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650 SR Starting Problem:
- twjoyce
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If I kick it a few times and play with where the choke is, it starts after a bit and after it warms up it starts fine with the starter. Also, if it has been sitting out in the hot sun, it starts fine either way. I had one of these new and this is the 4th used one I have had so I know a little bit about them but I have never had one that did this. The guy I bought it from said the carbs had all been cleaned and adjusted last year. I don't know the guy but he seemed to know his stuff and be a good guy.
Anyway, any ideas on what I need to do to get a good cold start with the starter (I'm gettin a little old to kick it all the time) would really be appreciated.
Thanks, Tom
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- twjoyce
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- cobura
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- forever 2 wheels
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1979 KZ650B3
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- twjoyce
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- cobura
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- forever 2 wheels
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- RetroRiceRocketRider
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- ...bring in the machine that goes PING!
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- twjoyce
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- RonKZ650
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The bike runs perfect with tons of power. Ifit had bad compression, spiining it over faster with the starter would HELP
Well that's true, but you also need compression to get vacuum to get fuel into the engine to start. Much more difficult to start a cold engine with low compression, than with good compression. Most my 650s are well worn with low compression and do not start well cold or after sitting for long periods.
321,000 miles on KZ's that I can remember. Not going to see any more.
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- Patton
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...will NOT start with the electric starter when cold (cranks fine but won't start).
If I kick it a few times and play with where the choke is, it starts after a bit and after it warms up it starts fine with the starter. Also, if it has been sitting out in the hot sun, it starts fine either way. I had one of these new and this is the 4th used one I have had so I know a little bit about them but I have never had one that did this...Anyway, any ideas on what I need to do to get a good cold start with the starter ....
Symptoms can result from weak battery, where starter is consuming power needed by ignition, whereby spark is weakened when cranking engine over with electric starter.
If not already done, would verify clean snug connections at battery terminals and at negative cable ground connection at rear of engine.
Would also compare voltage readings across battery terminals with readings at coil primaries, engine off, at idle, and at 4000 rpm, all to determine extent of voltage drop between battery and coil primaries. If voltage is dropping between battery and coil, the ignition is already weaker than optimal, and using the electric starter further weakens the ignition (spark).
Look for 12~13 vdc at battery with engine off and at idle, and 14+ vdc at 4000 rpm.
Good Fortune!
1973 Z1
KZ900 LTD
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