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fluffing on pick up

  • Thread starter Thread starter janner
  • Start date Start date
J

janner

Guest
Right guys, help please, just bought my mint gs650gt and it is hesitant and missing from low to mid range, once it get spinning it shoots off ok, also when you blip the throttle its missing too and dosent have that instant rasp that i expected, does this sound like a carb issue to you or timing, it has a set of new plugs in, but has been off the road for 7 months , any help really appreciated. jon
 
Hi,

Yes, the carbs need a proper cleaning. Have you addressed all of the maintenance items in your "mega-welcome"? Your bike may look mint but all of the rubber, electrical connections, etc, are 30 years old. Everything needs to be checked.

Thank you for your indulgence,

BassCliff
 
Ok, don't tell anyone I said this as it's against all the GS 'rules' (and it is bad advice). But as we've got a bit of sunshine and you might want to take advantage of it and get some miles under your belt it's worth slinging some Redex in the tank and running for a few miles.

When it starts raining, or if the Redex doesn't help, the carbs will reward a strip down and proper clean / new rubbers etc.
 
yeh, i agree with you on that one, same thoughts as i had , try the redex route and do the strip down in the winter layup
 
Hi,

Yes, a couple of good doses of you favorite carb cleaner in the fuel might help. Good luck. If not, well, you know what to do. ;)

Thank you for your indulgence,

BassCliff
 
Going to take her for a few miles tommorow and wil have fresh fual and redexin her , so hopefull y it,ll do something, i fired her up tonight in the workshop from cold and it started first time straight away and settled down nicely, but as i said before slightly wooly on the pickup, could be pilot jets slightly gummed, or do you think the advance / retard unit is sticking?
 
janner said:
Going to take her for a few miles tommorow and wil have fresh fual and redexin her , so hopefull y it,ll do something, i fired her up tonight in the workshop from cold and it started first time straight away and settled down nicely, but as i said before slightly wooly on the pickup, could be pilot jets slightly gummed, or do you think the advance / retard unit is sticking?
Click to expand...


I think it's carbs, but what do I know?

cg
 
When I first got my bike last year I made a point to clean the carbs, adjust the valves, change all the fluids and regular tune-up stuff too. I did all of this before really riding it a lot. I also did an air-box refurbishment from BassCliff's website recently.

The carbs were dirty. It still ran OK like yours, but I knew a good cleaning would pay off. It makes a lot of difference. Did you do the maintenance stuff to it?

Before I forget, I have an 83' 850L. Look at my signature.
 
janner said:
Going to take her for a few miles tommorow and wil have fresh fual and redexin her , so hopefull y it,ll do something, i fired her up tonight in the workshop from cold and it started first time straight away and settled down nicely, but as i said before slightly wooly on the pickup, could be pilot jets slightly gummed, or do you think the advance / retard unit is sticking?
Click to expand...
Those pilot jets clog real easy if it sits- try running it hard and see what happens, you might get lucky. Lots of downhills with throttle snapped closed might create some turmoil!
 
It'll be your carbs almost certainly - advance / retard mechanism is very reliable. Mind, don't forget to check the valve clearances.
 
I havent had chance yet to get out on the gt, but as soon as the insurance is through and taxed I,ll be putting some miles on and running fresh fuel and redex, hopefully that,ll help and then strip down the carbs in the winter layup
 
Uppadte !! changed the oil and filter tonight and also drained the oil and renewed to gear oil in the rear hub, took her for a ride and its really hesitant through the rev range and will not rev out cleanly at all, its like its missing and holding back, took the plugs out on return and 3 were looking leanish and one was darker, the one that was dark was no 3 from the right viewed from the seat, also the baffle plates on the end of the right silencer are darker i.e sootier than the left bank, was going to paignton bike show this weekend but its a no goer now with it like this, is there an easy way to balance the carbs in situ ? cheers jon
 
Well it was worth trying. Your problems won't be solved by a balance, you're going to have to pop them off and give them a really good clean. Follow the carb rebuild tutorial (I think the tutorial is for carbs off an 850 but they're 'the same thing') and strip them down completely and clean them completely.

Rain due tomorrow anyway.....:(

Oh, and check all the O rings.
 
Third carb from the right is two, if I understand your post correctly. Rich on two can be a sign of fuel in the vacuum line from the petcock, which indicates a bad petcock. I have not experienced this particular failure mode myself.

You should verify that there is no fuel in the petcock vacuum line.

That said, you will more than likely also end up cleaning the carbs to get rid of the part throttle lean condition eventually.
 
also after the oil and filter change i started her up and the mysterious rattle had vanished completely, after the ride it was there again !!!! looks as if the carbs will be coming off and an o ring kit ordered, i,m bidding on a carb balancer at the moment too
 
850 Combat said:
Third carb from the right is two, if I understand your post correctly. Rich on two can be a sign of fuel in the vacuum line from the petcock, which indicates a bad petcock. I have not experienced this particular failure mode myself.

You should verify that there is no fuel in the petcock vacuum line.

That said, you will more than likely also end up cleaning the carbs to get rid of the part throttle lean condition eventually.
Click to expand...

which one is the vacuum line and is it worth completely blanking the plug off and if so what do i watch out for once done ?
 
janner said:
which one is the vacuum line and is it worth completely blanking the plug off and if so what do i watch out for once done ?
Click to expand...

also what are the symptoms when there is fuel in the vac line ? sorry for all the questions but i am new to the gs range and have always had modern bikes and 2 strokes
 
hampshirehog said:
This shows you where your rubber hoses go to:

http://members.dslextreme.com/users/storagecliff/images/hose_locations.html

#2 has the vacuum nipple. If you blank it off (hose with bolt stuffed in it as a temp) you'll have to switch the fuel tap to run on prime.

Did your old oil smell of petrol? You might have your carbs leaking petrol into the crankcase - thus thinning the oil and making the rattle louder.
Click to expand...

funny it did smell stale and petrolly !!! what are the symptoms though if the petcocks leaking ?
 
janner said:
funny it did smell stale and petrolly !!! what are the symptoms though if the petcocks leaking ?
Click to expand...

Worst case scenario is hydraulic lock and bent rods!!! In your case it maybe suggests that fuel has dribbled in to the carbs when she's been stood and made it's way down in to the crankcase.

When the engine is running petrol can get sucked down the vacuum tube in to the carb on the head side of the slide. This cylinder will run very rich as a result.
 
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