Mitsu TLE43 - Any ideas?

Discussion in '2-Stroke Engines' started by Warner, Oct 6, 2008.

  1. Warner

    Warner Member

    Okay guys....I know I should probably look at a few things, but I'm coming here to find out where you would start. On my way home from work Friday, my engine stalled once when taking off from a light. It started right back up and went okay for the most part. Later, it started surging and cutting out, like it might die. It never did and I rode home. I attributed it to bad gas. I put new gas in (yes, from a different source and even with different 2 stroke oil mixed in) and rode to work today. I went about 7 miles before the same thing happened.....died after taking off from a light. Restarted fine, but there was the same surging and a noticeable loss of power after that. I could still hit 30 mph, but it was down on power. I'm not sure what to sure FEELS like a fuel delivery (aka Carburetor) issue, but from what I understand that carb is simply NOT adjustable. other thing I should mention just for accuracy....I bought a replacement gas cap (a while ago) from Staton since my original cracked (overtightened, apparently). This new gas cap came with one of those rings that you fold when instaling the cap so that once it's loosened, it just hangs down from the gas tank (meaning you don't lose the cap). Well this failed almost immediately and the ring and whatever amount of plastic that attached it to the gas cap is now sitting in my gas tank. I wonder if THAT'S causing my problem? I will try to fish it out when I get home today (unless it dies for good on the way home, at which point I'll try finding and removing that THEN! HA!). Anyone have a similar experience with their Mitsu TLE43? I DO have a spare spark plug in my bag if need be.....I'm not POSITIVE that I put the correct wrench in my bag though...DOH!

    Thanks in advance,


    PS - For the record, I have a little over 20 hours on this engine.

  2. Warner

    Warner Member

    Well, I went out at lunchtime and fished the plastic ring thingy out of my gas tank using a piece of wire. So we'll see if that's what was causing my problem on the way home.....I HOPE so! If not, I'll change out my spark plug and see what happens.....

  3. proline20

    proline20 Banned

    Good luck, interested to know what happens. Local mower shops might have a factory gas cap replacement...
  4. Warner

    Warner Member

    Problem solved! When I left work it was running so poorly that I knew I wouldn't make it home, so I stopped by our maintenance department and borrowed a spark plug wrench and used my SPARE (thank goodness!) spark plug. It was obvious upon removal of the old plug that it was the problem as a piece of carbon or something was shorting the electrode. Installed the new one and Wa-La! Runs great again. Well enough to hit 41 mph on my way home. (OK safety police...let me have it!)

  5. Happy Valley

    Happy Valley Active Member

    Next time you pull the spark plug shine a bright light into the cylinder and slowly rotate the engine with the pull starter cord. You can look for carbon deposit on the piston crown and read piston wash which can be even more informative than trying to read spark plugs to see how your engine is doing.
  6. Alaskavan

    Alaskavan Guest

    I was going to ask how many miles you had on it thinking that it might be starting to plug the spark arrester in the muffler. That happens sometimes with these around 300 miles. It's easy to pull the end off the muffler and yank the arrester out of there.
  7. Honda50

    Honda50 Member

    Yep, a carbon flake will do it to ya. Sounds like you need a little Top Engine Cleaner to soften up and 'burn' off carbon deposits in the combustion chamber. Looking down the spark plug hole is a good idea to get an idea of deposit accumulations. Another way, is to remove the carb and take a peak at the intake valve stem and backside of the valve head. Carbon deposits on the intake will inhibit and interrupt air flow as well as act like a 'sponge' for fuel. Carbon deposits can also collect on the piston's top rings and grooves. If excessive, this will limit ring travel and tension fit against the cylinder wall. Poor compression, excessive blow-by, loss of optimum power and poor fuel economy may result. Not to mention oil getting dirtier faster.
    Your local auto parts store will have something to take care of carbon deposits in the combustion chamber. Using it every now and then will act as excellent preventive medicine for the engine.

    Carbon deposits can cause detonation. This is very destructive to the piston, and rod bearing loads. Carbon also get mixed with the oil and acts to wear oil seals, leading to seepage.
  8. proline20

    proline20 Banned

    I use seafoam for my outboard 200hp 2 stroke. I mix 8 oz. in a gallon then run my engine at high idle for 15 minutes, wait 15 minutes, then 15 m inutes with clean gas again. The darn thing smokes out 1/2 the mosquitos in Florida, but the carbon is ALL gone...
  9. Warner

    Warner Member

    Mitsu TLE 43 - Any ideas?

    Okay guys....this may not be posted in the right place...and sorry if it isn't. I have a Mitubuishi TLE43 on my bike...and towards the end of last year I started having some issued with it. It would sometimes start revving, then hit a big flat spot...sometimes even dying out completely. I'd start it back up and start accelerating again and it would need to build up revs slowly. It is an intermittent problem is seems. I'm thinking some type of carburetion or fuel delivery problem. Has anyone ever had this happen to them? If so, what was the fix? There's not much to these engines, but my understanding is the carb on them is completely NON-adjustable. Any thoughts, ideas, suggestions are welcome!

    Thanks in advance,


    Looking at other posts, here are the things I am going to try:

    Clean Spark Plug

    Clean or replace air cleaner

    Remove spark arrestor (have 2nd muffler anyway!)

    Run some Seafoam Motor treatment through it to clean everything up

    Last edited: Mar 24, 2009
  10. Mountainman

    Mountainman Active Member

    hi Warner
    kind of watching your thread here -- not sure if I could be of much help
    realizing that you are pretty up regarding many MB matters

    just thinking here
    that if it's a gas problem -- would be I think -- lack of gas
    have you checked gas supply ? -- bowl letting plenty in ?

    rather than clean your spark plug -- got a new one just to try ?

    from up top the mountain -- have fun as you ride that MB thing
  11. Warner

    Warner Member

    MM, I will check the fuel line and tank if these other things don't help. And yeah, I DO have a spare plug. I am starting to think (hope?) that the seafoam may be the ticket....possibly carbon buildup COULD be the issue. I did mix it a little rich when the engine was new. Thanks for the suggestion....

  12. 5-7HEAVEN

    5-7HEAVEN Guest

    Let us in on your secret:detective:.

    How does a Mitsubishi engine push a bike to 41mph?:whistling:

    I have TWO mitsubishi engines on one bicycle and I haven't hit 41mph yet.:jester:
  13. 5-7HEAVEN

    5-7HEAVEN Guest

    Anyway, I had that same problem on "Bishi", the newer engine I installed up front. After 2 miles of running, the engine would quit cold turkey.

    :idea:When I opened the gas cap, I could start the engine again.

    The problem disappeared forever when I plumbed in my auxiliary reserve tank to both engines.

    Can you guess what the problem was?:detective:
  14. Warner

    Warner Member

    Well, I'm not able to CRUISE at that speed....that was a one time deal, down a slight hill....etc. But on the flats I CAN cruise at 35. I think one of the most overlooked factors when going for speed is the rolling resistance of the tires. Put those big a$$ balloon tires on for a comfier ride and guess what? The engine has to work MUCH harder to move the bike. I have Specialized Armadillo tires on, for puncture resistance and they roll pretty good. The tires I had on before rolled even better, but they were not good commuter least not for my debris-laden route.

  15. duivendyk

    duivendyk Guest

    Over long experience with 2 strokes,I learned that if engine acts up under power,intermittent running etc,the first thing to do is is to just to replace the plug with a known good one,the ignition is the most likely source of trouble in this situation.Looking at a plug is not good enough.Be sure to allways carry a spare one with you and of course a correct size plug wrench also.
  16. 5-7HEAVEN

    5-7HEAVEN Guest

    Warner, thanks for the tip on tires.

    are you running GEBE, Staton or DE? What's your ratio or roller size?
  17. Warner

    Warner Member

    JJ, I am finding myself quickly agreeing with you on this one. I removed the spark arrestor (screen) yesterday, cleaned the air filter (totally oiled up....that wasn't helping for sure, and showed how rich I mixed the gas initially), and ran some of that "seafoam" stuff in my gas tank. While it mostly ran good, I took a trip up to the local Home Depot (at night...I LOVE my headlight!) and on the way back it exhibited a hint of the problem. The problem exactly is that sometimes at low or mid range rpm's if you give it full throttle it will bog or hesitate. If I roll on the throttle very slowly, it will build the revs up and once at high rpm's it runs fine. I had this problem with a spark plug before (a piece of carbon got stuck right in the gap of the plug!). I think you're right...I've got two plugs (and I didn't look at the one installed OR try the other one), but I'm going to order 2 more and make sure I have the correct size wrench in my bags. I also fixed my kill switch - those little rotary switches that Staton sells are pretty tricky with the little spring and all!


    PS - Yesterday was really my first day back on the bike for anything meaningful.....I forgot how fun it is. And I also forgot how AWESOME my headlight setup is. It is truly as bright as a motorcycle headlight. It's a 55 watt driving light. I have about $100 into the whole setup, mostly in battery and charger cost.
  18. Warner

    Warner Member

    Mine is a Staton kit. Honestly, I don't remember the ratio. When I ordered the kit from Staton, I told him that I wanted to be able to cruise at 35mph and top out around 40 which is EXACTLY what it is capable of. Typical cruising speeds for me (depending on the incline) is between about 28 and 35 mph. It's fast enough to make the bike usable. Honestly, if it only went 20mph, I would find it a LOT less usable. It would just take too long to get anywhere. As it is, on short trips (5 miles or less) I get to my destination just about as fast as I do in my car.....and when there's a lot of traffic, I get there faster as I just keep going on the shoulder of the road, past all the stopped cars.


    PS - I can HIGHLY recommend those Specialized Armadillo tires! I have run over EVERYTHING imaginable and they do not flat. I don't know if you are familiar with them or not, but they are designed to be able to run over broken glass....there are videos out there of people smashing glass bottles and running them over, purposely lifting the front tire to land on the broken flats. I even went one step further and ordered these things called "spinskins" that line the inside of the tire....I wanted to be as sure as possible NOT to flat. I got a rear flat on the way into work one day and it SUCKED big time!