Bike wont start have spark and compression.

the138crew · 12-02-2015, 02:23 PM

Good day all,

I have a 2000 gz250 that just wont start. Had an issue of no spark so I replaced the CDI and the pickup coil. Now I have good spark but the bike will not start at all. It has fresh gas, good compression right around 140PSI cold. Adjusted the valves and checked the timing marks on the cam gear and generator that seems to be dead on. I'm really lost on this one. I've sprayed starting fluid through the carb and nothing. If I put a huge gap in the spark plug it will backfire really hard. Any advise would be great. This is the first gz250 I've worked on.

I didn't see anywhere to adjust the pickup coil, am I missing an adjustment there for the timing? Is it possible for the generator to have slipped off the key and rotated on the shaft? I don't have the puller so havent been able to pull the generator to check. But I would think if the timing marks on the generator match the cam gear that is should not be the issue.

Thanks for any advise
JB

chandlerbingfl · 12-04-2015, 12:35 AM

Hmmmm...you have me stumped. If you have fuel, air and compression the only variable would be timing. I am far from an expert so I think that's the thing you need to focus on. There are way more knowledgeable people here so I hope they can help you more than I
Good luck and keep us posted!

chandlerbingfl

Quote:

Originally Posted by the138crew

Good day all,
I have a 2000 gz250 that just wont start. Had an issue of no spark so I replaced the CDI and the pickup coil. Now I have good spark but the bike will not start at all. It has fresh gas, good compression right around 140PSI cold. Adjusted the valves and checked the timing marks on the cam gear and generator that seems to be dead on. I'm really lost on this one. I've sprayed starting fluid through the carb and nothing. If I put a huge gap in the spark plug it will backfire really hard. Any advise would be great. This is the first gz250 I've worked on.

I didn't see anywhere to adjust the pickup coil, am I missing an adjustment there for the timing? Is it possible for the generator to have slipped off the key and rotated on the shaft? I don't have the puller so havent been able to pull the generator to check. But I would think if the timing marks on the generator match the cam gear that is should not be the issue.

Thanks for any advise
JB

Water Warrior 2 · 12-04-2015, 06:57 AM

Was the bike layed up for long?? Just a wild a$$ guess here but just maybe the carb dried out a bit and you need to put the fuel cock in "Prime" for a few seconds.

the138crew · 12-04-2015, 02:01 PM

The bike has fresh gas. I'm running it off a bottle feed at the moment. Is there any timing other then the cam timing? With the CDI controlling the spark, I don't know of any other timing to check.

raul10141964 · 12-04-2015, 04:28 PM

the alignment key on the flywheel sometimes brakes and the spark get out of time

12-02-2015, 02:23 PM	#1
the138crew Junior Member Join Date: Dec 2015 Posts: 2	Bike wont start have spark and compression. Good day all, I have a 2000 gz250 that just wont start. Had an issue of no spark so I replaced the CDI and the pickup coil. Now I have good spark but the bike will not start at all. It has fresh gas, good compression right around 140PSI cold. Adjusted the valves and checked the timing marks on the cam gear and generator that seems to be dead on. I'm really lost on this one. I've sprayed starting fluid through the carb and nothing. If I put a huge gap in the spark plug it will backfire really hard. Any advise would be great. This is the first gz250 I've worked on. I didn't see anywhere to adjust the pickup coil, am I missing an adjustment there for the timing? Is it possible for the generator to have slipped off the key and rotated on the shaft? I don't have the puller so havent been able to pull the generator to check. But I would think if the timing marks on the generator match the cam gear that is should not be the issue. Thanks for any advise JB Login or Register to Remove Ads
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12-04-2015, 06:57 AM	#3
Water Warrior 2 Senior Member Join Date: Dec 2006 Location: Squamish B.C Canada Posts: 11,409	Was the bike layed up for long?? Just a wild a$$ guess here but just maybe the carb dried out a bit and you need to put the fuel cock in "Prime" for a few seconds. Login or Register to Remove Ads
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12-04-2015, 04:28 PM	#5
raul10141964 Senior Member Join Date: Apr 2012 Location: Elkhart, Indiana Posts: 369	the alignment key on the flywheel sometimes brakes and the spark get out of time Login or Register to Remove Ads
	0

12-04-2015, 02:01 PM	#4
the138crew Junior Member Join Date: Dec 2015 Posts: 2	The bike has fresh gas. I'm running it off a bottle feed at the moment. Is there any timing other then the cam timing? With the CDI controlling the spark, I don't know of any other timing to check.
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