a "uncorked" 351 will make )..
Also, Jeff is a member - I do not know if he keeps up with the forum postings.. @J Higgens
He accomplished exactly what you are asking about. All details are available on his page.. And his "experiments" gave us a bunch of useful info about everything connected to EFI 351's - such as the HP limit of the stock injector ( 27-28 hp, which is about what a "uncorked" 351 will make )..
Also, Jeff is a member - I do not know if he keeps up with the forum postings.. @J Higgens
Senior Member
Joined: Apr 2019
Posts: 143
From: Vietnam
1st Gear Member
I got the keng engine 330cc kit on 2018 klx250 with the race cams, bigger injector, lidless, EJK is working good. The only issue so far is some occasional stalling. Still early days after first mechanic made a few mistakes with the install.
It helped the mechanic used a dyno to tune it. It's around 28-29hp
I have a second klx same year model I'm going to possibly put the EJK on after some smaller modifications and may still fit the dyno jet to the 330.
She is an animal offroad now. Still a little lacking in front suspension. Welp, not sure what can do about that
It helped the mechanic used a dyno to tune it. It's around 28-29hp
I have a second klx same year model I'm going to possibly put the EJK on after some smaller modifications and may still fit the dyno jet to the 330.
She is an animal offroad now. Still a little lacking in front suspension. Welp, not sure what can do about that
Junior Member
Joined: Jun 2022
Posts: 14
1st Gear Member
I got the keng engine 330cc kit on 2018 klx250 with the race cams, bigger injector, lidless, EJK is working good. The only issue so far is some occasional stalling. Still early days after first mechanic made a few mistakes with the install.
It helped the mechanic used a dyno to tune it. It's around 28-29hp
I have a second klx same year model I'm going to possibly put the EJK on after some smaller modifications and may still fit the dyno jet to the 330.
She is an animal offroad now. Still a little lacking in front suspension. Welp, not sure what can do about that
It helped the mechanic used a dyno to tune it. It's around 28-29hp
I have a second klx same year model I'm going to possibly put the EJK on after some smaller modifications and may still fit the dyno jet to the 330.
She is an animal offroad now. Still a little lacking in front suspension. Welp, not sure what can do about that
front suspension. - I tried.
I took a thicker fork oil - liqui moly 7,5
and I used 5mm spacer for the spring.
Space I took out again.
Itīs not expenive to give the oil a try.
And you can use bit more oil 3 or 4 mm - so less air in the fork- my theories should help avoid bottoming.
Junior Member
Joined: Mar 2025
Posts: 6
Hi,
front suspension. - I tried.
I took a thicker fork oil - liqui moly 7,5
and I used 5mm spacer for the spring.
Space I took out again.
Itīs not expenive to give the oil a try.
And you can use bit more oil 3 or 4 mm - so less air in the fork- my theories should help avoid bottoming.
front suspension. - I tried.
I took a thicker fork oil - liqui moly 7,5
and I used 5mm spacer for the spring.
Space I took out again.
Itīs not expenive to give the oil a try.
And you can use bit more oil 3 or 4 mm - so less air in the fork- my theories should help avoid bottoming.
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