Wet weather issues. - .: XT660.com

jon660z · # 1 28-07-15, 13:25

Hi guys, on my recent trip to Scotland we got caught up in some.really heavy rain, and my bike (2009 non abs tenere 31000 miles) started to run rough and missfire something rotten. Its used all year round for an average of 250 miles A week.

The misfire happens only when ive been on a steady throttle for around 30 seconds. And its usually between 3-4000 rpm. And only when wet. After yesterdays rain it started again it runs very well when dry.

Bike is fitted with both kev mods dna filter snorkel removed and open leo vince exhaust. Its been set up this way for 2 years and no problems with rain or river crossings.

My first thought was coil/ht lead joint So i blasted with WD at the roadside. Seemed to do the trick for maybe 10mins. But it got me wandering as too why it only happens on a.steady throttle. Ive whipped off the TP SENSOR and have checked the resistance as stated in the haynes book of lies, It climbs very linear. But reaches a maximum of 2.48 k ohms.when the book says it should 0-6 kohms mine is only 0-2.48

The max resistance in hanynes says 4-6
Mine is only 2.48
Could this be the cause? Are the values in haynes correct?

If i hold at say 65 on motorway if feels gutless and revs drop and it starts to miss, give it a handful and its off like a scalded cat.

All connectors and clean and dry inc reg/rec and tps. Coil is off to be waterproofed.

Any help and suggestions would be most.appreciated.

Max resistance when measured accross blue and black blue wire.

Thanks Jon

keithy2 · # 2 28-07-15, 13:36

If you have the kev mods fitted I am pretty sure your resistance readings will be way out. I would have a word with kev.

jon660z · # 3 28-07-15, 14:56

I may have slipped up here, on re reading the haynes book of lies i didnt follow.thebinstructions and actually removed the tps to check the resistance, i shall re do it on the bike.

Pleiades · # 4 28-07-15, 18:58

Definitely see if the coil is at fault first.

HT leakage is quite common on all the XTs in damp weather. It is usually the joint between the lead and the coil that causes problems. Once dried out seal that area with silicone grease. Try and avoid silicone/gasket compounds that set into a rubbery substance as they invariable crack/come adrift at the edges over time with the continual heating up/cooling down and actually make the situation worse by trapping moisture or sucking it in through capillary action.

Failing that, it could be the TPS breaking down. The track inside can/does wear away eventually, giving erratic resistance reading and weird misfire at certain rpm.

Here's an example of a very similar sounding problem to yours...

http://www.xt660.com/showthread.php?t=23102

Started off as a suspect coil because it only appeared to happen in damp weather, but ended up being the TPS.

Quote:

Originally Posted by keithy2

If you have the kev mods fitted I am pretty sure your resistance readings will be way out. I would have a word with kev.

Neither of Kev's mods affect the resistance measured at the TPS.

jon660z · # 5 28-07-15, 22:17

Well i removed the coil and stripped everything down, clipped the ends of the ht lead back, cleaned regreased everything. Rode home in the rain and theres no change. Still rough,
I had read the thread pleiades suggested before hand. Which made me suspect the tps.

I have seen 2 on ebay. One is the part number that tom listed in the thread, which looks a little different to mine but looks like it will fit.

The other is listed for an xj1300 and looks identical too mine.

Im unsure which to get.

Cheers
Jon

Pleiades · # 6 28-07-15, 22:25

The actual part number for bike is: 3P6-85885-00

jon660z · # 7 29-07-15, 10:09

Quote:

Originally Posted by Pleiades

The actual part number for bike is: 3P6-85885-00

I found that too. But the website listing it is selling it at a whopping �137
Not really an option unless i am 120% certsin that is causing the problem.

The one fitted to the Ten doesnt have any identifying marks on it. Not even mikuni in the casing like the one pictured.

In tripletoms listing he lists a different part number Yamaha part # 5PS-85885-01
This looks the same shape but is open on the rear where mine is sealed and he has a Tenere I think.

Ill post pics.

bikemad195 · # 8 29-07-15, 20:26

Quote:

Originally Posted by jon660z

Hi guys, on my recent trip to Scotland we got caught up in some.really heavy rain, and my bike (2009 non abs tenere 31000 miles) started to run rough and missfire something rotten. Its used all year round for an average of 250 miles A week.

The misfire happens only when ive been on a steady throttle for around 30 seconds. And its usually between 3-4000 rpm. And only when wet. After yesterdays rain it started again it runs very well when dry.

Bike is fitted with both kev mods dna filter snorkel removed and open leo vince exhaust. Its been set up this way for 2 years and no problems with rain or river crossings.

My first thought was coil/ht lead joint So i blasted with WD at the roadside. Seemed to do the trick for maybe 10mins. But it got me wandering as too why it only happens on a.steady throttle. Ive whipped off the TP SENSOR and have checked the resistance as stated in the haynes book of lies, It climbs very linear. But reaches a maximum of 2.48 k ohms.when the book says it should 0-6 kohms mine is only 0-2.48

The max resistance in hanynes says 4-6
Mine is only 2.48
Could this be the cause? Are the values in haynes correct?

If i hold at say 65 on motorway if feels gutless and revs drop and it starts to miss, give it a handful and its off like a scalded cat.

All connectors and clean and dry inc reg/rec and tps. Coil is off to be waterproofed.

Any help and suggestions would be most.appreciated.

Max resistance when measured accross blue and black blue wire.

Thanks Jon

I've had 2 wet misfires I thought the first was the coil ...... it wasn't ot was the ht lead joint and the 2nd was whenever it got wet or I washed it it would miss and buck at 3000 rpm I even posted the video on youtube under my name of Marvy finger bottom ....... turned out it was the map sensor under the edge of the tank if I put my finger over or crimp the pipe it stopped the miss firing

tripletom · # 9 30-07-15, 22:58

Jon, sorry, been away getting married.
My problem came back.
Now I had replaced the TPS and the OE TPS was out of spec. I checked the replacement TPS and it was in spec.
MAP sensor under the tank was in spec.
IAT sensor was in spec.
I replaced the O2 (lambda sensor) and problem remained.
In the end I removed the O2 sensor, fitted a bung and a loop for the plug and the bike has been running fine since.

Electrex do a coil that is in size spec, but the primary resistance is different (lower) than the listed Haynes value.

jon660z · # 10 01-08-15, 19:51

Cheers for the reply Tom :-) congratulations on getting married.

I managed to pick up a used coil from a 04 660x �20. Soon as it landed i did the resistance test and it was bang in spec so i waterproofed it and stuck it. On. Bikes been fine doing the jetwash test. (piss everything through and go ride)

The suspect coil has been off a few days now in the house and is still giving erratic readings on the secondary winding. So i think i may have sorted it.
Im out laning tomorrow ill let you know how i get on.

Many thanks for everyones help it has been invaluable.

Ride safe
Jon

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