T500 runs on one cylinder once it hits 3500rpm

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PippiFyrecracker
Around the block
Posts: 66
Joined: Mon Apr 06, 2015 6:17 pm
Country: Canada
Suzuki 2-Strokes: 1975 T500, 1983 SP250
Location: ottawa, ontario, canada

T500 runs on one cylinder once it hits 3500rpm

Post by PippiFyrecracker »

Carbs are cleaned and good... maybe ignition coils? Spark seems weak [quote][/quote]
Zunspec4
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Joined: Tue Dec 16, 2008 11:37 am
Country: UK
Suzuki 2-Strokes: T500R, SV1000S, TS125, Seeley T500
Location: Trowbridge UK

Re: T500 runs on one cylinder once it hits 3500rpm

Post by Zunspec4 »

Hello Pippi,

It is possible that as the revs rise you are running out of power from the battery. Higher revs take more out of the electrical system. As a simple test charge up the battery using a battery charger, a good battery should read 13.0 - 13.4v across the terminals with no load. Then give it a whirl up the street and see if it makes a difference. If the test shows a better performance you will need to look at the charging circuits and determine if they are doing the job they are supposed to.

Cheers Geoff
Craig380
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Joined: Mon Dec 01, 2008 2:52 am
Location: Manchester, UK

Re: T500 runs on one cylinder once it hits 3500rpm

Post by Craig380 »

+1 on it being a dying battery. A good, fresh, fully charged battery would enable you to run for 90 minutes to 2 hours without any problems at all (lights switched off), even if you disconnected the charging system.

I ran my 380 on total-loss electrics for a few years because the generator rotor had died, it would happily do 70 - 80 miles before the spark started to get weak. And of course the 380 has three ignition coils to fire, not the two of the T500, so it's taking 50% more juice from the battery.

If the battery on the bike is more than 3 or 4 years old, just replace it, the lead-acid batteries these bikes use are dirt cheap.
1976 GT380 - wounded by me, and sold on
2006 SV650S - killed by a patch of diesel and a kerb in Feb 2019
2017 SV650 AL7 - naked and unashamed
User avatar
PippiFyrecracker
Around the block
Posts: 66
Joined: Mon Apr 06, 2015 6:17 pm
Country: Canada
Suzuki 2-Strokes: 1975 T500, 1983 SP250
Location: ottawa, ontario, canada

Re: T500 runs on one cylinder once it hits 3500rpm

Post by PippiFyrecracker »

ordered the power dynamo electronic ignition, ripped out all the wiring, doing a rebuild....
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