Misfire in rain

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nigb
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Joined: Thu Nov 12, 2009 12:17 pm
Location: Australia

Misfire in rain

Post by nigb » Sun Jun 11, 2017 7:52 am

Hi I have had my KR over 10 years now & have done numerous long trips on it. However ever since I have had it if it rains it misfires like crazy especially under load & quite often just cutting out all together. Spraying WD40 in abundance helps for a short time & then it starts missing again. I recently replaced the copper HT leads, NGK spark plugs & caps & still have a problem. Anyone else experienced this with their KR?
2008 Ducati 1098
2003 Triumph Sprint
2003 KTM 450EXC
1975 h***a 400-4 (fully restored)
1984 KR 250

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Binetta Steve
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Re: Misfire in rain

Post by Binetta Steve » Sun Jun 11, 2017 8:45 pm

I know this sounds wacky, but have you tried removing the fairing , then in a garage or car port ( so its a bit darker) get a hand bottle sprayer and spray an aerosol of water from the coils down. If anything is arcing to earth you will see the blue flashes.

Given you have a fairing on and the engine is pretty hot then this cold dousing should show up shorting fairly quickly.

If dousing it with WD works then the silicone is finding the break.

Its strange , I would have thought changing the leads and plug caps would have had a positive result. Its not something silly like the kill switch or side switch earthing is it?

nigb
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Posts: 23
Joined: Thu Nov 12, 2009 12:17 pm
Location: Australia

Re: Misfire in rain

Post by nigb » Mon Jun 12, 2017 12:45 am

Doesnt sound wacky to me Steve sounds like a good idea. I am away from bike for 10 days (its at another house) so I will give that a go then. Yes I thought the plugs, leads & caps would have sorted it. One thing I have noticed is that it starts a lot easier than it used to do. Thanks for the reply I will let you know how I go.
2008 Ducati 1098
2003 Triumph Sprint
2003 KTM 450EXC
1975 h***a 400-4 (fully restored)
1984 KR 250

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StrokerBoy
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Re: Misfire in rain

Post by StrokerBoy » Mon Jun 12, 2017 9:27 am

Never had that problem with mine, but then it hardly ever rains here... :lol:

Plug caps and leads would have been my first attempt at a fix too. Both CDI units are pretty exposed, check the connections. Might be worth making some sort of temporary shield from cardboard next time you ride in the rain, see if you can prevent the water getting to wherever it's causing a short.
Kawasaki KR250 Tandem Twin (x4) & KS-II 80,
Yamaha RD350LC,
Suzuki GSX-R750RK & RB50 Gag.

nigb
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Posts: 23
Joined: Thu Nov 12, 2009 12:17 pm
Location: Australia

Re: Misfire in rain

Post by nigb » Mon Jun 12, 2017 1:24 pm

LOL Tim its because it hardly rains here it hasn't been much of an issue but the last few rides have been wet & it has been a nightmare trying to get the bike home. Yes the cdi boxes are exposed but the fairings do prevent them them getting wet for a while. If I am driving down a dry road & it starts raining the misfiring happens very quickly & also continues whilst the road is wet after the rain (roads dry out very quick in Oz). I have tried putting duct tape between the bottom of the radiator & the belly fairing thinking the water was spraying through there to no avail.
Curiously my h***a 400-4 does it also but they were renowned for it. WD40 normally clears that for a while.
2008 Ducati 1098
2003 Triumph Sprint
2003 KTM 450EXC
1975 h***a 400-4 (fully restored)
1984 KR 250

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