GPX750R resurrection

All GPx and GPz Models

Re: GPX750R resurrection

Postby Mister_T » Sun Dec 11, 2016 5:16 pm

I could not buy circlip pliers small enough at Repco or Bunnings so I had to modify an old one by using the Dremel with a stone on the the tips and it worked fine.
gpx750r_clutch_master_after.jpg
Much better. Can't get rid of the corrosion pits without more work. Maybe next time.
gpx750r_clutch_master_after.jpg (96.83 KiB) Viewed 783 times
User avatar
Mister_T
KSRC Member
KSRC Member
 
Posts: 122
Joined: Sat Dec 12, 2015 10:18 am
Bike: GPx750
State: Victoria

Chain issue resolved

Postby Mister_T » Tue Dec 13, 2016 3:47 am

I am happy to announce that the chain issue has been rapidly resolved by the UK-based seller, Bike Torque Racing, who trade on eBay as biketorqueracing . They also trade through their website at http://www.biketorqueracing.co.uk/ .
I notified biketorqueracing of my concerns via eBay messaging and quickly heard back from Geoff Stubbs there. I sent over other pics of the chain I had taken and Geoff quickly organised another chain to be sent out to me at no charge and covered the freight as well.
It is nice to deal with a business that encourages repeat custom.
If you do strike a problem, it probably helps if you don't go in guns blazing. A bit of politeness and some good pics to help explain the situation are always helpful. The person on the other end could easily be having as bad a day as yours.
User avatar
Mister_T
KSRC Member
KSRC Member
 
Posts: 122
Joined: Sat Dec 12, 2015 10:18 am
Bike: GPx750
State: Victoria

Re: GPX750R resurrection

Postby Kwakked Up » Tue Dec 13, 2016 6:07 pm

Gotta love a good news story :kuda:
06 zx10r - road
99 zx7r - trackie
77 z1000 - project
User avatar
Kwakked Up
KSRC Regular
KSRC Regular
 
Posts: 579
Joined: Mon Jan 10, 2011 2:18 pm
Location: Goulburn
Bike: ZX10R
State: New South Wales

Re: GPX750R resurrection

Postby Smitty » Wed Dec 14, 2016 10:42 am

Mister_T wrote:It could have been a nice day for a ride here in Melbourne today, but I chose to do the clutch hydraulics instead due to a minor drip from the clutch master when in use.
I know clutch hydraulics tend not to get much attention, but even this surprised me.

Geez, where does all the sludge come from?



.. 30 year old brake fluid!
when I got mine in the mid 90s (about 10 years after they came out) my clutch master fluid
was black like that. Took some cleaning out and then also had to flush new fluid thru to finish the job
Image
GOTTA LUV the 12R!!
User avatar
Smitty
Extreme Post Whore :-)
Extreme Post Whore :-)
 
Posts: 11363
Joined: Wed Apr 21, 2004 1:59 pm
Location: 3rd rock from the Sun
Bike: ZX12R
State: Victoria

Re: GPX750R resurrection

Postby Mister_T » Mon Mar 20, 2017 9:11 pm

Not much happening lately, been riding more than fixing which is always a good ratio.

Changed the oil and filter again the other week. Mmmm, fresh clean oil.

Changed the coolant on the weekend. More rust came out than I would have liked. I tested the old coolant with some test strips I had lying around and it tested good. The test strips were somewhat out of date but I sanity checked one of the strips from the batch with some pure water and got the results I expected. New test strips and kinda pricey for what they are.
By the book, the coolant should be changed every 2 years. That means by now the coolant should have been changed about 14 times. I doubt that has happened.

At least the surge tank and the filler and bleeder are easy to get to, sited up in the right fairing so there is not much excuse not to. The cooling system only holds about 2 litres so it is not an expensive task, either.
gpx750r_coolant_bottle_and_filler1.jpg
gpx750r_coolant_bottle_and_filler1.jpg (61.12 KiB) Viewed 190 times


I wish the surge tank was easier to clean out. You would think a product like CLR would get the rust out easily but I guess there is too much other stuff inhibiting it. No pics of the process. Cooling systems are wet and messy and not conducive to handling electronic gear along the way.

The temp gauge reads lower than I would expect. Running temp is about 1/3rd up the gauge. The fan cuts in before 1/2 way up.
I'll have to see if there is a volt reg in the gauge cluster for the temp and fuel gauges.
User avatar
Mister_T
KSRC Member
KSRC Member
 
Posts: 122
Joined: Sat Dec 12, 2015 10:18 am
Bike: GPx750
State: Victoria

Re: GPX750R resurrection

Postby javaman » Tue Mar 21, 2017 11:59 am

Where would the 'rust' came from? Aluminium don't rust do they?

I need to do/improve the cooling on my GPZ900R. 15 min in any traffic and it goes to the red zone. Have drained, change cap, etc. Which is funny as my aircooled 750 can sit in traffic all day no worries :?
alien.gif andi - Red ZX6R, R6, GPZ900R
"my dad's motorbike is cool it is all ways clean.oheter pepole' s motorbikes
are't like my dad's one it's because their is one not always clean."
-ariel circa 2007
http://GPZninja.blogspot.com/
User avatar
javaman
KSRC Contributor
KSRC Contributor
 
Posts: 2409
Joined: Sun Nov 21, 2004 8:39 pm
Location: Bonbeach, VIC
Bike: GPz900
State: Victoria

Re: GPX750R resurrection

Postby Mister_T » Tue Mar 21, 2017 5:04 pm

javaman wrote:Where would the 'rust' came from? Aluminium don't rust do they?

Ally does not rust but it does corrode.
There is still quite some ferrous material in the GPX cooling system. The GPX uses "wet-sleeve" cylinder liners (with a "closed deck" cylinder block) which are directly cooled by the liquid. The in and out water manifolds on the cylinder block are steel. The waterpump impeller and some thermostat parts may be steel but plated to reduce chemical activity. There are steel bits in the pressure cap. The coolant pipe between the lower rad hose and the waterpump inlet is steel.
gpx750r_cooling_system.gif
gpx750r_cooling_system.gif (41.11 KiB) Viewed 179 times

I guess the GPz900 would be mostly similar.
The corrosion inhibitors in coolant not only restrict the unwanted interaction between the differing metals in the cooling system, they are also supposed to stop the ethylene/propylene glycol from attacking stuff as well.

javaman wrote:I need to do/improve the cooling on my GPZ900R. 15 min in any traffic and it goes to the red zone. Have drained, change cap, etc. Which is funny as my aircooled 750 can sit in traffic all day no worries :?

Does the fan actually come on? If the fan is ok, the thermostat might not be opening enough or is stuck in one spot.
User avatar
Mister_T
KSRC Member
KSRC Member
 
Posts: 122
Joined: Sat Dec 12, 2015 10:18 am
Bike: GPx750
State: Victoria

Re: GPX750R resurrection

Postby javaman » Tue Mar 21, 2017 9:09 pm

Interesting. When I drained the coolant (twice now) I did not notice rust/brown colour. I still want to 'descale' the system though.

Yes the fan is comes on and also earlier (I did the 'disconnect oil temp sensor' mod) by about 10deg.

But albeit the fan on, temperature will climb to the red in city traffic. I have actually stopped 2 times to avoid overheating/warping.

I have read various mods e.g. manual fan switch which is easy to do. But no real concensus whether it fixes the problem it seems.

I do notice that the coolant pipes, hoses, etc are so close to the exhaust manifold in the order of 2-3mm! :shock: but there is no way to move them further. They are just so tight. It could be that the coolant is boiled when stopping in traffic.

There is absolutely no issues when the bike is moving. Always stay in the middle or 3/4 at worst.
alien.gif andi - Red ZX6R, R6, GPZ900R
"my dad's motorbike is cool it is all ways clean.oheter pepole' s motorbikes
are't like my dad's one it's because their is one not always clean."
-ariel circa 2007
http://GPZninja.blogspot.com/
User avatar
javaman
KSRC Contributor
KSRC Contributor
 
Posts: 2409
Joined: Sun Nov 21, 2004 8:39 pm
Location: Bonbeach, VIC
Bike: GPz900
State: Victoria

Re: GPX750R resurrection

Postby GPX Denis » Sat Jun 03, 2017 10:47 pm

Does anyone know if there is a fuel reserve on the GPX 750r fuel light comes on with 10 litres still in the tank haven't tried to run the tank dry or anything to test itmay cause blockages in carburetors etc cheees Denis
GPX Denis
Newbie
 
Posts: 10
Joined: Wed Jan 13, 2016 6:57 pm
Bike: GPx750
State: Victoria

Re: GPX750R resurrection

Postby Mister_T » Sun Jun 04, 2017 11:01 pm

GPX Denis wrote:Does anyone know if there is a fuel reserve on the GPX 750r fuel light comes on with 10 litres still in the tank

Mine does not work but the owners manual says the light comes on when there is 4 litres left.
User avatar
Mister_T
KSRC Member
KSRC Member
 
Posts: 122
Joined: Sat Dec 12, 2015 10:18 am
Bike: GPx750
State: Victoria

Previous

Return to GPX & GPZ Discussion

Who is online

Users browsing this forum: No registered users and 1 guest

cron