Install the tensioner and check again just to be sure.

 

Assuming your TDC on the power stroke - it seems to be correct.. It'd be nice to see a photo further away to see both gears.. Noise and error checks - turn it by hand, If it checks out - then by starter with plug out, If that checks out -then a start to idle only..

 

I turned the engine 3 times by hand and rechecked each time at TDC. Then installed the tensioner and cap and rechecked 3 more times. It started on the first push of the button, maybe because I disabled the acr. All sounded normal, maybe a bit smoother or more rythmic at idle and throughout the mid range. After warming up I went for a quick ride. Better lower power, not as much as I thought but noticeable. I may need to jet up to get the full benefit. I'll share my thoughts after a few days of testing it.

Thanks, cheers

 

I think you will find the starting much easier and warm up much faster if you are dealing with the carb version and have the jetting close.

Remember it is a 250 four stroke and few things are going to be earth shaking when modifying. Years back I had the guys at the bike shop send me out on a quick test riding a CRF250R motocrosser. I was seriously disappointed, expecting more bang than it had. I didn't think it would be that weak compared to a CR250R, but WAY weaker. Stronger than my KLX, but just not the same as a two stroke.

 

Neonarc, with MCM you can likely go richer on the Fuel screw and possibly the needle from non MCM.. The main jet should not need adjusting.. I think you already know this..
Just my opinion - which could be worthless.. lol

 

klx68: I am running the carb and just went thru a jetting experimentation so it's spot on or very close. Starting was never hard, just had to crack the throttle a hair it it would fire up on the first try. Now it's starting if I even look at the start button jaja. I like that.

klxster: That makes sense because the increase from the MCM is in the mid range as I understand. I'm a little dubious if I should move up the needle because last time I tried 5N it was really rich, stumbling and bogging a lot. I guess the only way to know is trying right? jaja. Any simple way to tell if it needs more fuel from the needle? It's probably to close to tell?

Thanks, cheers

 

Yep, for some reason the MCM makes the KLX start instantly.

Man, I have no idea if she'll take 5N now , like you said, wouldn't hurt to try because if she will - that's MOPOWAH ! Like wheelspin as she comes up on the needle power (offroad)..

 

I did the needle after the mod, tried shimming the needle. But my jetting is pretty much the same as the mod. If it is a bit on the lean side in the jetting that is fine, the Dial-A-Jet adds the necessary fuel. I even went with the 125 main to stay lean on the brass.

Starts like a charm.

 

I also noticed instant starts after MCM and I repositioned the ACR instead of deactivating it.. So it has to be the retime giving instant starts..?

 

I think retarding the exhaust and advancing the intake retains more intake charge as does either disabling or re-timing the compression release. Disabling the compression release definitely keeps more compression, re-timing the compression release will also keep compression higher when starting.

Then there is the proper jetting with the pilot jet and idle mix screw adjustment.

Better squeeze, better mix... better BANG!


Edited by the dyslexic writer - thanks Klxter