1997 cyinder 3&4 skip

[blacktrain]

hi, trying to get this bike back to life, sitting a long time , cleaned carbs and lots of other work , bike fires rite up  cylinders 3 and 4  dead ,if i spray carb cleaner into vac ports on intake tube they will come back . could this be a carb sync issue ,1997 valk 1500 thanks ,i have had these carbs off like 5 times cant think anything is blocked , did notice the chrome intake tubes on left bank get hotter than right side after running  10 minutes  dont get that either?? help  thx

[Pete]

Have you checked spark?
If not do so as 3/4 are a common to 1 coil.

[Chrisj CMA]

Most likely still a carb issue. Clean looking is not always clean enough. If a jet or vent is still clogged you get what you got

[blacktrain]

Have you checked spark?
If not do so as 3/4 are a common to 1 coil.

hi, yes when i pull the plug wires you can hear it jumping, also i bought a set of used coils and wires and installed them , the tach guage is missing with that cause any of this.thx

[blacktrain]

Most likely still a carb issue. Clean looking is not always clean enough. If a jet or vent is still clogged you get what you got

i think its a carb issue also, i would like to get a know good set and bolt them on ,i put new pilot jets and float needles . tired of taking them on and off but i think mabey i will just mess with the two that are not working and leave the rest alone,see what happens.thx

[Pete]

Make sure that the idle passage and needle is clean and flows fluid on 3 and 4.
Also did you replace the o-rings on the idle needles? If not do so.
That should make it idle.

[rugguy]

Did you disconnect the coil pack that provides spark to four of the cylinders? It's the one that is attached to the left side motor mount. If so you may have have two of connections switched. That would cause two cylinders to miss even if you show spark from all plugs.

[gordonv]

Have you verified fuel in those 2 cylinders? I'm thinking the drain port on the bow, open it up and see fuel flow out. Run the bike with the enricher on fully (do you know how to do that?), so the cylinders flood, turn off, remove plug and inspect for wetness.

At what point are the cylinders dead, how do you know they aren't working?

[blacktrain]

Have you verified fuel in those 2 cylinders? I'm thinking the drain port on the bow, open it up and see fuel flow out. Run the bike with the enricher on fully (do you know how to do that?), so the cylinders flood, turn off, remove plug and inspect for wetness.

At what point are the cylinders dead, how do you know they aren't working?

gordanv, at idle i can remove plug wires at plug and no change in engine,carb cleaner in the intake port and they kick in . i will check for fuel in bowl at drain didnt think of that ,thx also if i put choke on it dose get better

[9Ball]

What are the pilots set at...how many turns out?  Sounds to me like slow jet or pilot jet problems.  Did you install new o-rings on the pilots?  Are they reassembled correctly, spring, washer, o-ring?  Make sure the old o-rings are not stuck in the carb body. Try the easy stuff first.

Did you clean the jets or replace with new?  Having gone through multiple carb removals the first time I cleaned mine, I now only install new jets...small price to pay for me.

[Ricky-D]

gordanv, at idle i can remove plug wires at plug and no change in engine,carb cleaner in the intake port and they kick in . i will check for fuel in bowl at drain didnt think of that ,thx also if i put choke on it dose get better

To me, it seems that would indicate the carburetors are not in sync.

***

[blacktrain]

just bought a complete rebuild kit for all carbs, hope this fixes it . the book says  1 3/4 on pilot screw ,

[blacktrain]

did a complete rebuild on carbs , ran good . took it to local dealer 'honda' they sync and adjusted the pilot screws . at last it runs good . thanks for all input . going cruisin

[Forge]

Glad you got it sorted out. Now ride the heck out of her and keep on smiling!

[9Ball]

Rather than start a new post it is better to update the original thread.  This helps others when they are researching solutions to a similar problem.

Here's a reference to the original post so that your original problem and the final fix are easier to find.

http://www.valkyrieforum.com/bbs/index.php/topic,102774.0.html

Thanks for the update