Speed Triple -03 slow cranking, bike won't start - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 8 (permalink) Old 05-26-2013, 10:25 AM Thread Starter
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Speed Triple -03 slow cranking, bike won't start

Hi,
this is my first post on this forum (apart from the one in welcome center), I have been lurking around for a couple of years though.

My friend has a 2003 Speed Triple which will not start on starter. On a running start however the bike fires up quick and nice. The problem started last summer, so he has had a lot of exercise while running with his bike.

The bike cranks rather slow and won't start. We have installed a new starter motor and tried with three different batteries. Even on jumper cables we can't get the bike to start on the starter motor.

We have followed DEcosse's excellent electrical troubleshooting thread and have done the following measurements.

Battery voltage ignition off: 12.0 V (yes, this is weak)
Battery voltage ignition on: 11.35 V
Battery voltage engine on idle: 12.5 V, drops to 11.3 when revving.

Resistance check on R/R three pin plug to 4-pin plug: About 500 Ohms when we get a reading.

Resistance check on stator: 1 Ohm on each.

Quick check for stator problem: Open circuit

AC voltage output from the stator: All combinations 20 V - 70 V (idle to 5000 rpm)

We have not yet pulled the stator cover.

In all the threads I have read I haven't as of yet come across an identical problem, of course I can have just missed it.

I would need some help in interpreting the measurements and any ideas and experiences about this problem are more than welcome.

Thanks in advance
/Michael
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post #2 of 8 (permalink) Old 05-26-2013, 10:50 AM
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You definitely have generating system problem.
If you are confident of the stator tests - and your reported data suggests is good - and the stator connector is not burned and fuse #2 is good then most likely R/R is bad.
Battery will be draining when riding and that will subsequently make it slow to crank & hard to start.


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post #3 of 8 (permalink) Old 05-26-2013, 11:01 AM Thread Starter
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Thanks for your quick reply DEcosse!
When you say stator connector, do you mean the three pin connector connecting the stator to the R/R? If so, then I have not seen any signs of being burnt.

I will have another look at the fuses just for the sake of it, shame on me if I should have missed such a simple thing.
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post #4 of 8 (permalink) Old 05-26-2013, 11:09 AM
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There are two connectors in line from stator - one at R/R which you recognize but another closer to stator - the latter is the one that burns.
Follow cable up from stator cover & should find it tucked up behind top left rear engine mount or in general area of top rear left of cam cover
Fuse 2 - 30A is the one to check
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post #5 of 8 (permalink) Old 05-26-2013, 02:13 PM Thread Starter
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I have checked the points you mentioned, 30A fuse and all other fuses are OK and there are no signs of burning on the lower stator connector.

Would you suggest we replace the R/R based on this?
Should we in that case go for a full swap to a MOSFET R/R or take our chances on a standard R/R?
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post #6 of 8 (permalink) Old 05-26-2013, 02:24 PM
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Yes, swap the R/R, put in a MOSFET.
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post #7 of 8 (permalink) Old 05-26-2013, 02:36 PM Thread Starter
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Thanks a lot for your highly valued help, DEcosse!
We'll do the swap.
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post #8 of 8 (permalink) Old 05-26-2013, 02:45 PM
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You may end up having to replace the battery - when it has been constantly discharged to low level, it could possibly be sulphated.
You'll just have to see if holds a strong charge once you resolve the primary issue.
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