Help get the GPz going

**Oblivion** · 12th September 2012, 19:07

Right, So the GPz at the moment is not running, And I would like it up and running so I can do my full on it. (I would have done it today if the indicators on the GN hadn't packed up and stopped working.WHEN THEY WERE WORKING THAT MORNING. Was not a happy chappy after that)

Right, so it goes like this. Was running when we picked it up. I went for a small pootle around on it before we loaded it up on the trailer. Since then its pretty much been stored in the garage, and I would take it out 2x every week or so and just do U turns out the front of our house, or just fire it up and let it run to keep the charge in the battery and what not. Would smoke on start up, but the previous owner said that it smoked due to lack of use.

It idled low, but we changed the mixture, and it ran perfect. Around 3 days after that, it started backfiring. Horrendously. It would start up, run for a bit without a problem, then die straight after it backfired. Rinse and repeat. Then it wouldnt start at all. I pretty much left it like that until now. Until today, when I cleaned the plugs.

Things that have been done.

The carbs have been fully rebuilt.
The spark plugs have been cleaned as they were pretty much black and horrid. There is a small spark between the points.
New Petrol ( Old petrol removed)
Recent oil (around 100ks old)
Checked fuel lines from tank to carb, clean
Check fuel getting into the chamber, Fuel does get into the chamber.

Now it does "start" but it still backfires and dies. Better yet, I cannot get a throttle response from it. As in turning the throttle doesnt do anything. It wont rev or anything.

Would preferably like to get it running by my own hands, for experience and what not, so some makeshift diagnosis would be great help.

Cheers.

PS, Me cleaning them still doesnt mean that they're perfect. So they could still be the problem.

**DEATH_INC.** · 12th September 2012, 19:10

Replace the plugs, cleaning modern plugs doesn't do shit.
Then check the coils.

**Katman** · 12th September 2012, 19:57

As Death says, the plugs are fouled. Replace them.

Repeatedly starting the bike and only running it for a very short period of time is doing more harm than good.

**Oblivion** · 12th September 2012, 20:03

As it turns out, I have an allen key too big, and too small for the bolt. Just not the one just right. So taking off the coil cover is tomorrows job along with new plugsr spark plugs, Ill take one off for reference and get a brand new set tomorrow. And get a multimeter from Dad.

**Akzle** · 12th September 2012, 20:07

Originally Posted by Oblivion

...Better yet, I cannot get a throttle response from it. As in turning the throttle doesnt do anything. It wont rev or anything.

if the carbs have been reBUILT shit should be clean. make sure it is.
as others - nu plugs, check coil resistance/CDI.
if it's not revving check that the throttle slides are moving - if not, fix it. if yes - you've probably got a vacuum leak cylinder side.

**Oblivion** · 12th September 2012, 20:08

Originally Posted by Katman

As Death says, the plugs are fouled. Replace them.

Repeatedly starting the bike and only running it for a very short period of time is doing more harm than good.

The only problem I had was being legal to ride it. Dad has his motorcycle license but doesnt ride anymore after having a rod put in his arm after a motorcycle accident. If he crashes again, his arm is good as gone. And I only have my restricted. Its a LAMS bike, so It's all go from the first. It just needs to run first. Then I'll take it for a wind out on the back streets. After warrant and rego of course.

**Oblivion** · 12th September 2012, 20:17

Originally Posted by Akzle

if the carbs have been reBUILT shit should be clean. make sure it is.
as others - nu plugs, check coil resistance/CDI.
if it's not revving check that the throttle slides are moving - if not, fix it. if yes - you've probably got a vacuum leak cylinder side.

Wont it need to start for you to test for a vacuum leak?. Because you are spraying something like WD40 around the carb boots, and watching for a RPM increase.

I will do that after it starts though. Better safe than sorry, and a can of WD40 is cheap. The boots look relatively new, so hopefully it would be a simple case of just tightening them.

**ducatilover** · 12th September 2012, 20:21

Blow down the carb bowl vent hose

**actungbaby** · 12th September 2012, 21:35

Originally Posted by Oblivion

The only problem I had was being legal to ride it. Dad has his motorcycle license but doesnt ride anymore after having a rod put in his arm after a motorcycle accident. If he crashes again, his arm is good as gone. And I only have my restricted. Its a LAMS bike, so It's all go from the first. It just needs to run first. Then I'll take it for a wind out on the back streets. After warrant and rego of course.

U chould always find a track to ride it on what i used to do with mine when first got it running not road legal ;-) did have my licence though

I walk it on the foot path down to the river.

Other than that just keep working on it it whouldint have points it be cdi buddy, what engine size is it gpz 900 ?

or even closed car park but dont go nuts on it i stuck to second gear and learnt alot about the feel of my new bike going slow its good way to learn

Take your dad with you get him to teach you

**Oblivion** · 12th September 2012, 22:27

Originally Posted by actungbaby

U chould always find a track to ride it on what i used to do with mine when first got it running not road legal ;-) did have my licence though

I walk it on the foot path down to the river.

Other than that just keep working on it it whouldint have points it be cdi buddy, what engine size is it gpz 900 ?

or even closed car park but dont go nuts on it i stuck to second gear and learnt alot about the feel of my new bike going slow its good way to learn

Take your dad with you get him to teach you

Tis a 550. I have had a little run on it, but nothing big to get a taste of it. Handles way better than the GN. Maybe since it has rubber tires instead of plastic

**actungbaby** · 13th September 2012, 12:34

Originally Posted by Oblivion

Tis a 550. I have had a little run on it, but nothing big to get a taste of it. Handles way better than the GN. Maybe since it has rubber tires instead of plastic

Oh the gbz 550 is sweet bike is it the dual shock or the moino shock model nice bud well i assume that under the lams rule change

In october this bike you be allowed to ride as a learner , gee they neat machine used rav over them in american magizine id whould read sweet.

being air cooled i whouldint ride to slowley for hours as get bit hot mind you , you be able to tell if it is

Is it the red model