Bike won't start - help!

[JustcallmeMrT]

Hold it. If your coils happen to be the (green?) 3 Ω coils like mine the last thing you need is a relay. This whole relay hype crossed the Atlantic I'm afraid and I doubt there will be any advantages to speak of.

I'm running the 5 ohm coils.

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[paul G]

Made a big differance on my Z650

[JustcallmeMrT]

Well, think I found my issue.  Borrowed a compression tester and it's down to 110 psi on each cylinder, and should be 170 psi, correct? 

Something has definitely gone wrong.

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[deltarider]

Well, think I found my issue.  Borrowed a compression tester and it's down to 110 psi on each cylinder, and should be 170 psi, correct?

 
Don't panic. I myself never managed to succesfully do a compression test on my CB500. Outcome was always way too low. Moreover, not every compression tester is suitable for the job. Hence my oldfashioned way of testing. Thumb (or finger) over sparkplughole, let somebody kick the engine. Thumb blown of: compression is fine. Thumb still on the hole: compression not good. 

[tom400f]

Read through this thread a couple of times... can we recap/confirm a bit of history:
1. you were riding it regularly a decent distance
2. one day you walked up to the bike cold and it wouldn't start?
3. any spluttering/it tried to fire but couldn't get going? Or completely dead not even a cough?
4. it was a sudden and unexpected onset?
5. Re compression - does it "feel ok" on the kickstart (so empirical like deltarider is saying)? Unlikely that all cyls would suddenly report low values...

[hairygit]

Did you hold the throttle wide open with choke off doing the compression test?

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[JustcallmeMrT]

Read through this thread a couple of times... can we recap/confirm a bit of history:
1. you were riding it regularly a decent distance

Yes

[/quote]
2. one day you walked up to the bike cold and it wouldn't start? [/quote]

It became a bit harder to start over a couple of days, then no start at all.

[/quote]
3. any spluttering/it tried to fire but couldn't get going? Or completely dead not even a cough?  [/quote]

It does cough occasionally, and yesterday night randomly started up once but died as soon as I let the revs drop.  Wouldn't start again.

[/quote]
4. it was a sudden and unexpected onset? [/quote]

Harder to start over the course of 3-4 days.

[/quote]
5. Re compression - does it "feel ok" on the kickstart (so empirical like deltarider is saying)? Unlikely that all cyls would suddenly report low values...
[/quote]

Feels fine via kicking it over - I haven't noticed a change.

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[JustcallmeMrT]

Did you hold the throttle wide open with choke off doing the compression test?

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Not WOT... will re - test.

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[hairygit]

Throttle needs to be wide open, needs air to go into the cylinders in order to compress!

[JustcallmeMrT]

Throttle needs to be wide open, needs air to go into the cylinders in order to compress!

With no choke and WOT I get 130 - 135 psi per cylinder.

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[JustcallmeMrT]

Try draining the float bowls, unlikely but possible they could have water in them. When I was syncing carbs I'd have a small bottle full of petrol suspended from the bars, the petrol was a known quantity then not something that may have been contaminated in the tank. I used a 2 stroke tank off a small Yamaha as they have spouts on the bottom so easy to get a fuel line on them.

Drained them yesterday... Unfortunately no luck.

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[JustcallmeMrT]

Well, it's running again.  I was wracking my brain for anything I'd done differently before it all went wrong and realised I'd topped off the tank with premium instead of my usual regular petrol.  In an off chance I got a jerry can of regular, drained the carbs and hooked up an auxiliary tank, and it fired second kick.  Started 5 more times after that, so hopefully problem solved.  Still doesn't make any sense though.

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[hairygit]

Some garages do sell dodgy or contaminated fuel, and supermarket garage seem to be the worst offenders. I have also known fuel delivery tankers put fuel in the wrong storage tanks, ie. Petrol in diesel tanks....  Glad it seems to be sorted!

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[Trigger]

Well, it's running again.  I was wracking my brain for anything I'd done differently before it all went wrong and realised I'd topped off the tank with premium instead of my usual regular petrol.  In an off chance I got a jerry can of regular, drained the carbs and hooked up an auxiliary tank, and it fired second kick.  Started 5 more times after that, so hopefully problem solved.  Still doesn't make any sense though.

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That is strange because it should of fired on easy start in that case.

[JustcallmeMrT]

Well, it's running again.  I was wracking my brain for anything I'd done differently before it all went wrong and realised I'd topped off the tank with premium instead of my usual regular petrol.  In an off chance I got a jerry can of regular, drained the carbs and hooked up an auxiliary tank, and it fired second kick.  Started 5 more times after that, so hopefully problem solved.  Still doesn't make any sense though.

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That is strange because it should of fired on easy start in that case.

Well, it won't start again this morning.  If someone offered me a damn moped in trade I'd have to consider it at this point.  I'm done.

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