water in the cdi and clutch wear issues

Discussion in 'Motorized Bicycle General Discussion' started by 1alaskaman, Jun 29, 2010.

  1. 1alaskaman

    1alaskaman New Member

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    Ok,
    First let me introduce myself I stumbled on your web forums as soon as I started looking at building a motor bike. I have build my first one and managed to do it in about 3 hours. I used to be a Subaru mechanic. The 2 issues ive come across so far and the first im am only guessing at but it seems water is able to get into the CDI at the plug wire, the reason I say this is I put the bike together it ran no issues then on the same day it rained. Once it was done raining I went out to ride the bike some more and I couldnt get it to run. My thoughts were since that CDI plug wire port is facing up water got in and shorted the spark from the plug. I was thinking that once I dry it out I could silicone it and that should fix it. If you have had this and found the solution let me know.
    The next issue is the clutch the only adjustment I can find is basicly tension of the cable. Though it seems that it needed three adjustments and still wants to slip especially when popping the clutch not really while riding with motor power. I was just curioous if there was a secondary adjustment under the clutch cover.

    ~1ALASKAMAN~
     
  2. city of angels

    city of angels New Member

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    well check you conections if everything is okay check your msgneto you problably got water in there and shorten out
     
  3. 1alaskaman

    1alaskaman New Member

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    Somehow that doesnt make since seeing as the wires enter the lower portion of the motor but the CDI sits exposed and once everything has had time to dry it runs again. That is why I pointed towards the actual plug wire, Because if water gets to the base of it IE in the CDI it would allow a large amount of the Spark to hop the wire I can see it being the magneto though I could be wrong.
     
  4. Nougat

    Nougat New Member

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    The CDI is less susceptible to water than the magneto, under the left front side cover. If the bike was sitting out in the rain, or was ridden in the rain, you probably got the mag wet. You might be able to dry it out, if you're lucky. Whether you have to replace the mag or not, use some good sealant on that mag cover, and in the wiring grommet, to keep the water out next time.

    Clutch cables can like to stretch a bit, so you might need to adjust early on. There's a flower nut that holds the clutch plate on, and turning it will adjust the travel of the plate away from the ring gear - but that generally doesn't need adjusting. There might be gunk on the clutch pads (inside the ring gear), but being new, I'm not sure about that. If you do take the right side cover off to look at this stuff, put a dab of grease in between the ring gear and the small drive gear, and make sure the bolt that holds the small gear on is snug, not rattling loose. (Some people put blue loctite on that bolt.)
     
  5. city of angels

    city of angels New Member

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    well down where all the wire connects to the magneto on the case is a small rubber seal that holds the wire together is that not seal water can get to it and shorten the magneto as for the cdi i have you try replacing it its pretty much trial and error with these chinese motors once you find one problem another one pops out
     
  6. Nougat

    Nougat New Member

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    Oh, I'm just reading that you're running again with everything dried out. Good!

    The reason I'm not leaning towards CDI is that they're usually all filled with epoxy inside, you can't really get to the components. But if it makes you feel better, put some silicone around where the plug wire meets the CDI box - after you seal up the mag cover.
     
  7. CoastalCruiser

    CoastalCruiser New Member

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    Yes, pump the wire hole full of silicone/RTV. Give the clutch pads some time to wear in and always pedal away from a stop and then release the clutch.
     
  8. bairdco

    bairdco a guy who makes cool bikes

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    i change out the plug wire for a better one (7mm copper core, non-resistance) and slide a piece of heat shrink tubing over it when i install it. it's just screwed into the CDI, so you can unscrew it to take it out.

    when i'm wiring up a bike, i take out the rubber grommet at the magneto, slide another piece of heatshrink over the white cloth bundle all the way up to the mag, then put the grommet back in. makes it look cleaner, too, not having the wires showing.

    another old moto-x trick is to get a rubber boot and put it over the throttle cable and the top of the carb so water can't trickle down into your carb.

    my advice, is make sure a part is bad before you replace it. i wish i had all the CDI's and Magnetos that people keep replacing for no reason, then i could sell them back to them when they think the next one went bad.
     
  9. Goat Herder

    Goat Herder Gutter Rider

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  10. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    Just get a good wire, then right before you thread it in, smear a goodly amount of silicone grease on the first portion of the wire jacket. As it goes in it should make a nice fillet of grease to seal it. Don't use regular grease, silicone grease aka "tune up grease" for cars.

    I've rode in the rain a time or two - my magneto case is decently sealed - but odd as it sounds, the engine will run better with the grease on the plug wire vs. without. I've tried it a few times both ways.

    SBP Plug wire
     
  11. Goat Herder

    Goat Herder Gutter Rider

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    With talk of the magneto I seal mine up really well with Permatex Gasket Maker silicone. Dielectric grease at the spark plug and at the cdi. Might truly be rain proofed after that:D

    This is the best silicone I have found so far. Still Like the red stuff though. Permatex 81878 | Liquid Gasketing & Silicone Sealants
     

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