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TOPIC: Re:Jetting Forum Tools Post New Topic Show latest posts Rules

#107864 allsanitylost (User) Fresh Boarder Posts: 45 Jetting 5 Months ago   I may have to pull off my manifold today. If I have to, I want to do a porting job on it. If I port the manifold do i have to jet the carb?   Logged     The administrator has disabled public write access. #107867 greyphart (User) bad idea+ experience = good judgement Platinum Boarder Posts: 1101 Re:Jetting 5 Months ago   Recommended highly. Greyphart   Logged     www.greyphart.webs.com   The administrator has disabled public write access. #107868 onefastbob (User) WARNING!...I can be Annoying! Junior Boarder Posts: 104 Re:Jetting 5 Months ago   allsanitylost wrote: I may have to pull off my manifold today. If I have to, I want to do a porting job on it. If I port the manifold do i have to jet the carb?I am thinking about only porting the part that goes to the rear cylinder to make the rear run a little leaner so it will match the front. Any comments?   Logged     My Image is NO longer illegal!   The administrator has disabled public write access. #107869 Musky (Moderator) Doc took Grams beer Moderator Posts: 13486 Re:Jetting 5 Months ago   If you haven't jetted at all yet or don't want to I wouldn't bother porting the manifold. My op anywho.   Logged       The administrator has disabled public write access. #107871 Musky (Moderator) Doc took Grams beer Moderator Posts: 13486 Re:Jetting 5 Months ago   onefastbob wrote: I am thinking about only porting the part that goes to the rear cylinder to make the rear run a little leaner so it will match the front. Any comments? Porting makes you richer.   Logged       The administrator has disabled public write access. #107872 Flashback (Moderator) The devil to pay, and no pitch hot Moderator Posts: 4583 Re:Jetting 5 Months ago   intresting thought bob, it makes some sense,,let us know how it turns out...   Logged       The administrator has disabled public write access. #107876 onefastbob (User) WARNING!...I can be Annoying! Junior Boarder Posts: 104 Re:Jetting 5 Months ago   Flashback wrote: intresting thought bob, it makes some sense,,let us know how it turns out...I was thinking since these bikes and most v-twins run rich on the back cylinder there must be a way to eliminate this. Since we have a single carb. it complicates this. I owned a 2000 Vstar 1100 and noticed that the rear carb was jetted differently than the front. After reading about the SVS problem it seems to me this occurs mostly on the rear cylinder. Reducing the over rich condition of the rear cylinder might make valve deposits less and lessen the chance of getting SVS. One down side I can think of is that if I cause more air to go through the rear cylinder this will lean the mixture and the rear will run even hotter than it does now. I may sometime in the near future try slightly porting the manifold at the rear and see what happens. Again comments are appreciated.   Logged     My Image is NO longer illegal!   The administrator has disabled public write access. #107877 onefastbob (User) WARNING!...I can be Annoying! Junior Boarder Posts: 104 Re:Jetting 5 Months ago   allsanitylost wrote: I may have to pull off my manifold today. If I have to, I want to do a porting job on it. If I port the manifold do i have to jet the carb?I apologize for taking over your post. You will have to rejet if you port the manifold.   Logged     My Image is NO longer illegal!   The administrator has disabled public write access. #107878 Flashback (Moderator) The devil to pay, and no pitch hot Moderator Posts: 4583 Re:Jetting 5 Months ago   Well, when you think about it, the only difference is the rear jug is running hotter than the front,,that's the only difference I see anywho....if you lean it out, it will get even hotter, but what you are suggesting is to richen the flow to the rear which would cool it.... like I said,,,,,,,let us know..   Logged       The administrator has disabled public write access. #107879 onefastbob (User) WARNING!...I can be Annoying! Junior Boarder Posts: 104 Re:Jetting 5 Months ago   Flashback wrote: Well, when you think about it, the only difference is the rear jug is running hotter than the front,,that's the only difference I see anywho....if you lean it out, it will get even hotter, but what you are suggesting is to richen the flow to the rear which would cool it.... like I said,,,,,,,let us know..No the rear jug runs richer also. Look at any plugs the back ones are almost always darker with fuel deposits. The fuel mixture according to the plugs needs to be leaner at the rear cylinder. If you run more air to the rear with the same jetting it should (I Think) be a leaner mixture. Running both cylinders with the proper air fuel mixture seems to me would be a better running bike. Kinda like syncronizing 2 carbs. Only problem is that rear cylinder always runs hotter and running it leaner would increase that.   Logged     My Image is NO longer illegal!   The administrator has disabled public write access.

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