no fuel to 1& 3

[RodnStac]

new member needs help,,,,,1984 interstate,cyl 1 & 3 do nothing at idle.get above 1300 rpm and bike comes alive or you can apply the choke and bike becames stable.should i rebuild ? or i'm i missing something?don't really want to break down the wing unless i have to.

[admin]

Sounds more like a carb synch problem. Get a tool and check it.

[catman]

agree with vic...please check your fuel lines and make sure there are no leaks

[RodnStac]

i changed fuel filter,cleaned the throttle valves which were very dirty & sticky.synced the carbs best i could.now 1,2,4 are very strong cyilinders but 3 still is weak also misses until warmed up [think #3 is culprit]

[SIR tricky]

When were the plugs last changed?

[RodnStac]

changed the plugs when bike started missing also checked spark,it will jump a snapon HEI spark tester. sorry for no picure haven't figured out how to download it yet

[SIR tricky]

changed the plugs when bike started missing also checked spark,it will jump a snapon HEI spark tester. sorry for no picure haven't figured out how to download it yet

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[admin]

i changed fuel filter,cleaned the throttle valves which were very dirty & sticky.synced the carbs best i could.now 1,2,4 are very strong cyilinders but 3 still is weak also misses until warmed up [think #3 is culprit]

It could be a lean mixture on #3 carb, either dirt in the carb or the mixture screw is set wrong.

[RodnStac]

i will try to set mixture screw when i get home this weekend.will post results.thank you

[admin]

Just so you know, lean is in and rich is out.

[RodnStac]

got home this afternoon looked the carbs over,going to have to pull the brass plugs over mixture screws.might as well do a rebuild on them kits dont look that exspensive,what would be a starting point for the mixture screws. 1 1/2 turns out ?

[RodnStac]

sorry i havn't kept this upto date,but busy at home & work.here we go,looked the carbs over, plugs over the mixture screws,decided to finish out the season without a teardown.oct 20 the fuelpump quit,replaced it with a low pressure aftermarket pump.i know looks hidiuos BUT no more fuel starvation problems,no more missing,and runs better than when i first bought her.so now i know the problem,just have to convince wife to justify the cost of a prettier chrome pump.AND i repleced the fuel lines to be on the safer side.wuold have posted earlier today but had to order some patches from vic.thanks for the help , rod

[admin]

I'm glad you got her fixed Rod. Sometimes carb problems can be very elusive and hard to explain in text but you got it figured out finally. What made you suspect the fuel pump? :?:

[SIR tricky]

,replaced it with a low pressure aftermarket pump.i know looks hidiuos

Lets see a photograph, and post the make and model of the pump.