Needle shim modification

[emory70]

i could see having some type of system like that to make a car with a very narrow powerband easier to drive in the real world. but it's a crutch, not a power maker. they would need that extra scavenging cause the engine is out of its happy place.

maybe most or all people here that have changed the muffler and/or air filter on their bikes have then lost some mileage after retuning the carb. how did they tune it? on a chassis dyno? how else are you gonna REALLY tune the engine?

[Easy Rider]

Originally Posted by emory70

how else are you gonna REALLY tune the engine?

You "mess" with the needle and main jets until it runs better............or take the recommendation of someone else who has already done that.

We may have had one nut....mmm..err..rider here who did some dyno runs but I doubt it.

[emory70]

i guess i'll live with my muffler for now, but that stupid $40 air filter has to go.

[Water Warrior 2]

Originally Posted by emory70

i could see having some type of system like that to make a car with a very narrow powerband easier to drive in the real world. but it's a crutch, not a power maker. they would need that extra scavenging cause the engine is out of its happy place.

Talk to the designers of BMW car engines. Their variable back pressure system keeps the engine in it's happy place over a very wide RPM range. This is actually old technology now and I would not be surprised if a large % of cars have this to meet emissions while still providing performance and economy

[blaine]

Originally Posted by emory70

i guess i'll live with my muffler for now, but that stupid $40 air filter has to go.

A good replacment is the Hiflo-Filtro-HFA-3503 at less than $20.00.It is listed for the GS 500 but is a direct fit.

:lol: :roll:

[Easy Rider]

Originally Posted by blaine

A good replacment is the Hiflo-Filtro-HFA-3503 at less than $20.00.It is listed for the GS 500 but is a direct fit.

:lol: :roll:

And does NOT require re-jettting, if I remember correctly ????

The stock filter has enough filtering area that they should be good for MANY years of light to medium distance riding if cleaned occasionally. At $20, I'd say that's a good buy if you don't have to screw with any other settings.

[blaine]

Originally Posted by Easy Rider

And does NOT require re-jettting, if I remember correctly ????

Does not any rejetting,drop in and go. :2tup:

[Water Warrior 2]

After 5 years and 50,000 kms my Vstrom air filter is still good. I don't look forward to replacing it because it is a one of a kind and only Suzuki has it. Waiting for Hi-Flo to make them at a cheaper cost and crossing my fingers.

[Boon13]

Would the needle shim mod work on a GN250?

[blaine]

Originally Posted by Boon13

Would the needle shim mod work on a GN250?

Yep,same carb. :cool: