I smell burning rubber.

Discussion in 'Frame Mounted Engines' started by Alan, Feb 26, 2008.

  1. Alan

    Alan Member

    Hey all,
    During my first test run everything seemed fine except for the smell of burnt rubber. The clutch is operating properly and is in adjustment. I kept the speed to 15 or below the entire run. I did 3 miles, then another 3 miles an hour later. On both rides, I noticed the aroma of the rubber. Is this normal at first ? I hate to burn out a clutch so quickly.

  2. Check your brake pads rubbing on yer tire. When your clutch is released,does your clutch arm still have some tension? You don't want that.
  3. Alan

    Alan Member

    No tension on the clutch arm. And the brake pads aren't rubbing. I'll give it another go tomorrow. I will sniff the engine like a crazed maniac. :grin:
  4. Check too if the drive chain may be rubbing on your rear tire.
  5. hot70cc

    hot70cc Guest

    did you check the obvious? are the CDI and Magneto wires resting against the exhaust ???????. I know they are plastic but some may get confuzzzed.
  6. Alan

    Alan Member

    Yes, I checked the tire/chain/wires. All is perfect.
    I'm wondering if it was possibly my brake pads on the rear wheel. The pads are 14 years old (but like new) and with this clutch lever, I was using the rear brakes hard, while the fronts were going unused. I just ordered a dual pull brake lever for the right side, so now a single lever will pull both cables simultaneously. I also ordered another engine ( Kings 70cc)
    Thanks for the responses. :smile:
    I'll keep you posted.
    - Alan
  7. Scottm

    Scottm Guest

    Are most parts on the bike that old? Could it be the smell of burning old dried bearing grease in the axles? Just a thought. Check you left shoe and see if it's been resting against the muffler.;)
    Good luck.
  8. KiDD

    KiDD Member

    The shoe on muffler sounds like the most likely culprit for that burning smell.
  9. cooltoy

    cooltoy Member

    Funny stuff guys,with the shoe...lol. i always get that smell when I hand a plastic shopping bag off of my left handlebar on my way home from the store. Puts a hole in the bag and I lose my beer cans...lol. One time I got home with an empty bag.
  10. otis st. wright

    otis st. wright New Member

    update on burnt rubber smell?

    I know this thread is old, but I'm just breaking in my first build - an 80 cc happy time with a drum brake on the front hub and coaster brake in back - and I've been smelling burning rubber too.

    Did you ever find out what it was? Did it ever stop ?


    otis st. wright
  11. Dilly Bar Rob

    Dilly Bar Rob Member

    Both of my 80cc's smelled pretty gnarly :ack2: the first few times they heated up thoroughly. I would say the smell was present for maybe a week, after that it gradually went away.

    I figure it was just the smell of china burning off :rolleyes7:
  12. Mountainman

    Mountainman Active Member

    most any new engine

    most any new engine
    don't smell too good for a few miles
    not to worry about it much
    unless it does not get better in time
    usually will only be a short time

    once an engine -- especially air cooled is all broken in
    a little hot smell can tell us
    pushing a little too hard

  13. otis st. wright

    otis st. wright New Member

    Figured it out. In my case it was the seat rubbing on the top of the back tire.

    What a jerk!
  14. Dilly Bar Rob

    Dilly Bar Rob Member

    Lol, now that will keep your buns warm in the winter:56: