For the past two years (almost) I've been having a love & hate relationship with my TB 350 (new). I love the bike for its power and handling ability. However, I have just one issue with the bike and that is whenever it rain the bike will misfire and stop. I have gone through all the reviews of fellow RE owners but found out that non of their problems are similar to mine.
1. The problem started on January 2013 when I went for a short 80 kms ride while it was raining. The bike suddenly refuse to go forward, however, the engine did not died off, but remain in idle, the moment I accelerate in 1st gear it stops and engine also died. I was 40 kms away from home in the highway. I tried starting the bike but it choke, I tried opening the lid of the tank but this also did not ease my problem. My last option was I have to travel with the "choke on" to reach home. The next day, I went to ASC, they open the tank, clean the fuel filter and everything work fine again. (1st experience)
2. (2nd experience- The problem arises again after a few months that is when the rain starts coming. I took the bike again to the ASC, the mech guy open the spark plugs and air filter - but the problem is still persisting. I told him to spray water on the bike and especially on the area where the spark plugs are located while the engine is running, the moment the water contacted the area, the bike began to miss. The mech guy told me this is normal as "slight misses" will always be there. I am not buying this kind of stuff. What the mech guy was saying indirectly to me is "when the rain comes, stay home and polish your bike"!!!
3. Friends and countrymen, riders of the TBird, please HELP!!! I want this problem to be solved once and for all.

Thanking you all.

Hello mate,

I read your post about monsoon misfiring and your experience with dealing with the service center guys.

I had faced a similar problem with my Yamaha R15 Version 2, and had posted the exact same problem on the Yamaha R15 Version 2 thread.

I ended up spending around ₹ 3K on "fuel pump service", "fuel tank cleaning" and "injector cleaning" on words of the service center guys this monsoon with ABSOLUTELY NO LUCK IN GETTING MY PROBLEM SOLVED.

They blamed water entering fuel tank as the culprit.

In my last service, however, the mechanic at my service center replaced the "SPARK PLUG CAP".

The problem seems to have solved now. The part costed a mere ₹173 for my bike.
Worth a try, considering my almost ruined monsoon riding experience has become a joy again.

Hope this helps.

Thanks Rishi for sharing your experience, at the ASC they have already changed the spark plugs and plug CAP as well, even the distributor wire (cable) but still of no help

Open up the carb and have it inspected and cleaned. maybe the diaphragm needs to be replaced. Are you sure the airfilter is ok ? If not, just ride without the air filter for a couple of kms and observe.
Otherwise it could be the electricals.. cdi / regulator rectifier..try swapping from a normal running bike.

1. Tomorrow I will try riding without the air filter and observe. 2. Carburetor is working fine. 3. Problem of the bike missing is whenever water touches the place where the spark plugs are, then immediately the bike misses. 4. To avoid this, for a couple of months now I have been riding by covering the area where the plugs are with a cloth. This to some extent has help me a lot . But if I forget to cover the area than the circus starts again.

My TB350 is a month old and I have almost the same problem. Its not a problem when the bike runs but when I park it somewhere and it rains then the bike take ages to start. And when it starts it dies in a few secs again. At first I thought its coz the bike is new and engine needs sometime but it kept happening. I asked a few people who own the TB and they said they never had this problem. I just stopped parking in open places now.

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1. Tomorrow I will try riding without the air filter and observe. 2. Carburetor is working fine. 3. Problem of the bike missing is whenever water touches the place where the spark plugs are, then immediately the bike misses. 4. To avoid this, for a couple of months now I have been riding by covering the area where the plugs are with a cloth. This to some extent has help me a lot . But if I forget to cover the area than the circus starts again.

Get the wiring/ground and all connections and fuses checked, unplug and replug every possible connection in the wiring. If possible use a electronic contact cleaner available in spray cans.
If possible use a heat shrink wrap around the molex connectors (the white/colored connectors).. or wrap them with some plastic cling wrap and observe. Also could be the ignition switch/socket itself that might need replacement. Also try to use an after market plug cap instead of the oem one.
Do check these.

Thanks for the tips. [ATTACH=CONFIG]155363[/ATTACH] this is how I manage during the rainy seasons. I hope you guys will understand my problem. All tips and advice accepted.

Is the problem on both the plugs ?
i suspect the connection between the wire and the spark plug cap or a faulty plug. try using an aftermarket plug cap from a local spares shop (even better if you can get one that has a rubber boot at the end and ensure the wire is not frayed and push it all the way thru.)
last wild guess..could water be possibly making its way in to the cylinder thru the plug hole ?

s1d, thanks for shedding some light. I never thought all these days that water may have found its way to the cylinder head thru the plug hole. I have to seriously check on this. On Monday I will go for the aftermarket plugs.

Cud sombdy pls help me abt the current waiting period of tb350 here in kolkata... Booked my tbird on 8th august 2014 n was assured of deliver within 25-30 days max.... Called up on 3rd sept n they said it will be by 7th... Nw they say call after 10th... Their new lot arrives on 10 th "May be"
.... Booked here frm Austin distributors in kolkata...!!!!

pls get an aftermarket plug cap too, and make sure the plug is compatible with oem.. or just buy oem rated/brand plug from an aftermarket spares shop.
water might also get it due to failed head/ rocker cover gaskets.. pls have them replaced if the new plug and plug cap doesnt fix it. RE's are more prone to gasket failures.
btw, i asked if the problem is on both sides or just on the left hand side plug ?