GPZ600r Throttle sticking

[Magnet]

My GPZ600R failed its MOT on a few things, one being the throttle not returning properly. I have tried re-routing it, but it makes no difference. It returns fine if I pull the cable out of the hand control, but one back on the bike it sticks. The twist grip is free moving so its not that, I assume its going to be the return springs on the carbs? Any ideas?
____________________
It’s not that I’m so smart, it’s just that I stay with problems longer.

GPZ600R Sold, Now ZZR600

[Casper]

Undo/losen the back cover of the switchgear and see if its returning faster. If so then something is snagging. Also lift the tank and try as the cable may be router wrong, if it works with the tank up then its snagging.

[_Iain_]

Tank off. Toothbrush covered in motor oil 10/40 fresh out of the drain bucket from the gs is what i used.

Rub oil all over the exposed bits of cable, alll over where the cable runs, and over anything else that moves when you move the throttle.

pump throttle for a while.

If still not loosened open all the way (assuming it sticks at this point)

then loosen off the cable adjusters. one then the other. Odds are it'll start moving a little bit then snap shut. and work fine. Play with the adjusters when it does this till both cables have tension & the throttle snaps shut on its own.

Done this today with great success
____________________
Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[Magnet]

Tried all that and it only returns when the cable is pulled while not connected to the twist grip. I think its gonna be carbs out for new springs.

I may invest in some new cables first to see if they are any better. I suppose it serves me right for buying a bike just because it was black lol
____________________
It’s not that I’m so smart, it’s just that I stay with problems longer.

GPZ600R Sold, Now ZZR600

[Casper]

Have you stuck oil down the cables? The old lube inside could be bunged up with years of shit

[Magnet]

Tried WD40, still no joy I would be quite happy leaving it as is, but Mr MOT man says no.
____________________
It’s not that I’m so smart, it’s just that I stay with problems longer.

GPZ600R Sold, Now ZZR600

[Casper]

[Magnet]

Thanks for the advice, I will give it a go and see if it improves. I have nothing to lose trying I suppose. I bit off a bit more than I can chew buying this bike. I wanted a 600 Bandit and somehow ended up with a GPZ600R lol... Looked great, sounded great other than the horrid cam chain slap they all seem to do. Turns out all the swing arms bushes, suspension bushes are knackered. Plus I had to have new brake pistons, new fork seals, the list goes on So I pay £400 for the bike, at least another £400 on repairs and after riding the er-6 I did my test on my bike feels like a bag of shit haha... Oh well, best start saving up
____________________
It’s not that I’m so smart, it’s just that I stay with problems longer.

GPZ600R Sold, Now ZZR600

[Casper]

They were good bike in there day. I had the GPX600 and that blew up racing a dam siera on the Edinburgh bypass. Lucky it was at a slip road so i did not lose face. I got another 2nd hand engine and did the same a few month later. Cam chain adjuster was shit to start with. If you thing the chain is good look into a manual one. Lots of parts were used in other Kawasaki's round the same year so plenty cheap parts kicking around. Yeah 400 sounds a bit high. I have seen bandits going for 500 with an MOT.

[Magnet]

£400 was about right I thought as the overall condition is good other than the issues lol. Its done 40k, but I have seen many go way over that. I will probably keep it 6 months and then look for something else. I have spent so much on the CBT, theory and DAS that it didn't really leave me any real cash for something nicer. I do like the look of the GPZ, I just find it feels so small after riding the ER-6 on my training/test. I like the bulky feel of the bike and its black

https://i531.photobucket.com/albums/dd352/GTR_turbo/GPZ600r/GPZ.jpg
____________________
It’s not that I’m so smart, it’s just that I stay with problems longer.

GPZ600R Sold, Now ZZR600

[GPZ600R]

The throttle cables have an adjuster on them, in the middle, normally sit right between the plugs 1 and 2 if routed correctly, These are too tight and that is preventing the throttle from returning. These are to adjust the free play in the gas on and gas off throttle cables. Loosen them off, but make sure you keep an eye on the throttle, last thing you need is too much play, its a bitch when coming out of a tight corner and you want to give a little gas and you spend too long taking up the slack,, been caught out by surprise a few times on that one !!

As always, with a picture. Red shows the throttle cables, loosen here. The green circle is the choke adjuster.

https://i79.photobucket.com/albums/j124/Omega25/GPZ600R/throttles.jpg

[Magnet]

I will have a go at that tomorrow, thanks for the advice If I pull the cable when not in the twist grip it does return, but when in the twist grip it doesn't very well. I have checked the grip and that is nice and loose. It will return when the steering is traight but not at either lock. I re-routed the cables over the top of them pipes, but to no avail.
____________________
It’s not that I’m so smart, it’s just that I stay with problems longer.

GPZ600R Sold, Now ZZR600

[GPZ600R]

So, i hear the throttle is sorted, now here is the drain pulg for your coolant system, 8mm plug:

https://i79.photobucket.com/albums/j124/Omega25/GPZ600R/GPZ600R00015-1.jpg

[lihp]

What condition are the cables in? It may be worth either new cables or oiling your existing cables

[GPZ600R]

Throttles are sorted now ,,, was the adjusters. They were too tight