Starting problems when warm

lau · Two Stroke Sniffer Joined: 01 Sep 2009 Karma :

Hey, I've not long had a CBR600f (2002) but having problems finding what the problem is with it. When its warm it struggles to start, can bump start it no probs but if I do a few short journeys it wont fire up again, its almost like the battery is flat (its a new battery).

I went through and cleaned all wire connections and replaced starter relay as it was pretty corroded anyway but didn’t make any difference, could it be the starter motor needs replacing? Its only done 18k.

Cheers

Lau

Freaky_1 · Nova Slayer Joined: 12 May 2010 Karma :

First three things I check.

1) Ground (actually positive too, but usually ends up being the ground) connection at batt AND chassis.

2) Timing

3) Starter solenoid

Those are the first three things I check, because most of the bikes people ask me to check out (after having them this way for a long time and not finding the issue) end up being one of those three in that order.

For #1, you want to insure it's not only tightly connected at both ends, but that there's no corrosion on it's connections or terminals as well. (Sometimes the cable it's self will be corroded and be the issue, but most often, the connections)

This may be of no help in the least, but it will give you a good place to begin your search and perhaps end it as well.

Best of luck,
Frank

lau · Two Stroke Sniffer Joined: 01 Sep 2009 Karma :

Thanks very much for the advice, really appreciated.

Lau

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

I assume you mean the starter isnt turning the engine over or very slowly when the motor is hot?
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lau · Two Stroke Sniffer Joined: 01 Sep 2009 Karma :

Yeah thats right, after stopping and starting 2 or 3 times it really struggles and after that it wont turn over at all untill its cooled down.

Cheers
Lau

Freaky_1 · Nova Slayer Joined: 12 May 2010 Karma :

Vincent · Banned Joined: 16 Oct 2006 Karma :

It's not overheating is it? If it is, the engine will get "tight" and the starter wil struggle to turn it over.

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

Billing · World Chat Champion Joined: 12 Mar 2009 Karma :

If you're doing a few short journeys maybe the battery is discharging from turning the engine over and can't get enough charge back in because you're only doing short journeys?

Go for a really long hoon about, see if that fixes it when you get home
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lau · Two Stroke Sniffer Joined: 01 Sep 2009 Karma :

Great thanks, i'll try the jump cable to check that first.

Vincent - no i dont think it is, seems to be staying pretty level.

BillingTZR - that was my original thought but unfortuantly not, rode 80 odd miles the other day, stopped for fuel and wouldnt start up.

Cheers for all your advice on this.

Laura

lau · Two Stroke Sniffer Joined: 01 Sep 2009 Karma :

Sorry forgot to say yeah i did try that actually and it dropped below 9 after a few short rides, the dash resets 90% of the time also when starting it up.

lau · Two Stroke Sniffer Joined: 01 Sep 2009 Karma :

That i'll need to check, I'll give it a go this eve and find out.

Thanks
Lau

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

My old CBR6 did this when the rec/reg was knackered and not charging the battery. When it was cold, the battery had sat for a while and regained some charge (a battery will do this to an extent, chemistry at work) and the bike would start and run for a while. Once I stopped and tried to restart it, there was no juice left in the battery to get going until it had stood for a while. This culminated with me being recovered home one balmy spring evening when the battery was totally dead. Mine being a model with always-on headlights didn't help here. Modern junk.

Reg/recs on that bike are exceedingly dodgy. Do the normal test - with the engine running, put a multimeter across the battery terminals and expect to see around 12.5v. Hold the revs at 5000rpm ish and expect to see around 14.5v. If it's showing more like 60v or less than 13v then there is a fair chance that your reg/rec is blown. I got a replacement for about £20 delivered from Hong Kong on ebay.

lau · Two Stroke Sniffer Joined: 01 Sep 2009 Karma :

Tested it out last night, drops to around 6 when starting when warm, from cold its at 13.2.

Batteries charging though, all good there. Checked ground with jump cable and batt connection - all fine.

Seems to struggle when its only physically hot.

Picked up a starter motor so will attempt to fit that at the weekend and hope for the best!

Cheers for all your advice, very much appreciated.

Lau

lau · Two Stroke Sniffer Joined: 01 Sep 2009 Karma :

Hello...again

So spent a fair while replacing connections and cleaning everything up, replaced the starter motor also but the problems still there....

Has anyone got any more ideas what it could be?

Thanks

Lau

DrDonnyBrago · World Chat Champion Joined: 03 Jan 2010 Karma :

The reg/rec suggestion is worth trying for £20 from HK - our bikes have notoriously sh1te R/Rs.

lau · Two Stroke Sniffer Joined: 01 Sep 2009 Karma :

Thanks i'll take a look into it, just spoken to someone about it and they suggested it could be a problem with the crankshaft sensor?

Anyone had any problems with that before?

Cheers

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

Don't warn starter mtor brushes get worse with heat?
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lau · Two Stroke Sniffer Joined: 01 Sep 2009 Karma :

Yeah they do but i've replaced the starter.

Lau

gmanxiii · World Chat Champion Joined: 20 Nov 2006 Karma :

lau · Two Stroke Sniffer Joined: 01 Sep 2009 Karma :

Hey thanks for the replay, do it not reset when it drops below a certain voltage so it cant power up rather that disconnecting completely?

The thing is the battery is brand new, charging perfectly so i'm not sure that would be the issue?

Last time it struggled to start i tested the battery - fully charged.

Thanks
Lau

gmanxiii · World Chat Champion Joined: 20 Nov 2006 Karma :

Hi sorry, thats what I meant, as when the battery has discharged all its power its pretty much the same as disconnecting the battery, so the clocks would reset. If the voltage is dropping so low on the battery after & during use but is fine when its cold and unused it doesnt really seems to be charging properly. Have you done the test that Robby wrote? as you mention its 6v which sounds wrong. If you are holding the revs at 5000rpm 13.2 is kinda borderline/minimum too, this may drop slightly if you have all your head/brake/indicatorslights on. Revving should be charging the battery up and show around 14v plus regardless though.
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lau · Two Stroke Sniffer Joined: 01 Sep 2009 Karma :

Hey thanks for reply, ive just tested it - held revs at 5000rpm and it was at 14.5.

Running out of things it could be now! Crying or Very sad

Cheers,

Lau