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Post by chris900divvy on Nov 5, 2015 15:05:00 GMT
Hi just wondering if anyone else has come up with a solution for this with the 900? It seems to me that the position of the coils on the 900 leads to water accumulating at the ends of the HT leads where they meet with the coil leading to a poor spark and misfiring in the wet. The way they are positioned alongside the frame rails means water just runs down the side of them. I've rerouted the leads (seems the left side coil is the cause of the problem) and have put silicone over the ends of the HT leads where they meet the coil. Seems to have improved things a bit but its not perfect, seems to me that left outside moisture just seems to get into the ignition system causing issues. Would love to know of a good long term solution! When the bike struggles to start I spary the coils with GT85 and it usually jumps into life soon after...I initially thought the problem was with the plug caps themselves but having put little rubber covers over the exposed two on the ends of the cylinder seems its nothing to do with that.
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Post by GAv on Nov 5, 2015 15:51:45 GMT
Regular spraying with WD 40 might help.
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Post by chris900divvy on Nov 5, 2015 15:54:30 GMT
Cheers that's what I end up doing every time it struggles to start anyway! Just thinking of a more permanent solution to it. I think its the location of the coils on the Divvy that gives rise to it, my ZRX never suffers in the wet - its coils are hidden close under the tank completely out of the way.
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Post by teejayexc on Nov 5, 2015 17:10:26 GMT
In answer to your question, nope never had any problems with wet weather running on a D9, ( and before some tunc reckons it's always garaged, belive me it's been out in some horrendous rainstorms ).  I suspect the problem lies with the ht leads themselves, probably hairline cracks in 'em. If they are the originals definitely change 'em, cheap enough to change 'em even if they have been replaced before. |
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Post by m40man on Nov 5, 2015 17:31:43 GMT
In answer to your question, nope never had any problems with wet weather running on a D9... Me neither - had 3, always been fine in the wet. Current (my 2nd one, which is now also my 4th) is parked outside, starts & runs fine. |
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Post by GAv on Nov 5, 2015 19:54:45 GMT
I only had one and only for a few months, but it always started first turn of the key, I also wondered about the leads as Teajayexc says,they can break down, (often becoming hard and brittle in the process)
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Post by mlbv on Nov 5, 2015 20:13:53 GMT
I jet washed mine quite vigorously the other day while it was running, it eventually started spluttering and died.... when I had finished I was expecting to have a bit of a ball ache starting it back up again, but it fired straight away, so all of that water probably starved it of air more than it affected the electrics.... !!
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Post by HRHpenfold on Nov 5, 2015 20:16:59 GMT
I thought the D9 used coils with the HT wire bound in, so no join for the water to get in,
Just buy a new pair of coils, they are cheap enough,
Actually I may have a new pair of aftermarket coils somewhere!
Monday would be the earliest to look though!
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Post by bluevinny on Nov 5, 2015 23:31:17 GMT
Measurement of the high and low tension resistances of the coils should confirm whether the coil and HT system needs replacing.
Left the bike parked in the driving rain today and it started fine despite the deluge.
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Post by chris900divvy on Nov 5, 2015 23:47:55 GMT
Hmm sounds like maybe changing the HT leads would help though both they and the pattern coils haven't done that many miles, have got some handy so will have a go. I've always found the bike a bit temperamental with wet weather in the six years I've had it, sealing the ends of the leads with silicone where they meet the coils seems to help though maybe I've just overlooked the significance of the HT leads maybe they aren't keeping the elements out.
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Post by crickleymal on Nov 6, 2015 11:12:24 GMT
Whilst spraying with WD 40 may help in the short term it will probably end up attracting dirt and thus causing moisture to linger in the long term. Cleanliness is the friend of HT.
You could try getting some HT lacquer, thoroughly cleaning the leads and spraying with lacquer. That should keep the water out.
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Post by chris900divvy on Nov 7, 2015 17:49:57 GMT
I took one of the coils off today and had a look, it looks to me as if the stuff they use to seal the back of the coil (looks like a sort of glue) was cracked and had been affected by the heat as it was covered in little creases. Maybe this is letting moisture in through the back of the coil? Didn't look normal to me, they're pattern coils. I don't have much faith in them as they were from the same place I got my ZRX coils, and those gave trouble after less than a year's riding. False economy I suppose though I suppose its hit or miss with a secondhand OEM set.
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Post by chris900divvy on Nov 14, 2015 20:18:39 GMT
Well I fitted a secondhand set of OEM coils today to the bike, taking off the old coils they looked like this:   Those don't look quite right to me! I don't know why but the sealed ends seem to have melted through somehow, seems to me this must be the source of the wet weather running problem as it would be letting in damp and letting it arc all over the place presumably. I think these cheap pattern coils really aren't too clever as these can't have covered much more than 10k. I rode 70 miles today with the 45k used set of original Yamaha coils and it didn't miss a beat despite the heavy constant rain, started first time too after being left. Problem solved for good I hope! Both sets of coils tested perfectly normal on the multimeter. |
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Post by crickleymal on Nov 15, 2015 21:41:35 GMT
Multimeters only have a 9 volt battery in them so when you measure resistance there's not much voltage applied. To test out coils what you need is a megger which will put at least 500 to 2000 volts on the circuit. Then you measure from the circuit to ground or to the other winding on the coil.
What's happening is that at low voltage it's ok but at high voltage something is breaking down and conducting.
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Post by teejayexc on Nov 15, 2015 22:15:58 GMT
Multimeters only have a 9 volt battery in them so when you measure resistance there's not much voltage applied. To test out coils what you need is a megger which will put at least 500 to 2000 volts on the circuit. Then you measure from the circuit to ground or to the other winding on the coil. What's happening is that at low voltage it's ok but at high voltage something is breaking down and conducting. 'Kin ell, I've just looked at prices for a megger tester......you could buy a D9 for that sort of money  |
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Post by chris900divvy on Nov 15, 2015 23:29:56 GMT
Multimeters only have a 9 volt battery in them so when you measure resistance there's not much voltage applied. To test out coils what you need is a megger which will put at least 500 to 2000 volts on the circuit. Then you measure from the circuit to ground or to the other winding on the coil. What's happening is that at low voltage it's ok but at high voltage something is breaking down and conducting. Well I was just following the Haynes manual really which suggests using a multimeter, it seems pretty clear to me what the problem was by looking at the rear of the coils though. Problem has been solved with the new set anyway so am happy I can move on now without needing to invest in more equipment. I think the lesson I've learnt though is not to bother with cheap pattern coils as they're a false economy. |
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