[dragnize]

ok here is some history first...

I have an aftermarket airfilter (ultra flow from xtremerevolutions) and a set of custom pipes from Mortons

I did the carb mod with the shims and trimming of the needle holder..
4 shims
and 2 3/4 turns on the a/f screw
removed pair valves

she was running fine but, I was still still getting a loud popping on dec. so I read a few post here and it said to check and make sure the pipe were tight .. so I checked and behold they weren't as tight as I thought.. so I tightened them up and started the bike. it idles really rough then shut off. pulled the choke and same thing but was getting black smoke out of the pipes..

any clue of what it can be? any help would be appreciated..

 

[ThrilbillyVTX]

I am new to the forum and street bikes but have been wrenching on bikes for 30 yrs.

1. I am not that familiar with the pair valve but it sounds like it may be vacuum actuated. If so be sure that you have not createad a vacuum leak with your carb.

Second I feel you need to do a proper plug check to determine if your jetting is correct after the pipe and air filter mods. with 4 strokes it is not quiet as critical but I have known of 2 strokes seizing from a pipe and filter change with no jet change. The air screw effects your low end and the needle mod will fatten your midrange but will have less effect on your WOT.

A plug check always works best with a new plug. Hold your throttle wide open for a couple of blocks then hit the kill switch and pull the clutch anc chop the throttle just after. Coast to a stop with the clutch in. The plug should be checked without the motor ever turning over anymore. The bottom of the plug should be a no lighter that a dark to mediam dark tan color. Any lighter than that and you are lean and hence the popping on decel. If you rub the bottom of the electrode on your hand you should see a little mark. If the plug is any darker than a light brown then you are too rich.

As far as the jetting goes I prefer to stick with the same brand as the carb. I will usually go up and down in three step jumps.

Good Luck,
Thril

 

[Guest]

Black smoke. Your rich or your useing to much choke. Sounds rich, whats the jet sizes and brand.?

 

[dragnize]

Black smoke. Your rich or your useing to much choke. Sounds rich, whats the jet sizes and brand.?

I did the scar mod so its the factory jets.. I did 4 shims on the needle

2 3/4 turns on the A/F

 

[Guest]

I have never mesd with the ultra flow, but, I dont like useing alot of shims.
I would turn the a/f screw in to 2 1/2 and take a couple of shims out and put in a 200 keihen main jet. Also you may want to check your plugs, and maybe put some new ones in. If you have to use the choke, just use it to start the bike, it is a enrichner, and dumps raw gas into it, not like a reg. choke.
Im running a Forcewinder, stock slow jet, no shims, and a 200 main Keihen. Im at sea level.

 

[dragnize]

I have never mesd with the ultra flow, but, I dont like useing alot of shims.
I would turn the a/f screw in to 2 1/2 and take a couple of shims out and put in a 200 keihen main jet. Also you may want to check your plugs, and maybe put some new ones in. If you have to use the choke, just use it to start the bike, it is a enrichner, and dumps raw gas into it, not like a reg. choke.
Im running a Forcewinder, stock slow jet, no shims, and a 200 main Keihen. Im at sea level.

one of the guys here said he was running the same air intake and he had to go with 4 shims too. I do Have dynojet kit that I had originaly baught before I read about the scar mod.. but I will check my plugs and try turning the A/F to 2 1/2 and check the plugs. thanks again..

 

[Guest]

Like I said, you could be useing the choke to much, and messed up the plugs. Its hard to say.

 

[dragnize]

ok I checked the plugs today and they were black .. so I guess I was running way too rich.. cleanded the plugs and went down to 3 shims.. and left the a/f at 2 3/4 ... bike started right up and reved the throttle and no pop.. but when I tried to take off it died. like if I wasn't getting enough gas..

so if I go 4 shims I am too rich.. if I go 3 not enough. any other tweaks I can try? or should I just change my plugs? please help

 

[trippy57]

Check the back side of the carb to make sure that the choke cable is properly seated. It sometimes gets pulled out a bit causing to run rich......just a thought.

 

[Poison]

ok I checked the plugs today and they were black .. so I guess I was running way too rich.. cleanded the plugs and went down to 3 shims.. and left the a/f at 2 3/4 ... bike started right up and reved the throttle and no pop.. but when I tried to take off it died. like if I wasn't getting enough gas..

so if I go 4 shims I am too rich.. if I go 3 not enough. any other tweaks I can try? or should I just change my plugs? please help

You should at least run with that setup...I think you have something back together wrong....(vacuum leak, choke cable, slide in wrong or not seated right....intake leak....etc....)

 

[Ewing7]

Sounds like a vaccum leak to me. When you start it, does it run for a few seconds then die?, and is the sound real deep?, and is it blowing out a lot of black smoke like it's too rich? If it is doing what I said above, then 9 times out of 10 it's a vaccum leak. I would pull off a vaccum hose an go to your local autoparts store and have them match it up and replace all your hoses, this should fix your problem. I would also change the plugs. You shouldn't be running too rich with that setup. I have the Pro Hyper, 2" drags, Factory Pro 225 main, 58 pilot, with 2 shims on the needle and she runs great!!!!! The last time I jetted my carb, nothing I tried worked and it was acting exactly like I describe above until I determined I had a vaccum leak and replaced all the hoses. Hope this helps, good luck. Also, my A/F is @ 3 turns out.

 

[dragnize]

Sounds like a vaccum leak to me. When you start it, does it run for a few seconds then die?, and is the sound real deep?, and is it blowing out a lot of black smoke like it's too rich? If it is doing what I said above, then 9 times out of 10 it's a vaccum leak. I would pull off a vaccum hose an go to your local autoparts store and have them match it up and replace all your hoses, this should fix your problem. I would also change the plugs. You shouldn't be running too rich with that setup. I have the Pro Hyper, 2" drags, Factory Pro 225 main, 58 pilot, with 2 shims on the needle and she runs great!!!!! The last time I jetted my carb, nothing I tried worked and it was acting exactly like I describe above until I determined I had a vaccum leak and replaced all the hoses. Hope this helps, good luck. Also, my A/F is @ 3 turns out.

well before I went down from 4 shim to 3 shims my plugs were black ... then I took a shim out..

I don't get as much black smoke now but she turns on and idles fine.. its just as soon I put it in gear and go to take off she shuts right off..

 

[Ewing7]

Replace those vac hoses, it's really cheap, I think I bought approx 3' for a couple bucks. You want your bike to be rich @ idle, and with the right air intake to lean out some @ the top end, so the bigger your main jet the more air you need to offset that larger main jet. The 58 pilot jet is perfect for the 1300X, and a 215 - 225 main with 2.5-3 turns out on your A/F should be ideal depending on your air intake. I have the Pro Hyper, but plan to swap out to something like a Hurricane or BAK in the near future. I would replace the VAC hoses, plugs (like ThrilbillyVTX said above you want to pay close attention to your plugs and they should be lite - dark brown, NOT black) and set your A/F @ 2.5 turns out and it should be fine, maybe knock those shims down to 2. Have you cut your carb spring, or are you running the factory Pro spring? What needle are you running? Understand that the more air you add the bigger the main needs to be, air leans, jets and restictive exhaust richen.

Once you get it running decent, you can fine tune it by adjusting the A/F up or down as needed.

When tuning your carb, you always want to select your main jet first by choosing the jet that makes it pull the hardest in the upper RPM's. Once you have that choice made, you then put in the 58 pilot jet (up form stock 55) maybe a shim or 2, and A/F 2.5 - 3 turns out.

Also, you may want to contact SCAR, he's the one that helped me months ago to understand what I now know today. Hope this helps you... 8)

 

[dragnize]

Replace those vac hoses, it's really cheap, I think I bought approx 3' for a couple bucks. You want your bike to be rich @ idle, and with the right air intake to lean out some @ the top end, so the bigger your main jet the more air you need to offset that larger main jet. The 58 pilot jet is perfect for the 1300X, and a 215 - 225 main with 2.5-3 turns out on your A/F should be ideal depending on your air intake. I have the Pro Hyper, but plan to swap out to something like a Hurricane or BAK in the near future. I would replace the VAC hoses, plugs (like ThrilbillyVTX said above you want to pay close attention to your plugs and they should be lite - dark brown, NOT black) and set your A/F @ 2.5 turns out and it should be fine, maybe knock those shims down to 2. Have you cut your carb spring, or are you running the factory Pro spring? What needle are you running? Understand that the more air you add the bigger the main needs to be, air leans, jets and restictive exhaust richen.

Once you get it running decent, you can fine tune it by adjusting the A/F up or down as needed.

When tuning your carb, you always want to select your main jet first by choosing the jet that makes it pull the hardest in the upper RPM's. Once you have that choice made, you then put in the 58 pilot jet (up form stock 55) maybe a shim or 2, and A/F 2.5 - 3 turns out.

Also, you may want to contact SCAR, he's the one that helped me months ago to understand what I now know today. Hope this helps you... 8)

 

[dragnize]

Replace those vac hoses, it's really cheap, I think I bought approx 3' for a couple bucks. You want your bike to be rich @ idle, and with the right air intake to lean out some @ the top end, so the bigger your main jet the more air you need to offset that larger main jet. The 58 pilot jet is perfect for the 1300X, and a 215 - 225 main with 2.5-3 turns out on your A/F should be ideal depending on your air intake. I have the Pro Hyper, but plan to swap out to something like a Hurricane or BAK in the near future. I would replace the VAC hoses, plugs (like ThrilbillyVTX said above you want to pay close attention to your plugs and they should be lite - dark brown, NOT black) and set your A/F @ 2.5 turns out and it should be fine, maybe knock those shims down to 2. Have you cut your carb spring, or are you running the factory Pro spring? What needle are you running? Understand that the more air you add the bigger the main needs to be, air leans, jets and restictive exhaust richen.


well I don't think its the vacuum lines. since it was running when I had the 4 shims in there. it was just running too rich, reason why my plugs were black. and I think thats why I was getting so much pop and some hesitation on lower rpms.

I have stock needle, stock main jet I believe 195, stock pilot jet.. I do have the dynojet spring though..