This forum has become my most valued tool lol. So I replaced the carb manifolds because they were leaking. The bike would stumble and I could see gas spray out of them. Also didn’t run well at low rpm when cold. However other than that occasional stumble it would idle pretty evenly. Since I had the carbs off I decided to clean them. Adjusted the throttle valves and put it back together. Now it’s backfiring or something constantly at idle and when using the choke. I don’t notice it while riding unless I’m at a stop. I can’t seem to attach videos. The jets are stock I believe and the pilot screw is no longer plugged so I guess the po had some adjustments done. Took the tank back off to make sure everything was in its place. Didn’t find anything. It will idle around 1100 when warm. Any advice is appreciated.
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that's the correct idle speed. be sure idle mixture screws are set somewhere between 2 to 2 1/2 turns out. remove one sparkplug from each cylinder and post photos here."It's only getting worse."
MY rides: '97 VFR750, '90 Red Hawk, '88 Blue/Black Hawk, '86 RWB VFR700 (3), '86 Yamaha Radian, '90 VTR250, '89 VTR250 (2), '73 CB125, '66 Yamaha YL-1
Sold: '86 FJ1200, '92 ZX-7, '90 Radian, '73 CB750, '89 all-white Hawk, '88 blue Hawk, '86 FZ600, '86 Yam Fazer 700 , '89 VTR250, '87 VFR700F2, '86 VFR700F.
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Originally Posted by squirrelman View Postthat's the correct idle speed. be sure idle mixture screws are set somewhere between 2 to 2 1/2 turns out. remove one sparkplug from each cylinder and post photos here.
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make sure the choke cable has sufficient freeplay so. that the wire isn't tight with lever off."It's only getting worse."
MY rides: '97 VFR750, '90 Red Hawk, '88 Blue/Black Hawk, '86 RWB VFR700 (3), '86 Yamaha Radian, '90 VTR250, '89 VTR250 (2), '73 CB125, '66 Yamaha YL-1
Sold: '86 FJ1200, '92 ZX-7, '90 Radian, '73 CB750, '89 all-white Hawk, '88 blue Hawk, '86 FZ600, '86 Yam Fazer 700 , '89 VTR250, '87 VFR700F2, '86 VFR700F.
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Originally Posted by squirrelman View Postthat's the correct idle speed. be sure idle mixture screws are set somewhere between 2 to 2 1/2 turns out. remove one sparkplug from each cylinder and post photos here.
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Originally Posted by Tripleman View PostBike sounds fine,it sounded crap at the start of the video because I’m guessing you were running it with the choke on to long. Get on and ride it and put and put some protective gear on, at least a pair of decent gloves.!
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with clean cabs and a properly-tuned hawk there should be no need to use the choke for more than 10-15 seconds. if it idles too slow, use the adjustment screw to boost it up a bit."It's only getting worse."
MY rides: '97 VFR750, '90 Red Hawk, '88 Blue/Black Hawk, '86 RWB VFR700 (3), '86 Yamaha Radian, '90 VTR250, '89 VTR250 (2), '73 CB125, '66 Yamaha YL-1
Sold: '86 FJ1200, '92 ZX-7, '90 Radian, '73 CB750, '89 all-white Hawk, '88 blue Hawk, '86 FZ600, '86 Yam Fazer 700 , '89 VTR250, '87 VFR700F2, '86 VFR700F.
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Originally Posted by squirrelman View Postwith clean cabs and a properly-tuned hawk there should be no need to use the choke for more than 10-15 seconds. if it idles too slow, use the adjustment screw to boost it up a bit.
Never had a working choke setup on a hawk.. silicone those damned plungers in the holes and call'er'good
Good morning my friend.
Don't spend money and buy, spend time and learn.
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^^ floats should not be adjusted up or down from the 9mm standard setting and never to adjust a/f ratio, that's jetting or mixture screws/idle jets or needles.Last edited by squirrelman; 08-30-2022, 09:41 PM."It's only getting worse."
MY rides: '97 VFR750, '90 Red Hawk, '88 Blue/Black Hawk, '86 RWB VFR700 (3), '86 Yamaha Radian, '90 VTR250, '89 VTR250 (2), '73 CB125, '66 Yamaha YL-1
Sold: '86 FJ1200, '92 ZX-7, '90 Radian, '73 CB750, '89 all-white Hawk, '88 blue Hawk, '86 FZ600, '86 Yam Fazer 700 , '89 VTR250, '87 VFR700F2, '86 VFR700F.
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You gotta make sure the carb is clean and assembled 100% correctly or you won't be tuning it.
Then you do the jetting top-down; doing the idle last.
If you were looking for a support group you're barking up the wrong tree. This place is fulla enablers dude. - Shooter77us
The bitterness of low quality lingers long after the thrill of a low price has gone. - RacerX450
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