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July 6th, 2005, 01:35 PM   #1
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One spark plug per ride...?

Ok, it seems that I cannot start the bike well (or at all) unless I put a brand new spark plug, and then it starts.

I inspected the last spark plug, it was greyish. Used wire bruse to clean up, put it back, still did not work.

Put a brand new plug and braaam starts in one kick.

And this with both Champions and NGKs.

What could be the reason? Bad carburetion?

I won another FCR 39 on eBay and this one seems to be the right one (comes from a 2003 450 EXC), so I guess I'll say bye bye to the Dellorto.

From what I know about this bike's history, it's likely the carb is faulty.

Oops, did I attack Bob again?
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July 6th, 2005, 01:58 PM   #2
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you get that carb set up as per the owners doc and you'll be fine fella!

try to get it running right with the new carb then have a go at the dell orto. do it in that order fella please.

my bike improved when i found out that TDC was out by about 8d on the flywheel. one change at a time.

regards

taffy
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July 6th, 2005, 02:13 PM   #3
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If plug is really gray and not actually black wet fouled, sorry to say that the ignition is likely weak. All too many ignition problems get blamed on the carb.
dan
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July 6th, 2005, 02:16 PM   #4
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Faulty coil? Faulty stator?
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July 6th, 2005, 06:22 PM   #5
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I used to have the same problem when I used C8E plugs. Then after quite a while, thanks to Dale I tried CR8EK no more problems. That worked on my bike a 96 FE 501 but your bike is newer and the above would not work on your bike. I think it is a similar problem that could be solved in like fashion. Hope this gives you a idea.
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July 6th, 2005, 06:31 PM   #6
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Hard to say without some electric testing, but a lot of members have stator problems and it is usually the charge coils on the ignition side of the stator.
dan
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July 7th, 2005, 01:31 AM   #7
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Your ignition is weak if it goes with a new plug- what about trying a small plug gap maybe 10 thou to prove a problem- dont wire brush a plug to clean it even a proper plug cleaner will harm a plug you may get it working again in another motor otherwise chuck it
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July 7th, 2005, 11:06 AM   #8
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Never done that either... Sorry still learning here. How do I reduce the gap? What do you mean by 10?

Forgive the noob
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July 7th, 2005, 02:27 PM   #9
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NZ means .25mm using a feeler guage. to do it you gently tap the end of the plug on the kitchen table and it will close the gap a little.

the other way i do it is to put the feeler guage in the gap then tap the plug on the kitchen table.

you need more voltage to jump a bigger gap so it makes sense to drop the gap if you think the ignition is struggling.

that should do you nick!

regards

Taffy
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July 7th, 2005, 03:17 PM   #10
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I see... .25 = 1/10 of an inch... Thanks
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