GPZ900R troubles

I realised today that I hadn't started my GPZ900R in a couple of
months, so I gave it a try and flattened the battery.

After giving it a few hours of charging and much cranking it started,
but was only running on the leftmost 2 cylinders (i.e. the sidestand
side). I switched it off and thought about the situation for a while,
put the bike on the centrestand and voila - it started as soon as I
touched the button and ran on all 4 cylinders.

I'm suspecting that I have a problem with either carburettor float
heights or the fuel plumbing between the tank and the carbies. Does
anyone have any other ideas as to where I might profitably probe?

I'm also thinking that this means that the nice bloke who charged me
$1100 for servicing earlier this year didn't probe anywhere nearly as
deep into the fuel system as he said he did...


BTH

 

[shrug] I'd drain the carbs and check the tap for grunge and the vacuum-line
for leaks and then probably give up and go watch TV.

 

what's going on, Clem? not even a vague reference to his cranking?

http://tinyurl.com/6dy6pk

Nev..
'07 XB12X

 

It's a classic problem with these bikes.

 

Heh heh; I'm feeling guilty since he was so kind as to offer me the GPZ when
the Trumpy shit itself.

 

Update:

Today I went to take it for a test ride (prior to heading off to
Thredbo tomorrow), and from start-up it was only running on 3
cylinders (actually more like 2.75 - #1 wasn't firing at all, and #4
had a weak spark).

Since both the #1 and #4 cylinders are driven from the same coil, I
replaced it with a used one from a GPz750 ($40) and new plug leads and
caps ($5 each). It's running much better now, although I'll bet that
the fuel starvation issue will still be hanging around.

I suppose you've got to expect these type of things from high-mileage
23-year-old bikes though.


BTH

 

Not when they are Japanese. : )

Fraser