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dies my carb need to be tuned?

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I have recently bought a drz 400 s, it has an aftermarket exhaust fitted which is the brand "scorpion" it still has the baffle insert to quieten it down, I am unsure weather the carb needs to be tuned to accommodate the new exhaust or will it be ok so long as I leave the baffle in and it's not straight through? Any way to tell if it's not running right?

Thanks

Joe

Edited by _Joe_

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Install a new plug and ride it around a bit. Then pull the plug and see how it's burning. If the bike sputters or coughs at any point in the rpm's, jetting will be required. White plug is too lean,black sooty plug is too rich, tan is what your looking for.

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Thanks I will do that .

Will a less restrictive exhaust generally cause it to run lean or rich ?

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Thanks I will do that .

Will a less restrictive exhaust generally cause it to run lean or rich ?

 

yes

 

should jet it for good measure unless it is perfect.

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Hi Joey,

Any idea which jet kit to go for? There are many types it seems?

Is it hard to get running right without specialist help?

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In the past, JD has provided very good baseline instructions with their kits.

 

Mike

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+1 for JD jetting kits. The instructions are what you pay for but it takes the guessing out of it if you don't know that much about jetting.

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Hi Joey,

Any idea which jet kit to go for? There are many types it seems?

Is it hard to get running right without specialist help?

+2 good kit.

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So are they designed to be run with free flowing exhaust and air filters ? I don't quite understand, if more fuel is being delivered, to stop it running rich some extra air must come from somewhere, and then how do I get the perfect match? I will have to do some googling I think!

Thanks guys

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So are they designed to be run with free flowing exhaust and air filters ? I don't quite understand, if more fuel is being delivered, to stop it running rich some extra air must come from somewhere, and then how do I get the perfect match? I will have to do some googling I think!

Thanks guys

Get the JD kit, it explains all the questions you have plus the jetting you need.

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Just ordered the JD kit :) think I may need a 135 PAJ s as I live in the United Kingdom. And emissions are different :(

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