The DR650 thread

[NordieBoy]

well there must be something wrong with my bike, i put an fmf power bomb header, marving exhaust, carb kit and k,n filter, and i still cant get it past 130 kph whats next do i look at the gearing

Change into top


Stock 15/42 is good for 181kph at the limiter (7,800rpm).

130kph with 15/42 is only 5,600rpm.
It should pull hard to 7,000 at least.

It needs tuning.

I was pulling 135kph on sand with 14/46 at about 7,000rpm and it was losing about 20kph to wheelspin.

[NordieBoy]

Have a look on the right side of the carb, when you give it full throttle check that the rev limiter switch is being triggered. This should only happen when the linkage on the carb is at maximum travel.
I think this switch kills the CDI at about 6,500 RPM. Nordie may now more about that.

Can't tell the difference on the dyno with the switch on or off.

[Eddieb]

well there must be something wrong with my bike, i put an fmf power bomb header, marving exhaust, carb kit and k,n filter, and i still cant get it past 130 kph whats next do i look at the gearing

Put it back to stock? They are good for about 150-155 standard.

What sort of economy are you getting? something must be out with your tuning if it's only going that speed.

[dino3310]

are you sure its not a KLR

[Waipukbiker]

Im getting 18 to 19 kms per litre on the road with a stock carb and exhaust, (Thats staying below 105 kmh) (The needle clip is in the centre position) sprocket ratio is 14/43. Its got all the power I need and its nice and quiet.

[butcherboy]

Is it getting full revs in top gear?

nah struggling to get 6000rpm

[butcherboy]

Put it back to stock? They are good for about 150-155 standard.

What sort of economy are you getting? something must be out with your tuning if it's only going that speed.

even at stock it was the same it does have a bit more midrange at the moment, as for economy went for a ride today sitting on 100-110 about 100km and used $14 woth of gas. not much more then when it was stock, i have a 15tooth front and 41 rear

[butcherboy]

Change into top


Stock 15/42 is good for 181kph at the limiter (7,800rpm).

130kph with 15/42 is only 5,600rpm.
It should pull hard to 7,000 at least.

It needs tuning.

I was pulling 135kph on sand with 14/46 at about 7,000rpm and it was losing about 20kph to wheelspin.

that is top gear it will pull to 6500 mint in fourth as soon as you hit 5th it struggles and just wont pull after 120kmph i have 15/41 gearing

[butcherboy]

took the bike to a suzuki shop is there something they missed when they tuned it

[NordieBoy]

That's about 14-15km/L?

Even my FCR gets 18-19km/L.

As a base line you should be running a 150 mikuni main, open airbox top, needle 3rd from top (no white spacer), mixture screw out to best revs and then in half a turn.

[butcherboy]

That's about 14-15km/L?

Even my FCR gets 18-19km/L.

As a base line you should be running a 150 mikuni main, open airbox top, needle 3rd from top (no white spacer), mixture screw out to best revs and then in half a turn.

i got them to use the procycle kit ive opened the airbox its got the 150 main jet will ask the mechanic on what the needle setting is but i think he used there instructions and a k/n airfilter

[dino3310]

could the 15/41 be just a little to high a gearing- i no with my pig the 15/40 is just to high and wont rev out in 5th but with the 15/42 she'll pull off the speedo no worries, just a thought, with that in mind and a not so right jet it might be enough to run like a dog

[Waipukbiker]

I would be tempted to try a 14 tooth on the front, That was the best thing I ever did, much nicer to ride in all situations. The most fuel efficiant RPM for any engine is where max torque is delivered.
On the DR650 its 4,600 RPM, so higher gearing dousnt automaticly equate to better economy, the further you push the RPM down at 100kph, the harder its working and this can have an opposite effect on economy. With 14/43 sprockets at 100KPH its doing approx 4,200 RPM and thats where mine is. Many years ago, my full time job was dyno testing engines and this included plotting HP, Torque and fuel efficiancy curves and this was done under varios load conditions so Im no stranger to this stuff. leave the high gearing for the American freeways, our country is to lumpy for that.
Wairoa is my home town so I know what its like around there. if you are planning on coming down to Nap/Hastings at all soon you can try mine out with the gearing Ive got.

[butcherboy]

I would be tempted to try a 14 tooth on the front, That was the best thing I ever did, much nicer to ride in all situations. The most fuel efficiant RPM for any engine is where max torque is delivered.
On the DR650 its 4,600 RPM, so higher gearing dousnt automaticly equate to better economy, the further you push the RPM down at 100kph, the harder its working and this can have an opposite effect on economy. With 14/43 sprockets at 100KPH its doing approx 4,200 RPM and thats where mine is. Many years ago, my full time job was dyno testing engines and this included plotting HP, Torque and fuel efficiancy curves and this was done under varios load conditions so Im no stranger to this stuff. leave the high gearing for the American freeways, our country is to lumpy for that.
Wairoa is my home town so I know what its like around there. if you are planning on coming down to Nap/Hastings at all soon you can try mine out with the gearing Ive got.

that would be cool i think i might try the 14 tooth front and see how i go as for testing yours a catch up would be great

[fridayflash]

too right, 15/41 or even 15/43 is way to high, i threw my 15t away a week after i got my bike and even
went up to 44 on the rear (14/44) which suits me and never feels too low even on highway...make 'em
wheelies just a little easier too