engine jetting question - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 15 (permalink) Old 06-09-2010, 10:19 PM Thread Starter
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engine jetting question

hi everyone i'm new to this web site, but i had just bought a 2003yamaha v star 1100 classic and i'm not very smart about the motor. so my question is the bike has cobra longboy exhaust on it and i had taken the baffles out because the sound it makes without them is so sweet. now the old owner said he had rejetted it for the pipes but how do i know if taking the baffles out will hurt the motor what signs should i look for or should i not worry about it. thanks for any answers. josh
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post #2 of 15 (permalink) Old 06-09-2010, 10:44 PM
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It should be alright , but just to be on the safe side run it for a week or so and check your plugs. If it is running too lean your plugs will be a very light color. They will look too clean.

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post #3 of 15 (permalink) Old 06-09-2010, 11:53 PM
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I agree!

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Originally Posted by HTMNKYLVE View Post
It should be alright , but just to be on the safe side run it for a week or so and check your plugs. If it is running too lean your plugs will be a very light color. They will look too clean.
I agree if its running too lean, they will look white, kinda chalkie looking. What your looking for is a tan to brown color on the plug, and if they are black it means your running too rich. Good luck, I just did a modification on the airbox on my 1100 custom and it lean it out some so I had to close off the old air intake port in favor of the new port I put in the front of the airbox. My plugs were showing signs of chalkie look, so I had to close off the old air intake port.
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post #4 of 15 (permalink) Old 06-13-2010, 09:55 PM Thread Starter
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thanks for the advise i have checked the plugs after a long ride today and they are a tan/gray color what do you think i should do.
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post #5 of 15 (permalink) Old 06-14-2010, 02:29 AM
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I would leave it alone!

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thanks for the advise i have checked the plugs after a long ride today and they are a tan/gray color what do you think i should do.
I would leave it alone for now, but run it for awhile and check them again. The gray color might be a sign that its a little lean, so for now I would run the way it is, and say check them again in 2-3 weeks. if they are the same. I would say leave it alone.
When mine is running okay, it is a tan color.
Bob aka busterrm
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post #6 of 15 (permalink) Old 06-14-2010, 12:25 PM
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I'd be really surprised if you didn't need to rejet after removing baffles. You're opening it up to a LOT more airflow.
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post #7 of 15 (permalink) Old 06-14-2010, 01:02 PM
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I would agree, if you remove the baffles you should definetly re-jet.

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post #8 of 15 (permalink) Old 06-14-2010, 02:06 PM
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Your exhaust is gonna get out faster, but your air isn't gonna speed up on the intake side. More Air needs more Fuel, No More Air means no jetting change. If your bike was running well before, it will be fine after removing the baffles. Use a mirror and check to see if your PMS screws have had the brass plugs removed, to point you in the direction of if a jetting change has been made. Most pipe companies want to sell you a jetting kit because its maybe $20 in parts and $75-$100 in cost to you. Do the math. Check out this chart

http://www.sloneservices.com/SilverB...-Jetting-Specs

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post #9 of 15 (permalink) Old 06-14-2010, 05:45 PM
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From what I have seen of the aftermarket pipes and the baffles installed they are free flowing to begin with. Removing the baffles should not cause much change in the fuel\air mixture that would require a rejet. See how the bike runs before deciding to rejet.

Doug

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post #10 of 15 (permalink) Old 06-14-2010, 09:24 PM
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I did the same with my shotgun pipes, I didn't need a re-jet after removing the baffles because they actually caused no restriction. If you can see all the way through your baffles like mine, I'd say you don't need a re-jet either.

06 V-Star 1100-Trigger
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