Removal of DynoJet Kit

**anselmi** · 2nd July 2009, 17:35

I have a Suzuki DR650SE with an Dynojet kit and K&N filter installed. A friend of mine has the same bike but standard. Mine uses heaps more fuel. Is this due to the Dynojet? if so whats the process of removing the kit? Looking for a bit more economy for the longer trips.

**nallac** · 2nd July 2009, 19:09

Originally Posted by anselmi

I have a Suzuki DR650SE with an Dynojet kit and K&N filter installed. A friend of mine has the same bike but standard. Mine uses heaps more fuel. Is this due to the Dynojet? if so whats the process of removing the kit? Looking for a bit more economy for the longer trips.

yes the kit does increase your fuel useage,bigger jet and different needle.
When i did mine my economy dropped from 20kpl to 15,ran the tank dry at 160k's.
Has the airbox lid been cut?.
You can go back to the stock jetting,with the coresponding lose of power.

Best bet is to get a bigger tank...more power and better range.

**FROSTY:Me** · 2nd July 2009, 19:13

nallac--is it that simple? dont you drill the slide for a dynojet?

**nallac** · 2nd July 2009, 19:25

Originally Posted by FROSTY

nallac--is it that simple? dont you drill the slide for a dynojet?

yes you do drill the slide, but that is only to aid throttle respose.

The only problem i can see is if the airbox has been cut,going back to stock jetting won't be the best idea.

**Robert Taylor** · 2nd July 2009, 19:27

Oem needles and nozzles are very lean burn, especially in cruise range and obviously with a corresponding loss of engine response.
I have never been convinced with dynojet needles, sure youll get way better response ( and indeed the relief holes in the throttle slide may have been enlarged ) BUT, frankly the fueling on the parallell section of the needle is often way too rich ( just off idle before it gets on the taper ) lowering the clip position has minimal effect because it is still for a time on the paralell section.
Of course its also dependent on how well the kit has been fitted and optimised.
These kits are developed primarily for the North American market. Its probably a reasonable assumption that the fuel they predominantly run in those markets is of a heavier specific gravity than our pump fuels here and therefore will respond to suction through the carburetor venturi a little more sluggishly, requiring richer calibration in needle thickness, taper thickness etc.
I think many of their fuels contain different base additives, some with a degree of oxygenates, again requiring richer calibration.

**TripleZee Dyno** · 2nd July 2009, 19:37

Originally Posted by anselmi

I have a Suzuki DR650SE with an Dynojet kit and K&N filter installed. A friend of mine has the same bike but standard. Mine uses heaps more fuel. Is this due to the Dynojet? if so whats the process of removing the kit? Looking for a bit more economy for the longer trips.

Generally speaking dynojet equipped bikes use far more fuel than they need to. The recommended settings usually end up far too rich when used with our fuel.
Going back to standard parts and a decent tuneup will usually work, if you dont have the stock parts we have had pretty good success retuning dynojet kits for better economy and power. Contrary to popular opinion more fuel doesnt necessarily mean more power, rather the right amount of fuel will give the best power and economy.
cheers

**Sensei** · 2nd July 2009, 20:26

Ran Dynojets in a GSXR1100R I did alot of 1/4 mile drags with . Found they wore out really quickly & went out of tune about as fast due to the fact that the neddles where made of very soft material . Ended up replace with genuine needles & needle jets then retuned by a local Speed tuner & got the Quickest Time down the 1/4 & flying which record still stands today 14ys later

. Go Genuine parts & find a tuner that knows what they are doing .

**F5 Dave** · 3rd July 2009, 22:35

On top of that the needles are often rough & wear the emulsion tube. Take it out & have a real serious look in good light. Any hint of ovality will mean bad consumption & likely running. Vibrating singles esp.

**anselmi** · 10th July 2009, 21:48

Cheers for that, i already have the 4.9 gallon tank so gets the kms and has tonnes of power, but looking for economy, travelling from Russia to London next year so economy has preference of power. Airbox lid has been cut and k &n filter installed