GZ250 exhaust backfire no start

gz4me + · 03-31-2014, 02:28 AM

I have a 2000 GZ250. The rectifier went up in smoke. I changed out the rectifier, stator, and pick-up coil. Now when I attempt to start it, all I get is exhaust backfire. It ran before I changed everything. Any thoughts??

alantf · 03-31-2014, 05:34 AM

Difficult over the internet, but it sounds like some kind of timing problem.

**jonathan180iq** · 03-31-2014, 09:39 AM

I agree with Alan.

Any more details? Anything at all rotate while you were changing out the stator?

gz4me + · 03-31-2014, 07:59 PM

Nothing rotated while changing stator. Timing is auto controled by the CDI. Trying to find information on testing it. I have been told that there is no way to test the CDI. Told to buy one and keep fingers crossed that solves the problem. I do not have that kind of money. Trying to find someone local who will allow me to put one on to see if it corrects the problem. Not many GZ's around. I have checked all the wiring connections and comfirmed good contact and connectors are locked in.

raul10141964 · 03-31-2014, 08:11 PM

the aliment key on the crank may be missing

gz4me + · 04-01-2014, 12:12 AM

Thanks, I will check on that. I was also advised to test the stator and make sure it was working. I had already done some basic test on it after the install. I will recheck that as well. Still trying to find a loner CDI. Negative results so far.

blaine · 04-01-2014, 01:05 AM

Quote:

Originally Posted by gz4me +

Thanks, I will check on that. I was also advised to test the stator and make sure it was working. I had already done some basic test on it after the install. I will recheck that as well. Still trying to find a loner CDI. Negative results so far.

The stator is part pf the charging system & has nothing to do with the bike starting.I kinda leaning towards flywheel key sheared off.

gz4me + · 04-01-2014, 05:15 AM

I agree with you and Raul. This makes alot of sense. I will be checking this out first. Thank you for your input and I will let you know what I find.

gz4me + · 04-09-2014, 01:57 AM

Sorry it took so long to get back with information. It took some time to find a 35mm flywheel puller. A local motorcycle shop was nice and pulled it for me. The flywheel key was not sheared. This shop owner went out of way to pull the flywheel and install it back on the bike at no charge to me. Hard to find someone like that these days. He thinks it is the CDI Box. Still searching for that. I will keep you updated as I continue to get this GZ going. MY Grandson has learned alot on this project and really hope we get it sarted soon.

gz4me + · 05-01-2014, 12:15 AM

Receieved CDI from E-Bay today. Installed it and have same problem. Exhaust backfire no start. It sounds like a 12ga. going off. Neighbor behind me called cops and reported gun fire. Two squad cars reported to my house and interrupted my work on bike. Funny after the fact, but not at the time. Anyone have any thoughts on what to check now???

03-31-2014, 02:28 AM	#1
gz4me + Senior Member Join Date: Sep 2013 Location: Santa Maria, California Posts: 234	GZ250 exhaust backfire no start I have a 2000 GZ250. The rectifier went up in smoke. I changed out the rectifier, stator, and pick-up coil. Now when I attempt to start it, all I get is exhaust backfire. It ran before I changed everything. Any thoughts?? Login or Register to Remove Ads
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03-31-2014, 05:34 AM	#2
alantf Senior Member Join Date: Nov 2008 Location: Tenerife (Spain) Posts: 3,719	Difficult over the internet, but it sounds like some kind of timing problem. __________________ By birth an Englishman, by the grace of God a Yorkshireman.
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03-31-2014, 09:39 AM	#3
jonathan180iq Super Moderator Join Date: Jan 2007 Location: Dalton, GA Posts: 3,996	I agree with Alan. Any more details? Anything at all rotate while you were changing out the stator? Login or Register to Remove Ads
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03-31-2014, 07:59 PM	#4
gz4me + Senior Member Join Date: Sep 2013 Location: Santa Maria, California Posts: 234	GZ250 exhaust backfire no start Nothing rotated while changing stator. Timing is auto controled by the CDI. Trying to find information on testing it. I have been told that there is no way to test the CDI. Told to buy one and keep fingers crossed that solves the problem. I do not have that kind of money. Trying to find someone local who will allow me to put one on to see if it corrects the problem. Not many GZ's around. I have checked all the wiring connections and comfirmed good contact and connectors are locked in.
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03-31-2014, 08:11 PM	#5
raul10141964 Senior Member Join Date: Apr 2012 Location: Elkhart, Indiana Posts: 369	the aliment key on the crank may be missing Login or Register to Remove Ads
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04-01-2014, 12:12 AM	#6
gz4me + Senior Member Join Date: Sep 2013 Location: Santa Maria, California Posts: 234	GZ250 exhaust backfire no start Thanks, I will check on that. I was also advised to test the stator and make sure it was working. I had already done some basic test on it after the install. I will recheck that as well. Still trying to find a loner CDI. Negative results so far.
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04-01-2014, 05:15 AM	#8
gz4me + Senior Member Join Date: Sep 2013 Location: Santa Maria, California Posts: 234	GZ250 exhaust backfire no start I agree with you and Raul. This makes alot of sense. I will be checking this out first. Thank you for your input and I will let you know what I find.
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04-09-2014, 01:57 AM	#9
gz4me + Senior Member Join Date: Sep 2013 Location: Santa Maria, California Posts: 234	Update on exhaust backfire, no sart problem. Sorry it took so long to get back with information. It took some time to find a 35mm flywheel puller. A local motorcycle shop was nice and pulled it for me. The flywheel key was not sheared. This shop owner went out of way to pull the flywheel and install it back on the bike at no charge to me. Hard to find someone like that these days. He thinks it is the CDI Box. Still searching for that. I will keep you updated as I continue to get this GZ going. MY Grandson has learned alot on this project and really hope we get it sarted soon.
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05-01-2014, 12:15 AM	#10
gz4me + Senior Member Join Date: Sep 2013 Location: Santa Maria, California Posts: 234	UPdate on GZ250 exhaust backfire no start. Receieved CDI from E-Bay today. Installed it and have same problem. Exhaust backfire no start. It sounds like a 12ga. going off. Neighbor behind me called cops and reported gun fire. Two squad cars reported to my house and interrupted my work on bike. Funny after the fact, but not at the time. Anyone have any thoughts on what to check now???
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