FMX 650 Tuning

[sbikerbud]

cheers for the links. Much appreciated

Just gotta warm the credit card before i thrash it.
Don't want a cold seizure

[mergoofmx]

UPDATE

Hello all again

I have been quite busy with my FMX over the past few nights. I have removed the smog filter and pump, the moisture filter and the carbon filter from the motor. This gets rid of loads of crappy pipe work and plastic bits and makes the motor far more tidy.
I have made some mods to the carb too. I have drilled out the air holes on the bottom of the slide on the diaphragm open to 4mm and I have replaced the main jet with a 220 from a 168 !!! I also lifted the needle by 1mm (with a tiny 1mm thick washer)
I have been testing quite a few different size main jets from 180 to the present 220 but it is still running a bit lean so I will be sticking in a 240 this weekend as I am off to the TT on it.
I have a 240 and 250 main so I will try the 240, do a plug chop and if needbe I will stick in the 250.
The crank breather now goes into fresh air and not into the airbox and the whole transformation is very good.
The power now I far smoother and far more grunty. The wheel easily comes up, RIGHT UP in 1st and 2nd just on power alone and it can easily be lifted in 3rd with a bit of clutching !

More updates when I get back !!

[ROB20Y]

Hi just read your thread about the jetting for the FMX650 I have just fitted a Arrow full system and K&N, In the Dynojet kit the largest jet in a 165 ? you are reccomending a 220 ?

[samben]

Hi just read your thread about the jetting for the FMX650 I have just fitted a Arrow full system and K&N, In the Dynojet kit the largest jet in a 165 ? you are reccomending a 220 ?

the dynojet kit also changes the needle aswell as the main jet. i had the dynojet kit fitted about 2 weeks ago and could not believe the difference. not only is it more responsive (smoother and more midrange) but i am getting better fuel consumption.

[ROB20Y]

Thanks for the info, just ordered to dynojet kit, so looking forward to getting it fitted and set up, has anyone fitted better tyres to the bike as the dragons on the front feel a little unsettled when pushing hard into the corners ?

[mergoofmx]

I tried a 170-180-190-200-210-220. i have a 240 in now but it is running a little rich so i will be sticking the 220 back in.
try it, its not as if your taking a risk, it will only run rich, if it runns lean thats when you will have big problems.

have you all done a plug chop with the 165 in or are you judging it on your right hand????

[samben]

Thanks for the info, just ordered to dynojet kit, so looking forward to getting it fitted and set up, has anyone fitted better tyres to the bike as the dragons on the front feel a little unsettled when pushing hard into the corners ?

i now have pirrelli diablos on . super sticky but you will only get around 1800 miles out of your rear. if your not planing on doing to many miles these are what i would recomend the other thing i would recomend is to wind your rear shock up about half an inch to start with, see how it feels and go on from there.

[sbikerbud]

i now have pirrelli diablos on . super sticky but you will only get around 1800 miles out of your rear. if your not planing on doing to many miles these are what i would recomend the other thing i would recomend is to wind your rear shock up about half an inch to start with, see how it feels and go on from there.

I only managed 2000 from the original rear tyre

When i fitted the 45 Tooth rear sprocket it pulled the back wheel forward about 20-30mm, it did wonders for the slightly slow steering

Now i have the original sprocket on, I find myself running wide in the bends....must practice more

[NEIL]

UPDATE

Hello all again

I have been quite busy with my FMX over the past few nights. I have removed the smog filter and pump, the moisture filter and the carbon filter from the motor. This gets rid of loads of crappy pipe work and plastic bits and makes the motor far more tidy.
I have made some mods to the carb too. I have drilled out the air holes on the bottom of the slide on the diaphragm open to 4mm and I have replaced the main jet with a 220 from a 168 !!! I also lifted the needle by 1mm (with a tiny 1mm thick washer)
I have been testing quite a few different size main jets from 180 to the present 220 but it is still running a bit lean so I will be sticking in a 240 this weekend as I am off to the TT on it.
I have a 240 and 250 main so I will try the 240, do a plug chop and if needbe I will stick in the 250.
The crank breather now goes into fresh air and not into the airbox and the whole transformation is very good.
The power now I far smoother and far more grunty. The wheel easily comes up, RIGHT UP in 1st and 2nd just on power alone and it can easily be lifted in 3rd with a bit of clutching !

More updates when I get back !!

HI MATE
I HAVE JUST JOINED ORG YESTERDAY.
I HAVE JUST PURCHASED A HONDA FMX650 - 07
I WOULD APPRECIATE AND TIPS ON TUNING.
AT THIS STAGE I HAVE JUSTE REPLACED REAR SILENCERS WITH REMUS SILENCERS WHICH HAS IMPROVED PREFORMANCE SLIGHTLY.
REGARDS
NEIL

[sbikerbud]

i think the current list goes something like so

End Cans (which you have done)
K&N Air Filter Kit (or similar)
Dynojet Kit
Large Bore Headers

More serious work would be

New Carb (pumper carb keeps getting mentioned)
New (or reprofiled) Cam?
Gas Flow the head?

There is a website (in German) which has an FMX up to about 53bhp
http://supermoto-umbauten.de/325/Pre...n/FMX_650.html