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Post by murkyapricot on Apr 14, 2015 21:04:44 GMT -5
Alright guys so I put on a new exhaust, carb, uni filter, performance cdi.. so I'm getting a light popping noise from the exhaust when slowing down just wanting to know if it's normal. Put a 115 jet on and followed alleyoops post on how to tune a carb. I'm still not getting a perfect steady idle but it's running better than it ever has. i took off the old exhaust gasket and put on a new one as well   |
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Post by wilds on Apr 14, 2015 23:26:20 GMT -5
Sounds like your pilot jet is a bit too small
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Post by lain on Apr 15, 2015 1:31:35 GMT -5
Alright guys so I put on a new exhaust, carb, uni filter, performance cdi.. so I'm getting a light popping noise from the exhaust when slowing down just wanting to know if it's normal. Put a 115 jet on and followed alleyoops post on how to tune a carb. I'm still not getting a perfect steady idle but it's running better than it ever has. i took off the old exhaust gasket and put on a new one as well Popping on decel is a sign of running lean. Have you tried messing with the needle or accelerator pump? |
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Post by wilds on Apr 15, 2015 3:32:10 GMT -5
The accelerator pump is not in play on decel.
Normaly, popping on decel depends on:
Too small pilot jet.
A leak between the cylinder and the header pipe or muffler.
A leak between the carburetor and intake.
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Post by lain on Apr 15, 2015 9:37:17 GMT -5
The accelerator pump is not in play on decel. Normaly, popping on decel depends on: To small pilot jet. A leak between the cylinder and the header pipe or muffler. A leak between the carburetor and intake. Watch the pump as you let go of throttle from full throttle, you should see the pump slightly pump on the decel too if close enough, if it isn't touching at all though it won't provide that tiny bit of extra fuel. So... i kinda does. If it isn't pumping then there's a problem, but I was asking in case he maybe was fiddling around over there and accidentily moved the metal bar away so it wouldn't pump anymore at all which would give him a lean condition. I just recently was checking on mine, if it is too far away it'll be too lean in all ranges and you will hear it on the decel. But that's given that the mix is already really lean to begin with. The accel pump does seem to control the mix at least on my carb both on acceleration and deceleration, but it only changes it very momentarily. Either way, it's worth just glancing down and making sure that metal bar isn't all fudged up. It takes like 1 second. |
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Post by lain on Apr 15, 2015 10:26:32 GMT -5
Honestly I think murkyapricot installed too many parts at once. I think you should have installed them piece by piece, seeing how it does after each piece until you have everything installed so you can tell which parts may or may not be causing the issue. |
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Post by murkyapricot on Apr 15, 2015 10:35:17 GMT -5
Well i did use the new cdi with the old exhaust and everything was fine
but add for the carb/exhaust/uni i figured they all went together, no?
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Post by lain on Apr 15, 2015 11:14:30 GMT -5
Well i did use the new cdi with the old exhaust and everything was fine but add for the carb/exhaust/uni i figured they all went together, no? They do not all go together. They work together yes, but each piece has different functions, and each piece can influence the way the other parts work. The carb controls the ratio of air to fuel that is being delivered to the combustion chamber through the intake manifold. The air filter you have now allows a LOT more air than the air boxes do, so that changes how much air is being delivered to the carb by a lot. The exhaust controls emissions to some degree, muffles sound, and provides pressure to the engine on the exhaust stroke, and a lot of exhausts have slightly different designs which give you different results from a stock exhaust. Everything is separate, but working together. |
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Post by murkyapricot on Apr 15, 2015 12:09:37 GMT -5
When i removed the stock airbox there was a small line running back to it but obviously the uni doesn't have that
what do i do with this spare line just remove it?
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Post by lain on Apr 15, 2015 12:12:19 GMT -5
When i removed the stock airbox there was a small line running back to it but obviously the uni doesn't have that what do i do with this spare line just remove it? Depending on what kind of carb you have you can remove all the hoses and canisters (EGR stuff) and just have the fuel line to the carb and the vacuum line from the intake to the fuel petcock. That's what I have right now, and soon will no longer have the vacuum line at all because I am getting a manual fuel petcock. |
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Post by murkyapricot on Apr 15, 2015 13:09:07 GMT -5
Thanks for the quick responses, I'm gunna mess around with the carb some more today and hopefully get it running perfect
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Post by murkyapricot on Apr 15, 2015 15:45:06 GMT -5
On a sidenote I've only ridden about 24 miles with the new exhaust and the head pipe i think it's called is turning goldish
is this normal? Sorry I'm new to all this
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Post by lain on Apr 15, 2015 20:00:56 GMT -5
On a sidenote I've only ridden about 24 miles with the new exhaust and the head pipe i think it's called is turning goldish is this normal? Sorry I'm new to all this Not sure, I just mess with OEM muffler/exhausts. I don't think those fancy high performance exhaust pipes are supposed to discolor, but I have no experience in the matter. I hope someone who has one will chime in. |
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Post by murkyapricot on Apr 15, 2015 20:55:51 GMT -5
From what I've found online leads me to believe it is because it is running very lean and heating up the pipe too quickly
Im gunna switch out the 115 for a 125 tomorrow and go from there
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Post by murkyapricot on Apr 16, 2015 13:16:00 GMT -5
So i changed the jet to a 125 from a 115 and honestly I'm not really seeing any difference, still getting the same popping noise and my a/f screw doesn't seem to affect the idle until it's all the way tightened in then the engine cuts off
Doing quarter turns at a time to lean doesn't seem to do anything.
Not sure what I'm doing wrong but obviously something.
Am I on too large of a jet or what's going on here?
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