Date: 29-09-20  Time: 13:35 PM

Author Topic: Poor starting  (Read 898 times)

Wizard9956

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Poor starting
« on: 07 April 2020, 06:31:14 PM »
Hi, I bought my fzs600 2003 a few months ago with 13,800 miles on the clock, it was running poorly at low speed so I stripped and cleaned the carbs , and it then ran much better. Lately I’ve started having trouble starting from cold , it doesn’t fire straight away on no3 cylinder ( cold exhaust header ), after about 30 seconds of rough running no3 warms up and idles perfectly, and rides perfectly. Has anyone had this sort of fault , I’m tempted to blame the carb idle circuit, but shouldn’t it run poorly  when warmed up too.
Any ideas great fully received.


Cheers Wiz

BBROWN1664

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Re: Poor starting
« Reply #1 on: 07 April 2020, 07:37:21 PM »
Do you use the choke?
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redmandan

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Re: Poor starting
« Reply #2 on: 07 April 2020, 07:44:57 PM »
No 3 is a problem cylinder on my bike as well as many of the other guys on here. Problems can be but are not limited to:
  • Bike being parked on the side stand and water/debris sitting in the drain holes for that cylinder and then causing arcing from the spark plug to the cylinder head. Solutions include blasting out the drain holes with compressed air or if unavailable a bit of wire. Also if you have the original caps change for NGK and snip off 5mm of the HT lead.
  • Spark is weak on that plug - swap some plugs around and see if problem persists.
  • The bike has a wasted spark system whereby 1 and 3 spark together, even when 1 cylinder is on the exhaust stroke. You can thereby switch the caps from 1 and 3 and see if the problem persists. This eliminates a possible electrical/wiring problem

    There ends the easy solutions. If none of those work you are down to carb balancing, check the timing, possible piston wear. Or like me you can just accept that the bike runs alright as it is and not look too much further into it.
« Last Edit: 07 April 2020, 07:45:34 PM by redmandan »

Wizard9956

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Re: Poor starting
« Reply #3 on: 07 April 2020, 09:19:55 PM »
Thanks for the info , gives me some things to check . Will take a look at the drain holes
and try swapping the leads and see if the fault changes cylinder, although it runs well once warm , it is becoming a pain to start .

I do sometimes try using the choke , it’s a bit of a lottery , it either starts and revs as expected or it floods,
it’s the same with half choke .

Cheers Wiz
« Last Edit: 07 April 2020, 09:22:50 PM by Wizard9956 »

Wizard9956

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Re: Poor starting
« Reply #4 on: 07 April 2020, 09:24:19 PM »
Sorry about the text size , got a small phone and big fingers

darrsi

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Re: Poor starting
« Reply #5 on: 07 April 2020, 11:43:21 PM »
Is the battery in a good state, or could it need a boost?
Shouldn't need to use the choke at all in this warmer weather.
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Gnasher

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Re: Poor starting
« Reply #6 on: 08 April 2020, 08:58:22 AM »
I stripped and cleaned the carbs , and it then ran much better.

There is your problem, it's crab related.

Has anyone had this sort of fault , I’m tempted to blame the carb idle circuit, but shouldn’t it run poorly when warmed up too.

No, if it's running fine when warmed up.

Any ideas great fully received.

Providing the bikes running fine in all other respects, the issue is the cold start plunger on No3 crab.  Check that it's moving freely over all it's travel, that the link fork is correctly fitted in the plunger shaft rebate, or not bent/damaged.  These are almost never serviced, became dry and seize over time, there's a fair bit of play in the linkage/opening fork they can stick shut, choke effect doesn't work poor starting, or half open poor running at low revs when warm but fine higher revs.  The plunger unscrews as an assembly, often just a clean very light smear of grease and its sorted, that said they can suffer oxidisation of the plunger bore, this will need to be removed. 
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grahound

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Re: Poor starting
« Reply #7 on: 08 April 2020, 06:20:42 PM »
Just a correction coils do 1+42+3

Gnasher

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Re: Poor starting
« Reply #8 on: 08 April 2020, 07:10:08 PM »
Just a correction coils do 1+42+3




Lost me ????

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grahound

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Re: Poor starting
« Reply #9 on: 08 April 2020, 07:25:59 PM »
Typo , coils are cyl 1 + 4
2 + 3 not 1+3 dont want to mix up leads.

Gnasher

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Re: Poor starting
« Reply #10 on: 08 April 2020, 08:21:13 PM »
Still lost, this issue got nothing to do with coils.
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darrsi

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Re: Poor starting
« Reply #11 on: 09 April 2020, 05:24:34 AM »
Still lost, this issue got nothing to do with coils.


Because earlier in the post it was suggested to swap 1 + 3 HT Leads.


So i'm guessing if the coils feed 1 + 4 and the other 2 + 3, then the bike isn't going to be too happy about things if you swap 1+ 3 over? 
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BBROWN1664

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Re: Poor starting
« Reply #12 on: 09 April 2020, 09:22:44 AM »
IF coil #2 which feeds cylinder 2&3 is failing, you will have issues with both cylinder #2 and #3. As such, as it is only cylinder #3 that has the issue, it is not the coil that is playing up but could be the individual plug or lead to #3 or more likely a fuel/air issue with #3.
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Gnasher

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Re: Poor starting
« Reply #13 on: 09 April 2020, 10:31:14 AM »
Still lost, this issue got nothing to do with coils.


Because earlier in the post it was suggested to swap 1 + 3 HT Leads.


So i'm guessing if the coils feed 1 + 4 and the other 2 + 3, then the bike isn't going to be too happy about things if you swap 1+ 3 over?


If it was the coils the bike wouldn't run when warmed up.  It's not anything to do with the ignition circuit ;)
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darrsi

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Re: Poor starting
« Reply #14 on: 09 April 2020, 10:35:53 AM »
Still lost, this issue got nothing to do with coils.


Because earlier in the post it was suggested to swap 1 + 3 HT Leads.


So i'm guessing if the coils feed 1 + 4 and the other 2 + 3, then the bike isn't going to be too happy about things if you swap 1+ 3 over?


If it was the coils the bike wouldn't run when warmed up.  It's not anything to do with the ignition circuit ;)


I'm just pointing out the answer to your earlier confusion.
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Gnasher

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Re: Poor starting
« Reply #15 on: 09 April 2020, 10:44:17 AM »
I'm just pointing out the answer to your earlier confusion.


Yes mate.  I'm just trying to stop people sending this chap up blind allies and potentially wasting money  :rolleyes
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BBROWN1664

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Re: Poor starting
« Reply #16 on: 09 April 2020, 11:31:17 AM »
Sounds like it probably just needs a good service. When was the last time it was given some real TLC?

Change the plugs and air filter. Balance the carbs and reset the TPS.
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darrsi

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Re: Poor starting
« Reply #17 on: 09 April 2020, 05:42:21 PM »
I'm just pointing out the answer to your earlier confusion.


Yes mate.  I'm just trying to stop people sending this chap up blind allies and potentially wasting money  :rolleyes


 :thumbup
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