Need some tuning advice on recent rebuild.

[fc3swrx]

Ok, guys, I've been reading and I'm by no means an expert but I understand how all this stuff works, just dont have the experience to point me in the right direction.

 

quick history: I bought this 98 shee a while back, and long story short one of the pistons came apart. So I had the cylinders bored out and bought new forged pistons, and got everything installed.

 

Now, this is where things got confusing, I was able to get the thing started but it wouldn't idle, I went ahead and rode it around the block and the top end felt crazy fast, but because it wouldnt idle right I decided its better to park it. So I read more and more, and I realize that its probably running lean, I'm assuming the bore changed the fueal/air requirements enough that I might need to change the jets.

 

I decided to rebuild the carbs, I bought two stock rebuild kits with 200 main jets. ANyway, when I checked the jets in the carbs I realized they were 260 and pilot was 25, and then I noticed that the needle was not identical to the one in the kit, its about a 1/4" smaller. It also has already been adjusted to where it only has one circlip position available to enrichen the needle.

 

ANyway, I'm not sure what to do. I know its running lean on idle and on the top end. The idle revs real high and almost hard to shut off. Because I dont know the history of the banshee I dont know what was put int he carbs before I owned it. It has after market pipes and intake. But mostly stock from what I can tell.

 

ANyway, I'm hoping you guys might make a suggestion. My gut tells me to goto a 280 or 300, and the pilot jet being a 25 should maybe be a 35-40?? THe part I'm really unsure of is the needle jet? I just dont have the experience to know what to do with it, From what I've read there are all kinds of needles out there, I just dont know what I need.

 

Or do I simply move the circlip to the only next availble richest position and hope for the best?

 

Also, I never adjusted the TORS the last time, I just didn't know that was how the idle was supposed to be adjusted at the time.

 

 

thanks in advance.

[06specialedition]

Ok, guys, I've been reading and I'm by no means an expert but I understand how all this stuff works, just dont have the experience to point me in the right direction.

 

quick history: I bought this 98 shee a while back, and long story short one of the pistons came apart. So I had the cylinders bored out and bought new forged pistons, and got everything installed.

 

Now, this is where things got confusing, I was able to get the thing started but it wouldn't idle, I went ahead and rode it around the block and the top end felt crazy fast, but because it wouldnt idle right I decided its better to park it. So I read more and more, and I realize that its probably running lean, I'm assuming the bore changed the fueal/air requirements enough that I might need to change the jets.

 

I decided to rebuild the carbs, I bought two stock rebuild kits with 200 main jets. ANyway, when I checked the jets in the carbs I realized they were 260 and pilot was 25, and then I noticed that the needle was not identical to the one in the kit, its about a 1/4" smaller. It also has already been adjusted to where it only has one circlip position available to enrichen the needle.

 

ANyway, I'm not sure what to do. I know its running lean on idle and on the top end. The idle revs real high and almost hard to shut off. Because I dont know the history of the banshee I dont know what was put int he carbs before I owned it. It has after market pipes and intake. But mostly stock from what I can tell.

 

ANyway, I'm hoping you guys might make a suggestion. My gut tells me to goto a 280 or 300, and the pilot jet being a 25 should maybe be a 35-40?? THe part I'm really unsure of is the needle jet? I just dont have the experience to know what to do with it, From what I've read there are all kinds of needles out there, I just dont know what I need.

 

Or do I simply move the circlip to the only next availble richest position and hope for the best?

 

Also, I never adjusted the TORS the last time, I just didn't know that was how the idle was supposed to be adjusted at the time.

 

 

thanks in advance.

 

Whats your elevation? Have you done a plug chop?

 

I would run your needle on the middle clip. That should get you at a good starting point. FYI moving the clip towards the blunt end (top) is leaner, and towards the pointy end is richer.

 

Start rich and work your way down. I prefer to dial the main in first, then you can mess with the air screws.

 

As for the pilot depending on your mods and elevation you will either run the stock 25 or a 27.5, you shouldnt need anthing bigger.

 

Make sure both carbs are synced with one another as well.

Edited November 28, 2010 by 06specialedition

[fc3swrx]

Whats your elevation? Have you done a plug chop?

 

I would run your needle on the middle clip. That should get you at a good starting point. FYI moving the clip towards the blunt end (top) is leaner, and towards the pointy end is richer.

 

Start rich and work your way down. I prefer to dial the main in first, then you can mess with the air screws.

 

As for the pilot depending on your mods and elevation you will either run the stock 25 or a 27.5, you shouldnt need anthing bigger.

 

Make sure both carbs are synced with one another as well.

 

I'm in Dallas Texas, so I think we are pretty close to 0 elevation.

 

Thanks for the advice, what threw me off was the difference between the stock kit and what was already installed. With the main at 260 and the pilot 25, I wasn't sure where the Needle should be. The needle clip was one notch away from the richest. But it was running lean as it was.

 

I guess the real question is: Should I expect to change the jetting simply because of the bore and engine rebuild?

Edited November 28, 2010 by fc3swrx