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Possible spark plug or battery or voltage stabilizer issue

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Possible spark plug or battery or voltage stabilizer issue

PostAuthor: Philbrown123 » Wed Jun 09, 2021 6:10 pm

Okay I had my bike started up yesterday and it fired up foot ran for a minute and then wouldn’t start back up but would pop after crank a couple times then nothing. So I re charged my battery and tried again. Battery voltage reads 12.4 with the key on and drops to 10/11v at crank. Neither plug has spark at the plug when grounded to the cylinder. I tested both wires and with the key on each one reads 12.04v and drops to 8/10v at crank. The batter is 24ah 350 cold crank amps. Did my plug just suddenly both foul at once? I hear the plugs click like they should be sparking but aren’t. I saw a voltage stabilizer mod on eBay would this help my situation? I know I have checked the manual and it says if both wires have voltage I should be good but it just seems odd both plugs fouled at once??
Bikes:
1982 Yamaha virago xv750
1985 Kawasaki eliminator 900
1980 Yamaha dt125 enduro
1999 Yamaha 250 dirt bike clone

Philbrown123
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Bike year & model: 1982 Yamaha virago 750
Sex: Male

Re: Possible spark plug or battery or voltage stabilizer iss

PostAuthor: faffi » Thu Jun 10, 2021 1:29 am

It is possible, but unlikely that both spark plugs failed at once. You could, just for a test, hook the coils up to the battery directly and see if the extra voltage is enough to create a spark. Also try with a different spark plug, just in case. If this helps, consider putting a relay in that will allow you to take power from the battery instead of running through the whole harness.
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faffi
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Bike year & model: Relevant machines for this forum:
Current: 2001 XVS650 Drag Star Classic
Former: 1982 XV750SE with XV1100 engine and electrics, XT600Z shock absorber, 18" Seca rear wheel
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Re: Possible spark plug or battery or voltage stabilizer iss

PostAuthor: Philbrown123 » Fri Jun 11, 2021 4:20 am

Okay so I pulled my carbs out and re check the
Last edited by Philbrown123 on Fri Jun 11, 2021 4:23 am, edited 1 time in total.
Bikes:
1982 Yamaha virago xv750
1985 Kawasaki eliminator 900
1980 Yamaha dt125 enduro
1999 Yamaha 250 dirt bike clone

Philbrown123
Junior Membership
Junior Membership
 
Posts: 17
Joined: Sat May 22, 2021 6:49 pm
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Bike year & model: 1982 Yamaha virago 750
Sex: Male

Re: Possible spark plug or battery or voltage stabilizer iss

PostAuthor: Philbrown123 » Fri Jun 11, 2021 4:20 am

Okay so I pulled my carbs out and re check the plugs the plugs are definitely acting up. The carbs seemed in order it I cleaned them all again anyways and re set the air screw to 2 turns out. I was able to get both plugs to spark but it seems like they sparked weak and late. Not sure what this is a symptom of but I’m going to order the voltage stabilizer and a parts bike. Jus in case it’s the tci or something crapping out the bike I’m getting is the same year and has a ton of good parts so I can start swapping out stuff and quit buying parts one at a time
Bikes:
1982 Yamaha virago xv750
1985 Kawasaki eliminator 900
1980 Yamaha dt125 enduro
1999 Yamaha 250 dirt bike clone

Philbrown123
Junior Membership
Junior Membership
 
Posts: 17
Joined: Sat May 22, 2021 6:49 pm
  Flag
Bike year & model: 1982 Yamaha virago 750
Sex: Male

Re: Possible spark plug or battery or voltage stabilizer iss

PostAuthor: faffi » Thu Jun 17, 2021 1:27 am

That should make trouble-shooting a lot easier.
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faffi
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Posts: 3258
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Joined: Sun Feb 15, 2015 3:11 pm
Location: Norway Flag
Bike year & model: Relevant machines for this forum:
Current: 2001 XVS650 Drag Star Classic
Former: 1982 XV750SE with XV1100 engine and electrics, XT600Z shock absorber, 18" Seca rear wheel
Sex: Male



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