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popping noise
- coach59
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Thanks for the help....
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- Nebr_Rex
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adjust mixture screws or install bigger pilot jets
2002 ZRX1200R
81 GPz1100
79 KZ1000st daily ride
79 KZ1000mk2 prodject
78 KZ650sr
78 KZ650b
81 KZ750e
80 KZ750ltd
77 KZ400/440 cafe project
76 KZ400/440 Fuel Injected
www.dotheton.com/forum/index.php?topic=39120.0
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- loudhvx
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1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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- bountyhunter
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1979 KZ-750 Twin
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- TeK9iNe
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- What did you do!?!
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If the engine is in a known good running condition state, and everything is stock - air box/stock filter, stock exhaust, then the stock # turns out on the mixture screws, and the stock jets will work fine in a clean set of carbs.
Dont start to change out jets. Additional air is getting into one, or more of the cylinders. Making sure that absolutely everything is air tight from the air filter to the exhaust tip is crucial to proper operation.
The carb to engine holders is the usual culprit, and a good cleaning and some Permatex motoseal, or #2 gasket maker will take care of that.
With the bike running, spray wd40 on the carb linkage and seals, etc. listen for rom change, and watch exhaust for black puff if any gets sucked in a leak.
Make sure the airbox conections/hoses are all air tight at the carbs. If they're dried up and hard, replace them.
Good luck.
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
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- bountyhunter
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1979 KZ-750 Twin
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- bikerjim
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- 1986 T-type Regal
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1959 Sears moped, 49cc
50's/60's Peugeot moped, 49cc
50's Mustang motorcycle
1959 Royal Enfield Indian Chief, 700cc
1979 KZ750B, owned since new
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- KYKZ1100
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1981 KZ1100A1 Shaft
2007 BMW R1200R
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- loudhvx
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I've had popping for three years in my KZ1100 - ever since I put it together. I've tried everything - new valves, pistons, rings, carb holders, vacuum caps, exhaust gaskets, larger pilot jets (twice), sealing off air recirculation system, adjusting float levels, adjusting fuel mixture screws, etc. Today I sync'd the carbs and used a ColorTune to see what was going on in the cylinders. After the sync there was still popping but even though it idled well there was no combustion in one of the cylinders - the plug was firing but no fuel was being burned. I adjusted the air (fuel?) mixture screw until that cylinder was firing at idle and the popping is gone. I'm pretty happy - the popping was really bugging me and it's gone. Did I mention that the popping is gone?
But what happened to the popping?
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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- 650ed
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Did I mention that the popping is gone?
If you later miss the popping sound you may want to put a tablespoon of unpopped popcorn in each muffer for old times sake. :silly:
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- Old Man Rock
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"Color-Tune to see what was going on in the cylinders. "...
Thank you, for an outsider (other than me) just proved once again why this is a handy tool to have around... You can see what's going on in the chamber....
How much more easier can that be in adjustments and T-shooting....
1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter
Phoenix, Az
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- TeK9iNe
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Maybe I missed it but you didn't mention if the popping was gone?..... :laugh: :laugh: :laugh:
"Color-Tune to see what was going on in the cylinders. "...
Thank you, for an outsider (other than me) just proved once again why this is a handy tool to have around... You can see what's going on in the chamber....
How much more easier can that be in adjustments and T-shooting....
+1 Agreed... Love that tool now, it saves me sooo much time.
Before, I would have to hold the rpm up slightly where an engine popped worst and crank more mixture into the cylinders via the mix screws to determine which cylinder/carb had an issue. Now I jsut throw in the colortune, and I can see immediately where I need to be/what to do, without an hours extra work.
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
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