Rain makes my bike run bad

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Re: Rain makes my bike run bad

Postby tommy525 » 02 May 2012, 23:33

kjmillig wrote:So during and after yesterday's downpours my scoot was running like garbage. Hesitating and no power. I could barely get up to 59 kph. I go to my local shop and he takes it for a spin and says, "No problem. I got it up to 70". I ask him why it was running so bad in the rain and he says that lots of scooters have that problem. It's OK. When it dries out it will run fine.
I'm thinking it's time to change scooter shops.
So from someone with some actual mechanical knowledge, what's causing it and what needs to be done to fix it. I'm suspecting the hesitation is a carb issue because that happens even when it's dry with increasing frequency. But why the rain problem?
Help please.


shouldnt run badly in the rain, that sounds like bull.

my scoot ran badly only when it was under water.

but make sure to get a new air cleaner and a new spark plug and perhaps a distributor?
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Re: Rain makes my bike run bad

Postby kjmillig » 07 May 2012, 21:00

Distributor on a single cylinder engine? Does it really have one? Why would it have one?
My spark plug and boot are only 3 months old. I haven't checked the air filter yet but will do that in the next day or two. Even when it's dry outside, the hesitation is still happening at speeds above 55 while cruising even after running a bottle of cleaner through it. I'm still guessing carb needs work or replacing.
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Re: Rain makes my bike run bad

Postby tommy525 » 07 May 2012, 23:30

kjmillig wrote:Distributor on a single cylinder engine? Does it really have one? Why would it have one?
My spark plug and boot are only 3 months old. I haven't checked the air filter yet but will do that in the next day or two. Even when it's dry outside, the hesitation is still happening at speeds above 55 while cruising even after running a bottle of cleaner through it. I'm still guessing carb needs work or replacing.



Thats what i thought too, but its called "bai ching" and it works like a distributor. IF your scoot is backfiring especially.

anyway it shouldnt run rough because of rain.

get a better mechanic

distributor because even tho single cylinder it acts as spark timing, which is still needed. unless you have electronic ignition.
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Re: Rain makes my bike run bad

Postby Skater bum » 08 May 2012, 01:42

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Re: Rain makes my bike run bad

Postby kjmillig » 18 May 2012, 08:28

With the rain these last few days it's getting worse. I'm taking it to a new mechanic this afternoon. The second half of my 16 km commute this morning in the rain had me down to 40 kph. :fume: :fume:
Thanks for all the information!
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Re: Rain makes my bike run bad

Postby kjmillig » 19 May 2012, 10:53

Yep. Went to a different mechanic and suggested that maybe it's the air filter. He asked if I had been though any particularly large amount of water, what it was doing, etc, took it for a short test drive, and agreed that the air filter was the first guess but he'd check out other stuff as well if needed. Then opened up the air filter and it was trash. Replaced it for $180 and the scooter runs like a champ. :bravo:
NOT going back to the first guy.....ever. I've been going there for 2 years but I will not return. :fume:
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Re: Rain makes my bike run bad

Postby tommy525 » 19 May 2012, 12:32

told ya to check the air cleaner (filter element).

glad u got it sorted. A good mechanic is worth A LOT
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Re: Rain makes my bike run bad

Postby sulavaca » 23 May 2012, 21:37

If you haven't had your HT lead replaced for a while, then do so anyway. The HT lead will break down over time and cause current leaks as suggested. It's so cheap to replace, along with the spark plug, and you can improve your performance and fuel economy at the same time by doing away with the old one.
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Re: Rain makes my bike run bad

Postby ktk_ace » 27 May 2012, 21:57

tommy525 wrote:told ya to check the air cleaner (filter element).

glad u got it sorted. A good mechanic is worth A LOT


A good mechanic is GODLIKE if he does 10Km roadside rescues from his shop :)

and as suggested, AF, sparkplug, sparkplug "mushroom head" , most common 3 problems.
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Re: Rain makes my bike run bad

Postby johnledoe » 04 Jul 2012, 14:35

Glad to hear changed the air filter worked for you.

I had almost the same problem, when it was raining heavily or had just rained heavily, I had problems with my scooter running. It would often just turn off when I was waiting at a red light or just accelerating from a red light. If I did manage to get my scooter going from a red light, there was no power loss.
It was just scary having your engine die when the light turns green, as I'm sure a lot of you can understand. Especially if you aren't on the far right of the lane.

I was told by my friend at the Kymco warranty shop in Hsinchu (or is it Hsin-Ju) that the "Ignition Coil" is often the problem in my case, even on new scooters.

I went to my scooter parts distributor in Zhubei and ordered a new ignition coil with a new spark plug lead for about 680NT and put it in myself. It's a real easy job, just take out the seat and compartment, take off the 2 nuts holding down the ignition coil and disconnect the 2 wires that connect it and the spark plug lead.

After changing my ignition coil, never had problems with the rain since.

However, with your scooter, I can easily see that the air filter that would have been the problem. Often when scooters don't have much power and have problems getting upto 60+km/h, check your air filter and the air box if it's properly sealed.
Found this out the hard way after I took apart my carb to clean it and my air box. When I put it mostly all back together, with a new air filter, I didn't put the cover to my air box back on and tested my scooter and couldn't figure out why the engines RPMs had troubles going higher or being steady over 3000. Ended up taking apart my carb again to
see if I messed something up. Everything looked fine, so I put the carb back on and this time put the air box cover back on, and that fixed my engine RPM troubles.

I guess lastly I'll finish up with what tommy525 called a "distributor". In my shop book for my scooter, it's called a "CDI unit". It controls the firing of the spark plug, which gets it's timing from the alternator/generator. Most scooters have them, even if they aren't fuel injected. My isn't fuel injected and it has one.
I know when I saw the word distributor, I saw a picture in my mind of what they used a long time ago in cars and motorcycles. A round thing with your spark plug lead(s) coming from it and inside a bar that would spin around to make contact with the lead(s) to deliver the spark. Can't remember when they stopped using those, as I only got into
engines in the past five years or so.
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