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really need help!
- newowner79kz750b1
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- 79 kz750b4
i am having some problems with it running. it ran great when i first bought it and a few days after i started having problems. ill start off with this.
when i first got it i had to run with the choke all the way on.
started tinkering with it. ended up cleaning the float bowls,needle, seat,there was i think a jet in the bowl that unscrews also that i cleaned. changed the spark plugs and ran great! ended up putting sea foam in the tank like the directions called for and started acting up again. popping from the exhaust, sputtering, no lowend power, but when i would give it some gas and open it up a bit it would run fine. so today this is what i did (carbs were rebuilt two years ago by previous owner) i do believe him cuz all the parts looks great!
cleaned the bowls and everything again. new plugs, adjusted the floats (noticed one float was adjusted different then the other one so thats why i adjusted them)and checked them with the clear tube method, adjusted the pilot screw to the specs in the manual. with all of that i got the bike to idle with the choke being completly off. but still hesitates and sputters. no popping though. everything is stock on the bike. exhaust ect. one thing i did notice though is i have about a 1/2"x1/8 wide hole in my exhaust before the muffler. could this be causing me problems with the way it is running? kinda of make sense to be cuz when i give it good throttle and picks up and runs great! i dont no what else to do but weld this hole and hope for the best. any help would be greatly appreciated. sorry for such a long post
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- newowner79kz750b1
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- clickster
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when i first got it i had to run with the choke all the way on.
Sounds like a lean condition. Although your exhaust leak is probably contributing to the problem you probably have an intake leak. Check your carb boots and manifolds and your airbox. Any air leak in the OEM setup will cause the problem you are describing.
Terry
'79 LTD 1000
'69 BMW R50 (previous)
'84 ZX900 Ninja (previous)
'81 Honda CBX (previous)
'79 KZ1000 (previous)
CSR 305 (previous)
Bigfork, Montana
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- newowner79kz750b1
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- Tested
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Looking forward to following advise posted now and in the future.
2008 KLR 650
1977 KZ 750
_____ Have had _____
1981 KZ 440
1970's CR 125
1982 KLX 175
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- 650ed
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newowner79kz750b1 wrote: there was about half a tank and i only put about 1/4 can of sea foam. so not really what the directions said but ive used it like this before with no problems. not on a motorcycle before though
I wouldn’t change anything until I made sure it wasn’t a fuel problem, and the good news is this is really easy to try. Seafoam instructions say 1 oz. per gallon. If you added 1/4 can that's 4 oz. if that was added to 1/2 tank (that’s about 2 gallons) of gas (or less). The mix at that point was at least double the recommended strength. If your estimates are off a little the ratio may be even further off. I would drain that fuel and put it in my car or truck and fill the bike's tank with fresh gas. If you're lucky, the problem will be solved without any further action needed. Seafoam is good stuff, but too much can make the gas burn inefficiently. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- TexasKZ
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1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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- riverroad
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When I first bought mine about five years ago, my #2 carb was having serious problems just like yours. I dropped the float bowl, cleaned it up and all that, but nothing I did would fix it. I did everything possible while trying to to avoid removing that dreaded air box. I sprayed WD-40 all of the place looking for a vacuum leak, nothing. Even futily cleaned and oiled the advance weights and chanting incantations to the gas gods. But nothing. Sometimes it ran great, other times, like crap.
Finally I decided it was time to bite the bullet and remove the air box and the carbs. When I did, I was both totally shocked, pissed off, and relieved at the same time.
Right before my eyes I instantly discovered my problem.
Somehow, the PO managed to jam the carbs back on while simultaniously folding over the edge of the #2 carb boot. The thing was sometimes sealing itself, and other times it was just sucking air.
When it comes to used bikes, Forest Gump said it right. "Sometimes ya neva know whut ya gonna get".
So check your carb boots. And check them for cracks while you're at it.
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- newowner79kz750b1
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- jeffasaki
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78 Z1R
78 KZ1000
76 KH500 gone
71 HS1B 90
81 GS 1100 gone
80 PE400
02 KLR
Ontario Canada
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- newowner79kz750b1
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