Need electrical help...I'm dying here!!!
Moderator: rztom
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- Posts: 60
- Joined: Wed Jul 12, 2017 3:34 pm
- Location: Virginia
Need electrical help...I'm dying here!!!
Bike was running great but needed to fix first gear in the transmission.
Pulled stator to get the transmission cassette out, replaced the gear cluster and installed new shift forks. put everything back together.
start the bike and the lower cylinders are running fine but the top cylinders are missing and farting and weak exhaust output.
new plugs....same
swapped coils....same
swapped orange and black wires from upper coil to lower coil and vice versa.....same
different plug wires on upper cylinder....same
Ohms on pick up leads checked out ok
Ohms on windings were alittle high, but barely
has a 4 degree key on the crank, switched it forwards and backwards.....same
tried a backup cdi.....same
I'm out of options and miserably frustrated....... Any magical suggestions???
Pulled stator to get the transmission cassette out, replaced the gear cluster and installed new shift forks. put everything back together.
start the bike and the lower cylinders are running fine but the top cylinders are missing and farting and weak exhaust output.
new plugs....same
swapped coils....same
swapped orange and black wires from upper coil to lower coil and vice versa.....same
different plug wires on upper cylinder....same
Ohms on pick up leads checked out ok
Ohms on windings were alittle high, but barely
has a 4 degree key on the crank, switched it forwards and backwards.....same
tried a backup cdi.....same
I'm out of options and miserably frustrated....... Any magical suggestions???
- Rick Lance
- Posts: 366
- Joined: Thu Nov 17, 2005 11:12 am
- Location: Leicester, NC
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Re: Need electrical help...I'm dying here!!!
Did you paint anything while the motor was out? You may have a bad ground. Try running a dedicated ground wire from the stator cover to the upper and lower coils.
If I disagree with everyone, that doesn't make me right. If I take the side of only one, it doesn't end the fight. If my position's strong enough from exposure to the light, you may see things my way when we share the same highway.
Re: Need electrical help...I'm dying here!!!
How long was the bike sitting, I would clean the carbs out, They might be gummed up from sitting, The ethanol is awful if you leave the bike sitting any length of time with ethanol blocker in the gas..
1985 RZv500
1984 RZ500 Hybrid
1986 RG500 Walter Wolf
1986 RG500 Skoal Bandit
1984 RZ350
1984 RZ350 Hybrid
1981 RD350LC
1981 RD350LC Hybrid
2009 CR500AF Supermoto 250X
2007 CR500AF 250X
1988 YSR50 (2)
1989 VFR750R RC30
1984 GPZ750 Turbo
1984 RZ500 Hybrid
1986 RG500 Walter Wolf
1986 RG500 Skoal Bandit
1984 RZ350
1984 RZ350 Hybrid
1981 RD350LC
1981 RD350LC Hybrid
2009 CR500AF Supermoto 250X
2007 CR500AF 250X
1988 YSR50 (2)
1989 VFR750R RC30
1984 GPZ750 Turbo
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- Posts: 60
- Joined: Wed Jul 12, 2017 3:34 pm
- Location: Virginia
Re: Need electrical help...I'm dying here!!!
The bike was only down three days and ran perfect before pulling the transmission.tacky1 wrote:How long was the bike sitting, I would clean the carbs out, They might be gummed up from sitting, The ethanol is awful if you leave the bike sitting any length of time with ethanol blocker in the gas..
Re: Need electrical help...I'm dying here!!!
As you pulled the transmission the clutch must have been off. Crazy question but have you double checked the cranks are in phase. The front crank has the rotor on it so would not be effected, not so with the rear crank and one gear tooth out could give the problems you describe.
If above OK try the carbs.
Regards
Paul
If above OK try the carbs.
Regards
Paul
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- Posts: 60
- Joined: Wed Jul 12, 2017 3:34 pm
- Location: Virginia
Re: Need electrical help...I'm dying here!!!
To pull the trans cassette you only take off the two nylon gears and the kick start gear, so both cranks never get changed or touched... These are on the clutch side of the bike.Paulrs wrote:As you pulled the transmission the clutch must have been off. Crazy question but have you double checked the cranks are in phase. The front crank has the rotor on it so would not be effected, not so with the rear crank and one gear tooth out could give the problems you describe.
If above OK try the carbs.
Regards
Paul
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- Posts: 60
- Joined: Wed Jul 12, 2017 3:34 pm
- Location: Virginia
Re: Need electrical help...I'm dying here!!!
Problem solved.... With the clutch basket off one crank can turn freely.... and I moved mine, unknowingly. Why I decided to check it I'll never know, but it was off....set it back where it should have been and it fired on the second kick and sounds wonderful.....
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- Posts: 60
- Joined: Wed Jul 12, 2017 3:34 pm
- Location: Virginia
Re: Need electrical help...I'm dying here!!!
You were right....I didn't realize it until I rechecked....I never would have believed it!!!Paulrs wrote:As you pulled the transmission the clutch must have been off. Crazy question but have you double checked the cranks are in phase. The front crank has the rotor on it so would not be effected, not so with the rear crank and one gear tooth out could give the problems you describe.
If above OK try the carbs.
Regards
Paul
Re: Need electrical help...I'm dying here!!!
So, you mean that you swapped plugs, coils, wires, CDI, ... without checking if you had sparks ?
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- Posts: 60
- Joined: Wed Jul 12, 2017 3:34 pm
- Location: Virginia
Re: Need electrical help...I'm dying here!!!
No, I had spark...that's what was driving me crazy..... It missed badly, popped and weak exhaust pressure. The rear cylinders were firing when the pistons were NOT at TDC. The crank turned out of time when I had the clutch basket off...
Re: Need electrical help...I'm dying here!!!
You have to pull the clutch to get the gearbox out, The clutch main nut is on the end of the gearbox shaft, Are you sure the cranks are timed correctlythumper580 wrote:To pull the trans cassette you only take off the two nylon gears and the kick start gear, so both cranks never get changed or touched... These are on the clutch side of the bike.Paulrs wrote:As you pulled the transmission the clutch must have been off. Crazy question but have you double checked the cranks are in phase. The front crank has the rotor on it so would not be effected, not so with the rear crank and one gear tooth out could give the problems you describe.
If above OK try the carbs.
Regards
Paul
EDIT: Sorry, I see you fixed the prob
1985 RZv500
1984 RZ500 Hybrid
1986 RG500 Walter Wolf
1986 RG500 Skoal Bandit
1984 RZ350
1984 RZ350 Hybrid
1981 RD350LC
1981 RD350LC Hybrid
2009 CR500AF Supermoto 250X
2007 CR500AF 250X
1988 YSR50 (2)
1989 VFR750R RC30
1984 GPZ750 Turbo
1984 RZ500 Hybrid
1986 RG500 Walter Wolf
1986 RG500 Skoal Bandit
1984 RZ350
1984 RZ350 Hybrid
1981 RD350LC
1981 RD350LC Hybrid
2009 CR500AF Supermoto 250X
2007 CR500AF 250X
1988 YSR50 (2)
1989 VFR750R RC30
1984 GPZ750 Turbo
Re: Need electrical help...I'm dying here!!!
Yes, but you didn't say it and we thought that you hadn't sparks on them.thumper580 wrote:No, I had spark...that's what was driving me crazy..... It missed badly, popped and weak exhaust pressure. The rear cylinders were firing when the pistons were NOT at TDC. The crank turned out of time when I had the clutch basket off...
The only thing you said is that you swapped nearly everything in the rear cylinders ignition and, in fact, all that was useless cause ignition was good.
Never mind, you found it.
Re: Need electrical help...I'm dying here!!!
Which is completely harmless as the RD500 always fires all four plugs at once. So swapping them all around will always work.phildu31 wrote:So, you mean that you swapped plugs, coils, wires, CDI, ... without checking if you had sparks ?
Bye
Martin
Martin