Jet size bandit 600 k2-was it deliberately crippled.

[Grommet]

Rebuild carbs and the stamped jet sizes the same, re used needles after ultrasonic cleaning.

 

Bandits were know lean running and a PAIR air into exhaust to clean emissions.

 

Now this could be a conspiracy, but it seems odd two different kits I have same stamped size and they are physically bigger.

 

Now dropping a sprocket tooth and shimming needles common back in day.

 

Wondered if jet size crippled for emissions as a 5-6k flat spot commonly reported from new.

IE Suzuki size not true size

 

Now seems to be making big power from idle and a lot faster- owned it from new and never went as well

 

Thoughts

 

[Mr Fro]

Are you the first owner of the bike? Can you be sure someone else didn't get in there before you and drill them out?

 

Also, it's not uncommon for fours to run larger jets in the middle cylinders.

[Grommet]

Had the bike from new and apart from a free 600 mile check it went back for an alternator under warranty and has never been taken apart or serviced by anyone but myself.

From new flat 5-6k and told they are all like that -dealer offer for can and jets which at the time insurance said no.

 

My confusion is I bought a couple of kits to end up with everything bar emulsion tubes for main jets.

 

Both kits are from different brands and the stamped size are the same.

Both jets sets significantly bigger.

My MK2 same power as MK1 yet bigger carbs and TPS.

 

From new it was always 3k for a smooth pull away, prior strip and clean years ago no change as ultrasonic cleaned factory main jets.

 

I have standard unshimed non California needles as in good condition after ultrasonic cleaning.

 

Now with bigger jets it pulls from idle, flat spot at 5-6k gone.

It seems to have vastly more low end.

 

Research the katana engine out off originally so I'm lead to believe was 100hp.

 

Knowing it has always run lean prior and PAIR smog system to meet new emissions.

 

I'm wondering if Suzuki undersized main jets to meet emissions? Knowing customer complaints a clean and new same size stamped main jets it has no MOT emissions test so golden.

 

Or completely confused that jet size could be so far out in two different kits.

 

Running Superbe though so a mystery

Edited June 19, 2021 by Grommet

[fastbob]

It's an interesting notion . Look at all the diesel car manufacturers who faked emissions data . That said , in all my years of Suzuki ownership I'm surprised that I have never heard of the idea of what are essentially fake jet sizes . 

[Mr Fro]

You could always measure the hole to find the size - that'll tell you if they're right or not.

[Stu]

Is it just two jets that look a different size? 

 

As in two are bigger and two are smaller? 

[Grommet]

Hi the kit says closed circuit racing only when further investigation.

The 4 after market jets are significant amount bigger and all labelled same.

 

Supplier states stamped compatible, number not same size only reference.

 

Make of it what you will the K2 has bigger carbs and TPS yet same claimed 78hp.

 

My conclusion it was crippled to get emissions through with weak mix & air injection PAIR, to keep it insurance friendly.

Otherwise why not drop a tooth or 2 on front sprocket for better claimed acceleration as 120mph would still be reasonable at expense of motorway economy.

 

By doing this it was a cheap bike not affecting higher cost models.