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Makotosun
1972 won’t start-do I need a battery ?
- MarkT
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Replied by MarkT on topic 1972 won’t start-do I need a battery ?
Don't worry about all the wires. You could unplug everything but the black (sometimes black/white) that connects the points to the coil. If you have spark, you've got the wiring right. None of the other wires have anything to do with it running.
If you have the flywheel key in and max point gap at 0.013" then timing is probably not correct but should be close enough to run.
Make sure spark plug is gapped 0.020" to 0.024" and as was previously mentioned sometimes plug will fire outside the engine but not under compression. Try a different plug. Sometimes even new plugs are bad
Could just be flooded too.
If you have the flywheel key in and max point gap at 0.013" then timing is probably not correct but should be close enough to run.
Make sure spark plug is gapped 0.020" to 0.024" and as was previously mentioned sometimes plug will fire outside the engine but not under compression. Try a different plug. Sometimes even new plugs are bad
Could just be flooded too.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
22 May 2023 22:01
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- Ht1kid
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Replied by Ht1kid on topic 1972 won’t start-do I need a battery ?
Those wires look good is it a new spark plug did you use a keyster carb rebuild kit. Is your spark plug wet?
Sorry MarkT typing same time
Sorry MarkT typing same time
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- RT325
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Replied by RT325 on topic 1972 won’t start-do I need a battery ?
Yep my guess is flooded.
But on the other hand it could've pushed out a crank seal. Left side [if it can get out past the stator plate] will just let air in.
Right side will let the transmission oil in. But won't run regardless if one or other are fully out.
Crank key ok for the flywheel [determines if the timing is in the ball park].
If its flooded plug will be wet. Mind you be wet too if right side seal is letting oil in--so oil wet & probably a lot of compression on the kickstart with extra oil compressing.
But on the other hand it could've pushed out a crank seal. Left side [if it can get out past the stator plate] will just let air in.
Right side will let the transmission oil in. But won't run regardless if one or other are fully out.
Crank key ok for the flywheel [determines if the timing is in the ball park].
If its flooded plug will be wet. Mind you be wet too if right side seal is letting oil in--so oil wet & probably a lot of compression on the kickstart with extra oil compressing.
22 May 2023 22:17
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- Srk97001@gmail.com
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Replied by Srk97001@gmail.com on topic 1972 won’t start-do I need a battery ?
Interesting point about the seals...I replaced both sides with new as i did have a clutch side leak that filled the crank with oil over 10 years. I actually got the bike to fire up for ~3 seconds or so on starter fluid 2nd kick after rebuild, then i completed the bike and it never fired up again. Compression is 110 psi, with newly honed cylinder, piston, and rings, that have not seated yet. Piston is not wet with any clutch oil when inspected though the intake and exhaust ports.
Ill inspect the seals, strangest thing is that i felt really good after i got it fired, but then never fired up again after that 1 time, no visible damage to piston and compression is 110 psi. Anyone else have something like this happen?
Ill inspect the seals, strangest thing is that i felt really good after i got it fired, but then never fired up again after that 1 time, no visible damage to piston and compression is 110 psi. Anyone else have something like this happen?
23 May 2023 08:53
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- darinm
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Replied by darinm on topic 1972 won’t start-do I need a battery ?
If you're getting spark with the plug removed and it's not firing I'd disconnect the ignition switch, replace the plug and inspect/cut back both ends of the wire between the coil and spark plug boot, to make sure it's getting a good solid connection from the coil. Or just replace it and the spark plug boot if it's original, they are pretty cheap.
Flooding should be visible on the plug after attempting to start it and pulling the plug.
Flooding should be visible on the plug after attempting to start it and pulling the plug.
1972 Yamaha CT2 175
1972 Suzuki TS185 Sierra
1997 BMW R1200R
2009 BMW X-Country 650
2013 Yamaha XT250
1972 Suzuki TS185 Sierra
1997 BMW R1200R
2009 BMW X-Country 650
2013 Yamaha XT250
23 May 2023 11:44
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- RT325
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Replied by RT325 on topic 1972 won’t start-do I need a battery ?
Still wondering if the flywheel key let go just before you stopped it. Still think you'd get a fart or an explosion & even blow the exhaust off at the port--or try to.
Original oil in the crankcase would 'usually' be the oil tank gravity feeding in--but maybe not in your case.
I've never done it but wonder if you could blow compressed air in the breather on the transmission & 'with the reed block out' listen for air entering the c/case. Or if ya gentle with the air & stop start to see if its pressurizing the trans & coming back out the breather which confirms the seal is in place.
I'm over complicating it.
Check flywheel key.
Original oil in the crankcase would 'usually' be the oil tank gravity feeding in--but maybe not in your case.
I've never done it but wonder if you could blow compressed air in the breather on the transmission & 'with the reed block out' listen for air entering the c/case. Or if ya gentle with the air & stop start to see if its pressurizing the trans & coming back out the breather which confirms the seal is in place.
I'm over complicating it.
Check flywheel key.
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- Ht1kid
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Replied by Ht1kid on topic 1972 won’t start-do I need a battery ?
Have you tried any of our suggestions if so what I see you said you rebuilt your carb did you use the keyster brand more pictures or video would help
stator, coil and spark plug pictures
stator, coil and spark plug pictures
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- Srk97001@gmail.com
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Replied by Srk97001@gmail.com on topic 1972 won’t start-do I need a battery ?
I have tried many of the suggestions, I did a carb rebuild with the keester rebuild kit, and I have a spare carburetor I bought on eBay, both with the same results. I have tried two different spark plugs I replaced the ignition coil I reinspected my magneto side seal, which is still in the same spot I put it when I replaced it, and I did a vacuum hold check on the clutch side and it held vacuum for over three minutes. I used the dial indicator to find top dead center and noticed it was very far out of alignment with the mark on the rotor and stator. I marked the rotor with where the stator line was just so you could see it in the picture. I did notice that my point “ foot” (part that drags in the cam) looks really worn down compared to a new one. Could that have anything to do with this? Open to othe suggestions.. keep them coming
23 May 2023 21:50
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- MarkT
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Replied by MarkT on topic 1972 won’t start-do I need a battery ?
I'm just curious how the heck you do a "vacuum hold check on the clutch side"?
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
23 May 2023 22:01
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- RT325
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Replied by RT325 on topic 1972 won’t start-do I need a battery ?
i guess you proved it has good sprocket & kick start seals too, & oil pump seal, & pushrod seal [what else have i forgotten] & crank seal--via the breather tube. I can't talk--i'm useless & i've never done a vacuum test'--or a pressure test for that matter.
Anyway--looking at the pics i'll go check some google images but just looks wrong to me like the stator plate is miles around anticlockwise.
From what i can see expanding the pics it looks way around just referencing the part of the crankcase i can make out.
I must be wrong--i'll go looking. Think my 250 mark is way back around clockwise.
Ignore if i'm dreaming--i know yours is a 175 looking at the flywheel.
Can i just add--expanding the pic it looks like the crank seal is a long way in past flush. I guess that's the least of the problems at the moment so don't dwell on it.Hopefully not touching the cage & plenty of oil mix in there. Or im not seeing it quite as it is on my computer.
Anyway--looking at the pics i'll go check some google images but just looks wrong to me like the stator plate is miles around anticlockwise.
From what i can see expanding the pics it looks way around just referencing the part of the crankcase i can make out.
I must be wrong--i'll go looking. Think my 250 mark is way back around clockwise.
Ignore if i'm dreaming--i know yours is a 175 looking at the flywheel.
Can i just add--expanding the pic it looks like the crank seal is a long way in past flush. I guess that's the least of the problems at the moment so don't dwell on it.Hopefully not touching the cage & plenty of oil mix in there. Or im not seeing it quite as it is on my computer.
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