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engine rpm question/problem?

  • Thread starter Thread starter boris
  • Start date Start date
B

boris

Guest
hi just a quick question
my gs450e will sit at 1k on the rev counter no probs
i can sit at 3k revs and every 500 mark there after on the rev counter using throttle control
but between 1.5k and 3k i aint got a chance
i can sit at 1.5k or 3k but it wont hold anywhere inbetween
is this a throttle adjustment problem?
it feels like a powerband lol

other than that it moves and holds nicely anywhere else in the rev range

any ideas anyone?
 
What year is your bike? This will help determine which carbs it has. The things to look for and the adjustments are different for the two sets of carbs, the BS series ending in '79 and the VM carbs starting in '80.

Sounds like you might have the VM carbs, though. Were you "blessed" with the sealed adjustments on the pilot screws like we were? If so, remove the seals and richen those screws about half a turn.

Let us know a bit more about the bike, and whether you have done anything like...rescue the bike from a long storage, let it sit all winter with gas in the carbs, bought it from someone who "tried to fix it, but it still doesn't run".


.
 
VM carbs are mechanical slides and were used until 1979. In 1980 the carbs were changed to the BS series which were constant velocity or CV types.

E.


Steve said:
What year is your bike? This will help determine which carbs it has. The things to look for and the adjustments are different for the two sets of carbs, the BS series ending in '79 and the VM carbs starting in '80.

Sounds like you might have the VM carbs, though. Were you "blessed" with the sealed adjustments on the pilot screws like we were? If so, remove the seals and richen those screws about half a turn.

Let us know a bit more about the bike, and whether you have done anything like...rescue the bike from a long storage, let it sit all winter with gas in the carbs, bought it from someone who "tried to fix it, but it still doesn't run".


.
Click to expand...
 
ok bike details

gs450e 1987 europen spec
mikuni carbs

sat partialy in parts for a while (2 years maximum)
was mostly put back together and sold to me
ive done work to her since though partial strip and service ect ect


the spark plugs were checked a month or 2 ago and looked normal

i put new sparkplugs and a new battery in yesterday
there is no spluttering ect between 1.5k rpm and 3k
it just shoots to 3k very much like a powerband type jump
after 3k rpm its normal type responce to throttle
below 1.5k rpm same
she sits at 1k rpm tickover
and other than between 1.5k and 3k rpm she runs and responds
normal

hope this helps
 
Are you riding it during this test or sitting in your driveway in neutral?
The point of the "mini powerband" is when your slide starts to lift the jet needle out of the needle jet which allows gas to flow from your main jet.
 
chef1366 said:
Are you riding it during this test or sitting in your driveway in neutral?
The point of the "mini powerband" is when your slide starts to lift the jet needle out of the needle jet which allows gas to flow from your main jet.
Click to expand...

driveway yeah
so its completely normal then ?

until im 100% legal i cant take her for a quick test ride
the police are on top around here at the moment
thanks to a load of idiots buying sports bikes and popping wheelies ect
on the main road ect
dont fancy getting points and fined lol
 
boris said:
driveway yeah
so its completely normal then ?
Click to expand...
No, it's not normal.
I suggest adjusting the mixture screws using the highest rpm method. If adjustment doesn't go well, then lightly seat them and set them equally out about 1 1/2 turns. The idea is to be sure they're reasonably close.
Then I strongly recommend a good vacuum synch. Carbs out of synch will cause a problem exactly as you describe.
Keep a record of where your mixture screws are currently set so you can return them to that position if you wish to.
If the above doesn't help, then I think you need to clean/check the throttle plates for smooth operation and possibly clean the carbs with extra attention paid to the pilot circuit.
 
KEITH KRAUSE said:
No, it's not normal.
I suggest adjusting the mixture screws using the highest rpm method. If adjustment doesn't go well, then lightly seat them and set them equally out about 1 1/2 turns. The idea is to be sure they're reasonably close.
Then I strongly recommend a good vacuum synch. Carbs out of synch will cause a problem exactly as you describe.
Keep a record of where your mixture screws are currently set so you can return them to that position if you wish to.
If the above doesn't help, then I think you need to clean/check the throttle plates for smooth operation and possibly clean the carbs with extra attention paid to the pilot circuit.
Click to expand...

cheers ive got one of them vacuum carb synch things coming to me from a relative .
so soon as its here i will give it a go

this is the first gs ive owned so wasnt sure if it was normal lol
 
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