synchronize/ tuning?
I bought my bike out of NC (near a beach) about 5 or 6 years ago.... when I brought it back, I drove in around for the summer then took it in to have it rejeted for my area (Charleston, WV). It would occationally backfire into the airbox it had a little hesitation comming off idle and would pop out of the exhaust everytime I backed the throttle off fast. So the dealership rejetted the cabs and said they cant fix the hesiation or the popping out the exhaust (two brothers) and said the exhaust does that. About 2 years later I got on here and a few guys talked me though disabling some air system which almost 100% fixed the popping. However I never have gotten rid of the hesitation and it has slowly gotten worse. At the end of the last season... it got pretty bad. Ive been starting it at least once a month during the winter but it didnt seem to change.
I just ordered some NGK plugs Under 2k rpms one of the cylenders is almost not running at all... but it then pops once and then its runs good untill im back under 2K. (before the miss) if I just barely open the throttle its always seems to miss or surge (it also pops out the exhasust) untill i open throttle more or go back to idle. |
clean clogged pilot jet
adjust TPS |
Have you adjusted the tps? They come high from the factory. Spec is 490-500 ohms. I had the same problems with my bike after rejetting until I did the tps today. Very easy to do and it can only help, even if it doesn't entirely fix the problem. Look in the knowledge base section for the how to.
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Carb sync wouldn't hurt either
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to clean out the pilot jet..... do i need to remove and take the carbs apart?
is tps = throttle position sensor? to do a sync do i have to have mecury sticks? |
Originally Posted by superman_006
(Post 261990)
1. to clean out the pilot jet..... do i need to remove and take the carbs apart?
2. is tps = throttle position sensor? 3. to do a sync do i have to have mecury sticks? 2. Yes, look in KB, not a hard thing to do. It will help the starting, but only if #1 above is addressed 3. Not specifically, but you will need a syncing device, you can make one, or buy one. The cool way to sync carbs is with a TwinMax. Look in KB for this too. TwinMax = http://www.rlmotorcycles.com/cgi-bin...69335385.72021 |
If you end up having to get the carbs cleaned you could probably Save some dough by yanking the carbs yourself and taking them to the shop. Then, with the info on the forum, fashion the carb sync tool mentioned earlier.
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Cool... the carb sync tools are much cooler than a few years ago
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I am about to sync my carbs and all I found about this in the service manual is that the main carb is the front one and the difference should be 20 mm Hg (0,8 in). What does this mean? Rear carb 20 mm Hg less or more than the front one? This is my first V-twin, only done this to 4 cyl engines..
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hmm.... i was accually going to "sync" mine....
well i am going to unless someone could explain to me why 50/50 wouldnt make it run the best..... I am taking my carbs off right now |
depends on how much money you have and how much you like to work on your own shit. I would set the TPS first,i.e., eliminate the obvious first. then probably have to adjust the idling up. Then make a sync tool for a couple dollars. Order the fitting for the front carb(4dollars), a little vacuum line and a couple of T fittings and you'll be able to sync your carbs with the tank on. Easy once you do it, and inexpensive, and satisfying.
Do this and see the diff and you likely will not have to get into the carbs. with your TB exhausts, you may need to shim the needles and adjust air mixture for best performance. |
Difference should be WITHIN 20mm.
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Originally Posted by nath981
(Post 262363)
depends on how much money you have and how much you like to work on your own shit. I would set the TPS first,i.e., eliminate the obvious first. then probably have to adjust the idling up. Then make a sync tool for a couple dollars. Order the fitting for the front carb(4dollars), a little vacuum line and a couple of T fittings and you'll be able to sync your carbs with the tank on. Easy once you do it, and inexpensive, and satisfying.
Do this and see the diff and you likely will not have to get into the carbs. with your TB exhausts, you may need to shim the needles and adjust air mixture for best performance. |
1 Attachment(s)
ok....that took about 30-45 mins to get the carbs off. Whats next? where is the pilot jet?
And when i get it all bsck together where do i hook in the sync gauges? ive always hooked them to the intake boots on other bikes Attachment 27486 |
Originally Posted by Stevebis1
(Post 262364)
Difference should be WITHIN 20mm.
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2 Attachment(s)
I dont know what each jet is called... but I left the main one in and pulled the other one out....the 1st one looks pretty clean as well as the inside of the carb... However the jet in my hand was stopped up but i unclogged to with a piece of wire.
I also noticed something the front carb has a 175 and the rear has a 180 main jet in it :confused:...... is this normal? Attachment 27484 Attachment 27485 |
Originally Posted by residentg
(Post 262367)
Nath - that was post number 1234 for you. I notice stuff like that.
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Originally Posted by superman_006
(Post 262375)
I dont know what each jet is called... but I left the main one in and pulled the other one out....the 1st one looks pretty clean as well as the inside of the carb... However the jet in my hand was stopped up but i unclogged to with a piece of wire.
I also noticed something the front carb has a 175 and the rear has a 180 main jet in it :confused:...... is this normal? http://i130.photobucket.com/albums/p...041710_003.jpg http://i130.photobucket.com/albums/p...041710_002.jpg You may as well shim needles and adjust the air mixture to 2.25 turns out, set the TPS, remove the PAIR, etc. |
Yeah... i was reading the "rejetting" section in the knowledge.... It says that that the rear one is larger to make the rear cylender run richer = cooler. I also read where someone was syncing by ideling at 2k and killing each plug and figureing out how far the rpm drop is :shocker::rotf:
but thats not going to sync the carbs Whats the order I should do the TPS/ sync/idle? Because I am assuming I adjust the throttle plates to set the idle and I'll adjust the one to snyc. so each will change the TPS reading. Not to mention ill have to readjust the idle after the TPS and the sync anyhow. |
Originally Posted by superman_006
(Post 262375)
I dont know what each jet is called... but I left the main one in and pulled the other one out....the 1st one looks pretty clean as well as the inside of the carb... However the jet in my hand was stopped up but i unclogged to with a piece of wire.
I also noticed something the front carb has a 175 and the rear has a 180 main jet in it :confused:...... is this normal? Well two things to add here. First, cleaning the pilot jet with a piece of wire is not really a good idea. It is very easy to oversize the hole in the brass jet while you are trying to clean it. The best bet is to just spend the $5 and buy a new one if you can't get it clean with just cleaner and compressed air. Second, stock jetting is 175 front\178 rear but you are close enough ;) Then again they might have changed that in later years. |
Originally Posted by 8541Hawk
(Post 262385)
Well two things to add here. First, cleaning the pilot jet with a piece of wire is not really a good idea. It is very easy to oversize the hole in the brass jet while you are trying to clean it. The best bet is to just spend the $5 and buy a new one if you can't get it clean with just cleaner and compressed air.
Second, stock jetting is 175 front\178 rear but you are close enough ;) Then again they might have changed that in later years. mine is a 1998....Is 175/178 stock jetting no matter what your elevation is? I also have aftermarket exhaust and airfilter. So should I try rejetting? |
Originally Posted by superman_006
(Post 262383)
Yeah... i was reading the "rejetting" section in the knowledge.... It says that that the rear one is larger to make the rear cylender run richer = cooler. I also read where someone was syncing by ideling at 2k and killing each plug and figureing out how far the rpm drop is :shocker::rotf:
but thats not going to sync the carbs Whats the order I should do the TPS/ sync/idle? Because I am assuming I adjust the throttle plates to set the idle and I'll adjust the one to snyc. so each will change the TPS reading. Not to mention ill have to readjust the idle after the TPS and the sync anyhow. |
Originally Posted by superman_006
(Post 262388)
I used the wire out of a bread tie.... it slides though the same jet from the other carb
mine is a 1998....Is 175/178 stock jetting no matter what your elevation is? I also have aftermarket exhaust and airfilter. So should I try rejetting? The high altitude (above 6,500 ft) jetting was 172 front\175 rear otherwise it should be 175\178 stock in '98 |
Originally Posted by superman_006
(Post 262388)
I also have aftermarket exhaust and airfilter. So should I try rejetting?
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You may be right in suggesting the stock air filter, but that doesn't coincide with my experience. I cut the flap and cut the filter out leaving only the screen. Then cut a piece of foam, put filter grease around the perimeter, and sprayed with filter oil, and installed, and it works great.
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Originally Posted by 8541Hawk
(Post 262395)
Well if you are asking me...... put the stock airfilter back in, shim the stock needles .040" and put a #48 pilot jet in and call it good. ;)
The brass fittingAttachment 27480 I urge you to adjust the TPS whie you are in there. Look in KB for sticky. JB |
Originally Posted by nath981
(Post 262393)
as far as syncing by killing the plug, I don't know. Concerning the order, I would shim the needles, set air mixture, PAIR removal and turn plates and cap, set TPS, set up your quick sync vac lines, sync carbs,& make sure to drink a beer between each step.
Clean carb, including needles soaked in seafoam (Check) Beer (Check) PAIR removal (Check) Last year Beer (Check) TPS at 500 omhs... in prgress (Check) Beer (Check) Turn Plates and cap :confused: (maybe too many beers) Sync..... waiting on syncro to get here Why would I switch back to the stock air filter over my K&N? |
Originally Posted by superman_006
(Post 262513)
Why would I switch back to the stock air filter over my K&N?
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Originally Posted by superman_006
(Post 262513)
The syncing by killling a plug couldnt work... even if the theory worked youd be adjusting them with the thottle at 7 or 8 deg more than idle.. so the ofices that let it idle wouldnt even be in use
Clean carb, including needles soaked in seafoam (Check) Beer (Check) PAIR removal (Check) Last year Beer (Check) TPS at 500 omhs... in prgress (Check) Beer (Check) oh hell, you forgot...............your AA meetings! hahaha:D Turn Plates and cap :confused: (maybe too many beers) Sync..... waiting on syncro to get here Why would I switch back to the stock air filter over my K&N? |
Well I tried the TPS... but mine was sitting around 970 and I couldnt get it under 730... so i am going to do the sync first since the TPS on the rear carb... then adjust the TPS even if I have to bend the tab.
I did start it..... Yay.... idleing on both cylenders Anyone ever got the radiator cap off and added anti-freeze without removing the front fairing? I undid a line to get the choke handle out of the whole.... It looks like I can get to it but havent tried yet |
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