Bike wonít start - Suzuki Z400 Forum : Z400 Forums
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post #1 of 19 (permalink) Old 10-08-2019, 03:40 PM Thread Starter
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Bike wonít start

Hello, we are new to this site

My brothers Suzuki is having an issue where it wonít ignition start, whenever we do the ignition slows down and it wonít start. It does roll start, and afterwards itíll continue to start if itís turned back on recently, however after leaving it off for a little while it refuses to start again. Weíve tried changing the spark plugs and upping the idle, but it doesnít seem to be the problem. It has an aftermarket HMF exhaust, air intake, rev limiter, and was jetted a while before the issue. We have not had a major issue like this for a long time and have kept upkeep on it, so itís been running fine.

Any help would be appreciated
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post #2 of 19 (permalink) Old 10-08-2019, 06:15 PM
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Weak battery?

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.
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post #3 of 19 (permalink) Old 10-08-2019, 08:46 PM Thread Starter
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No, Itís pretty new and we havenít had any issues with it
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post #4 of 19 (permalink) Old 10-08-2019, 10:42 PM
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What voltage is it reading? An aging starter can cause slow cranking, but it never gets any better. What youíre describing is a battery that wonít hold a charge for very long.

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.
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post #5 of 19 (permalink) Old 10-09-2019, 07:08 PM Thread Starter
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It read about 35V. We also tested the stator and starter motor which both read healthy resistance.
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post #6 of 19 (permalink) Old 10-09-2019, 07:40 PM Thread Starter
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We also just checked compression, and thatís not an issue either. Weíre gonna check the spark plug now, and then if thatís all good move onto the carbs
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post #7 of 19 (permalink) Old 10-09-2019, 08:57 PM Thread Starter
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Ok so here what weíve done thus far
- Test Battery
- Test Stator/Generator
- Test Regulator/Rectifier
- Test Spark Plug Terminal/Cap
- Test Starter Motor
- Check Compression (Without Gauge, used hand over spark plug hole, felt strong)
- Check Spark Plug Sparking/Gapping

Weíve yet to do these things that the Manuel said to check
- Check Carburator
- Check Valves

Really not much left to do except take it apart, if thereís something weíre overlooking, suggestions would be greatly appreciated
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post #8 of 19 (permalink) Old 10-09-2019, 09:29 PM
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Iím guessing you mean 13.5 volts, which is good. If itís 3.5v, then itís dead. Itís a 12 volt battery, so no way it would read 35v.

Check it again while cold (no start attempts that day) and while cranking. Let me know what you find.

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.
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post #9 of 19 (permalink) Old 10-10-2019, 09:28 PM Thread Starter
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Yep, it was 13.5v

While cold it was around 12.8v today, and while cranking it seemed to drop to 10.4v. Could be something I did but thatís what happened
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post #10 of 19 (permalink) Old 10-10-2019, 11:54 PM
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sounds like valves are out of spec. take off the cam cover and engine plugs. takes about 20 minutes to check the clearance. if its not valves then it is most likely a dirty carb or maybe it just needs to be rejetted
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post #11 of 19 (permalink) Old 10-11-2019, 11:32 AM
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Iíd call the battery good, so itís really a no-start problem. As mentioned, could be valve clearance, dirty carb, jetting, etc. I would check the valves first.

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.
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post #12 of 19 (permalink) Old 10-11-2019, 03:34 PM
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check the valves bet they are stretched real good

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post #13 of 19 (permalink) Old 10-11-2019, 04:21 PM Thread Starter
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Alright weíre gonna check the valves first. I know how to do it but is there anything tip or experience wise that would be of assistance. Anything helps
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post #14 of 19 (permalink) Old Yesterday, 04:21 PM Thread Starter
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Ok well Iíve opened it up, and judging from the videos Iíve watched the timing chain is off. Iím gonna still check the valve clearance
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post #15 of 19 (permalink) Old Yesterday, 05:16 PM Thread Starter
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Canít check the valves correctly until I fix the chain, and not only is the chain super tight, but covers for the camshaft refuse to come off. I donít wanna be rough with it so I donít break or lose anything
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