Help get the GPz going

[Oblivion]

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.]

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

[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.

[Oblivion]

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]

...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]

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]

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]

Blow down the carb bowl vent hose

[actungbaby]

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]

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 :laugh:

[actungbaby]

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 :laugh:

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

[jellywrestler]

is there motion lotion in the carb bowls?

[The Pastor]

whats the air filter like?

[Oblivion]

whats the air filter like?

Looks pretty much like brand new. No clogging that I can see, and blowing through it it seems clear too.

[jellywrestler]

Looks pretty much like brand new. No clogging that I can see, and blowing through it it seems clear too.

my question too hard?

[HenryDorsetCase]

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

Thats fine except if they are NC30 plugs which cost between $20 an d$40 each depending where you buy them.

But yes.

[Katman]

Thats fine except if they are NC30 plugs which cost between $20 an d$40 each depending where you buy them.

But yes.

If we're still talking about the GPZ the plugs will be NGK D8EA.

About $7.00 each.

[ducatilover]

If we're still talking about the GPZ the plugs will be NGK D8EA.

About $7.00 each.

$5 for NGK ones (unless you shop at REPCO, then you deserve the rip off :shifty: )

[Oblivion]

is there motion lotion in the carb bowls?


Edit; LOL Fail.

Yes there is, and it is going from the bowl to the chamber. But I think that it might be getting vlocked somehwere though. Since I'm getting no rev response. BUt that could be an electrical problem. I'll wait till i can get new sparkies in and check the coils. After that its the carbs.

As Akzle said, something could be wrong with the sliders.

[Oblivion]

$5 for NGK ones (unless you shop at REPCO, then you deserve the rip off :shifty: )

Who goes to Repco..... :blink:


If we're still talking about the GPZ the plugs will be NGK D8EA.

About $7.00 each.

Yeap DPR8EA is whats in there at the moment. If I remember correctly, they're something like 6$ at the Super Cheap in town.

And they're DPR8EA-9.

[Katman]

Who goes to Repco..... :blink:



Yeap DPR8EA is whats in there at the moment. If I remember correctly, they're something like 6$ at the Super Cheap in town.

And they're DPR8EA-9.

The correct plug for your bike is D8EA.

[Oblivion]

The correct plug for your bike is D8EA.

:blink: Good thing I haven't bought any yet. Would be a shame if I fitted the wrong plugs. :laugh:

[ducatilover]

DPR8EA-9 is fine, that's just pre-gapped to .9mm with a "protecting insulator" and resistor type :yes: but I'd bet the standard D8EA are cheaper (FWIW, the GN runs D8EA, how exciting!)

[Katman]

DPR8EA-9 is fine, that's just pre-gapped to .9mm with a "protecting insulator" and resistor type :yes: but I'd bet the standard D8EA are cheaper (FWIW, the GN runs D8EA, how exciting!)

Why would you use any plug other than the one the manufacturer specifies if the correct one is readily available?

[Akzle]

Why would you use any plug other than the one the manufacturer specifies if the correct one is readily available?

because it's summer/winter/you're running it lean/cold/hot/rich....(irrespectively)

[ducatilover]

because it's summer/winter/you're running it lean/cold/hot/rich....(irrespectively)


Why would you use any plug other than the one the manufacturer specifies if the correct one is readily available?

Ask the fella who put 'em in there, otherwise what Akzle sez.
I've had to move to different plug temps before.
But in this case, if he finds it easier to get something other than a D8EA, then why not?

[actungbaby]

$5 for NGK ones (unless you shop at REPCO, then you deserve the rip off :shifty: )

Mine are 25 each and need 4 bloody hell special ones apprently made for honda aghhh

[Oblivion]

Right, so we had a wee poke around trying to get the thing to work.

Firstly, the loom was fucked. Splice wiring everywhere, with dodgy connections too. Fixed that with Solder and heatshrink.

Then we moved onto getting the thing started. Every time it turned over, we had fuel on the plugs. So fuel is getting in there. WE tested the plugs, and got either no spark, or very weak spark. So we tested the pickup coil, and got a spark off the plug. A few big ones, and alot of average ones.

And then it started going to shit. No spark whatsoever. So we decided to give up before we fucked it. (We had flaming backfire :laugh: )

But I'm thinking that the ignition coil input voltage is way too low.

But then again, there's only so much you can do without a multimeter.

[Katman]

So have you replaced the plugs yet?

[Oblivion]

So have you replaced the plugs yet?

We used one new one. To test with, and we still had the same problem with the new one as the old one.

Edit; Which is a weak spark, to clarify.

[Katman]

We used one new one. To test with, and we still had the same problem with the new one as the old one.

Edit; Which is a weak spark, to clarify.

The internet is mixture of helpful people who know fuck all and those who offer occasional good advice.

Do yourself a favour and learn to tell the difference.

Replace the plugs as a set.

[Flip]

The internet is mixture of helpful people who know fuck all and those who offer occasional good advice.

Do yourself a favour and learn to tell the difference.

Replace the plugs as a set.

I don't often agree wirh Kartman, but in this case do what he suggested.

[FJRider]

The internet is mixture of helpful people who know fuck all and those who offer occasional good advice.

Do yourself a favour and learn to tell the difference.

Replace the plugs as a set.

I guess he tested the spark with a new plug. Found a weak spark ... and decided that replacing the entire set with new plugs would not solve the problem. :calm:

And I'm inclined to agree ... ;)

[jellywrestler]

I guess he tested the spark with a new plug. Found a weak spark ... and decided that replacing the entire set with new plugs would not solve the problem. :calm:

And I'm inclined to agree ... ;) so what is a 'weak' spark and how does he know? A spark from a dirty plug outside a bike is a lot different to a spark from a dirty plug in place with all the dynamics going on in a cylinder.

[FJRider]

so what is a 'weak' spark and how does he know? A spark from a dirty plug outside a bike is a lot different to a spark from a dirty plug in place with all the dynamics going on in a cylinder.

But he tested with a new plug. Not a dirty one. The decision not to replace the set was his. As was the decision the spark was weak.

[jellywrestler]

But he tested with a new plug. Not a dirty one. The decision not to replace the set was his. As was the decision the spark was weak.

i realise he used a new plug my point was the 'new' plugs spark may look the same when out the bike as the old dirty plug but that could be a different case once in the bike with all the added things that make it hard for a plug to fire inside and with four new plugs one or two may fire enough to get the whole electrical system back to its normal voltage and a 'stronger' spark helps the others out.

[FJRider]

i realise he used a new plug my point was the 'new' plugs spark may look the same when out the bike as the old dirty plug but that could be a different case once in the bike with all the added things that make it hard for a plug to fire inside and with four new plugs one or two may fire enough to get the whole electrical system back to its normal voltage and a 'stronger' spark helps the others out.

Being the free country this is ... he is allowed to make the decision not to replace the set. The advice to replace the full set to eliminate a potential problem is valid ... for a number of reasons ... but it is still HIS decision. If he believes he is qualified to make that decision ... who are we to argue ... ???

[Oblivion]

The internet is mixture of helpful people who know fuck all and those who offer occasional good advice.

Do yourself a favour and learn to tell the difference.

Replace the plugs as a set.

I appreciate the advice that all of you have given. I have tried everything that everyone has suggested. I know you all are only trying to help me here.

I went out today and got a new set of D8EA regardless. And also spent time checking every wire that I could find for the ignition system for corrosion and cleaning it off. And well and behold it starts. Spluttered, for a bit, since there was alot of excess fuel in the cylinder from so many failed starts.

Thanks for all of the help.

[Katman]

I guess he tested the spark with a new plug. Found a weak spark ... and decided that replacing the entire set with new plugs would not solve the problem. :calm:

And I'm inclined to agree ... ;)

Remind me not to get you to fix my bike when it breaks down.

[Akzle]

I appreciate the advice that all of you have given. I have tried everything that everyone has suggested. I know you all are only trying to help me here.

:killingme :rofl:
. .