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Hesitation at 1500rpm

Old 04-06-2012, 01:30 PM
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Hesitation at 1500rpm

So i cleaned the carbs on my bike, set tps to 498ohms (took me forever to get it that close) put everything back together, it fired right up but there is a little hesitation when you rev it hard from idle, after about 1600rpm it pulls real hard. Idles absolutely perfect

Any one have any suggestion on what to do, im thinking get carbs synced, cause they are probably off

also if someone could point me in the right direction of how to make a sync tool and instructions for a super hawk i would appreciate it

Last edited by masterhacker1989; 04-06-2012 at 01:46 PM.
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Old 04-06-2012, 10:01 PM
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Yep, it's on here somewhere too lazy to find it right now. Sync'ing will do wonders if it's off, especially if you're messing with TPS and the carbs were pretty unclean.
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Old 04-06-2012, 10:16 PM
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I cleaned them 1 at a time, they had a little crap built up in it, nothing too bad,but i gues any build up is bad. I used 8 cans of carb cleaner, I used the straw and blew the mother loving crap out of every passage, I soaked all jets overnight in berrymans carb cleaner, then overnight in Sea Foam, then sprayed carb cleaner though them all to make sure that all passages were open

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Old 04-07-2012, 02:31 AM
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I ordered a Carbtune 2 tool today, I saw a bunch of good reviews on them yeah I could make one but I bought one

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Old 04-07-2012, 07:10 AM
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Originally Posted by masterhacker1989
I ordered a Carbtune 2 tool today, I saw a bunch of good reviews on them yeah I could make one but I bought one
That's what I use. Go to the pet store and buy two of the small air regulators that are used on aquariums to put in your hoses. You dial them down to smooth the fluctuations of the indicators. You'll see when you use it. You will also need an assortment of vacuum line tees so when you cut your vacuum line that runs under your tank you can install one and then just plug up the nipple with a rubber plug when you are done synching. You have the nipple on your front cylinder right?
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Old 04-07-2012, 07:25 AM
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I have no idea about a nipple in the front cylinder, ill look into it, as far as air regulators I actually have a couple of them cause i have a 90 gallon fish tank
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Old 04-07-2012, 07:29 AM
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It's called a "boost valve" if you're trying to look it up. There's already one on your rear cylinder.
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Old 04-07-2012, 07:34 AM
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Originally Posted by 7moore7
It's called a "boost valve" if you're trying to look it up. There's already one on your rear cylinder.
I call it a major pain in the posterior to install!

Check out this thread featuring remarks from 7moore7 and I think it will help you out since it has pictures too:
https://www.superhawkforum.com/forum...uestion-26975/
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Old 04-08-2012, 01:59 AM
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Lol I hope they are the cleanest carbs in the forum. I have a screw installed in there, so Ill need to pick up that, maybe i can get lucky and pick one up form my local hardware store, or fastenal, I have to go there anyways, Im replacing a whole butt load of screws with stronger cap heads

Whats the general conciseness on installing pair valve block off plates, I saw a bunch of posts saying to just disable them, but Im thinking I should just remove them while im messing with my bike

Last edited by masterhacker1989; 04-08-2012 at 02:05 AM.
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Old 04-08-2012, 04:49 AM
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Originally Posted by masterhacker1989
Whats the general conciseness on installing pair valve block off plates, I saw a bunch of posts saying to just disable them, but Im thinking I should just remove them while im messing with my bike
Functionally no difference. Appearance wise they are low cost improvement.
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Old 04-08-2012, 08:18 PM
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I like low cost improvements, also Ill be able to get rid of that annoying goddam hose at the front of the air box, that thing is a pita to hook up with big hands
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Old 04-10-2012, 06:12 AM
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I was thinking that that hose in the front went to the pair valve (front most hose going to front most hookup on engine), Ive never really paid attention to how the hoses were routed, only where they hooked back up, i would have seen that when I went to disable the pair system

anyways...Is there any reason I wouldn't want to install a aftermarket breather on there, Like I said I don't particularly like hooking that goddam hose back up, I don't know If i could get one to fit, ill need to look into that, also I ve heard some engines need a vacuum created by the intake to evacuate gasses properly, would that be a issue with a superhawk?

One more thing, can I completely remove the pair valve without any negative consequences, The only negative thing ive seen is that you will need to make your own gasket, but Ive not seen anyone mention if it actually affects anything Removing it

Last edited by masterhacker1989; 04-10-2012 at 06:54 AM.
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Old 04-18-2012, 10:04 PM
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Originally Posted by RWhisen
That's what I use. Go to the pet store and buy two of the small air regulators that are used on aquariums to put in your hoses. You dial them down to smooth the fluctuations of the indicators.
I just stick a old pilot jet in each line but good tip
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Old 04-19-2012, 05:14 AM
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K, I got some silicone vacuum hose, Replaced all vacuum lines, put my fuel filters on, installed pair block off plate, Removed pair valve T and installed it by the fuel tank for syncing carbs, installed boost valve. I just need to sync the carbs now, I may do that tonight, don't know yet, have to see what transpires
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Old 04-19-2012, 10:08 AM
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Well my comments on your last post would be, first silicone and gasoline don't play well together, so you might want to keep an eye on those lines..... (gasoline dissolves silicone....)

The screen in the tank is a good filter and there have been problems with fuel flow with some inline filters, so another thing to watch or remember if you run into fuel starvation at higher rpms.
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Old 04-21-2012, 09:38 PM
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I synced my carbs today, got rid of the hesitation, but its seems to rev up a little slower than is used to, anyone have a video of them revving a stock bike, i want to compare it and see.
Ill throw up a video if someone could check it out ofr me. As far as the silicone vacuum line I didn't replace the one on the front crab with silicone because I know it dissolves, I used regular vacuum line for that
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Old 04-21-2012, 10:48 PM
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I put up a video SOmeone plese check it out and tell me if you think it revds up slowly for a stock bike:
video-2012-04-22-00-32-08.mp4 - YouTube
http://www.youtube.com/watch?v=HpKLgIEdiwM (same vid with contrast and a few other things turned up)

I was getting on it pretty good, at first, Towards the middle I floored it from idle a couple times, It doesnt run bad or anything, like I said it seems to be revving up slowly

Ill do another video during the day also if you cant tell whats up

Ill try and see what happens without fuel filters, one wierd thing to note is my idle adjuster was backed off all the way when I first got my bike, and it idled at 1100rpm, After I cleaned the carbs, it wouldnt idle i had to crank it up quite a bit to get it back to 1100 rpm, im thinking I may need to play with my tps again after adjusting the idle

Last edited by masterhacker1989; 04-21-2012 at 11:21 PM.
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Old 04-21-2012, 11:23 PM
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Cool, I was just being paranoid I guess. Ill re do tps tommorow, Im friggin tired I worked 3rd shift went to my nieces b-day party, slept for 4 hours woke up and I need to go to bed...
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Old 04-23-2012, 06:39 AM
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SO I finally took my bike for a test drive today, And It ran like ****, wouldn't rev over 5K when driving, and I had to floor it to do 60, But revved just fine sitting there, So me thinks either my fuel petcock if F***ed up or it doesn't like the fuel filters I added, cause its acting like its starving for fuel (similar thing happened to my shadow when I pinched a fuel line years back), I'm going to pull fuel filters off and check it out, Worst case scenario I have next week off to play with it, Ill get her figured out by then Hopefully
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Old 04-23-2012, 08:32 AM
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Originally Posted by masterhacker1989
SO I finally took my bike for a test drive today, And It ran like ****, wouldn't rev over 5K when driving, and I had to floor it to do 60, But revved just fine sitting there,
This sounds a lot like you have connected the vacuum line to the vent port on the petcock. Check this first!
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Old 04-23-2012, 06:23 PM
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I already checked it, in fact that was the first thing I checked, Like i said im thinking my petcock isnt working correctly or it doesnt like the fuel filters I added, which is wierd cause they are huge and work on cars...Fun fun fun
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Old 04-23-2012, 08:18 PM
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How are your plugs and wires? Getting enough spark?
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Old 04-24-2012, 03:52 AM
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Looks like it still has a stumble to me. Your pilots are set where? What type of air filter do you have?
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Old 04-24-2012, 05:56 PM
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Its got a new stock air filter, No idea on pilots, Ive not touched them, except to clan them, has brand new plugs, wires are good too, Like i said I think my petcock isn't letting enough gas through only thing I can think of, because pulling out the choke doesn't do anything at all when driving it,and if it wasn't properly adjusted it would richen it up and help/hurt performance wouldn't it? , Anyone ever see a petcock **** up like that before?

How much vacuum does it take to open up, Ill try to simulate with my mighty vac, then I can see if its opening all the way

what ever is going o its since I pulled my carbs off and cleaned them, I didn't touch any adjustments on them, and they are properly seated and the rubber boots are in good shape

Last edited by masterhacker1989; 04-24-2012 at 06:13 PM.
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Old 04-24-2012, 06:28 PM
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I would get to a baseline setup. Set your pilots to 2.5 turns out. Synch carbs. Fine tune from there.

Seems like it is getting plenty of gas to me.
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Old 04-24-2012, 06:31 PM
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It ran before you worked on them? Then see post #18
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Old 04-24-2012, 06:54 PM
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I plan o n trying it without the filters this weekend, I work third shift and it sucks working on crap in the dark, I wouldn't think the filters would be a issue though, they are huge filters that are made for cars or whatever, but you never know, my shadow was picky about having a fuel filter also
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Old 04-24-2012, 07:09 PM
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and most if not all cars have a fuel pump not gravity feed
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Old 04-25-2012, 04:54 AM
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I understand that, I figured I would try the filters, another forum member said they worked for him. And if they didn't work I already had bought new fuel line, Some things are picky about having filters on them, my night hawk didn't care, shadow did, my buddy's savage didn't mind one, my other buddy's ancient Honda (cant remember model) didn't like one, So i figured it was a crap shoot on whether or not it would work, I would personally rather have one, Ive had better luck running them than not

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Old 05-20-2012, 06:27 PM
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Almighty, so its been a while since Ive been on here, anyways same issuem no power at all, revs fine just sitting there, petcock is hooked up correctly, no fuel filters anyone have any idea what up, I'm about ready to let this damn thing get repo'd if I cant get this figures out (no job, not going to bother paying for a bike that don't run)

Last edited by masterhacker1989; 05-20-2012 at 06:30 PM.
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