What is the T-Mod on a klr 650?

Discussion in 'Thumpers' started by ogklx400, Apr 15, 2008.

  1. ogklx400

    ogklx400 Long timer

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    Just wanted to no what the T-Mod is a what it does for the bike thanks :D
    #1
  2. Silver King

    Silver King Maita'i roa ae!

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    It makes your bike into a KLT! Thank you. Thank you. I'll be here all week. GONG!

    Seriously...this mod provides an alternative vent for the carb (up high) in the event of a water crossing or heavy rain.

    Too lazy to search, but I'm sure there's a thread here somewhere.
    #2
  3. RAZR

    RAZR u may run the risks my friend but I do the cutting

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    it allows you to go thru water crossings.
    it takes under 5 minutes and costs $1.60.
    if its not on this forum, go to www.klr650.net
    #3
  4. judjonzz

    judjonzz Beastly

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    I first discovered the T-mod on a klr forum, but there are plenty of other bikes that could benefit. In the '90s, when the Funduro was a new thing, the book on them was that they didn't like to run in the rain. Dealer techs scratched their heads over that one, and one friend sold hers because she got sick of her bike's balkiness whenever it got wet out. What do you want to bet that a T-mod would have fixed her right up?
    #4
  5. GB

    GB . Administrator

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  6. ogklx400

    ogklx400 Long timer

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    Thanks for the info everyone you guys an gals are great..:D :D
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  7. jeff_in_rc

    jeff_in_rc A DRZ kind of guy

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    I'll second that statement! I have done the T-mod on almost every bike I've ridden since I do cross streams a lot.

    What you are doing is adding a "T" to the vent lines on the carb and running one up high under the tank or seat to allow the carb to vent while the line down low is in the water. If you don't the line down low will be blocked by the water and your bike will starve for fuel and die! Not a good thing in a creek.
    #7
  8. Beezer

    Beezer Long timer

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    Variations on the "T" mod are.... take a leather punch & put a hole in the vent line big enough to slide in a smaller tube (like a battery drain line size), no fitting required...... or punch the hole & forget the extra line....... or pull off the line all together..... or re-route the original line so it points up under the seat and punch a drain hole in the low spot.
    #8
  9. RAZR

    RAZR u may run the risks my friend but I do the cutting

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    i wouldn't do that. you'd have gas all over your engine, tire, chain, etc.
    i would just do the mod properly and forget about it.
    it seriously takes under 5 min, you get the T and the tube from a hardware store( or an auto store) and your done.
    #9
  10. XS500RUS

    XS500RUS Been here awhile

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    I figured I'd bring this back from the dead rather than starting another thread.

    I just bought a '99, and was reading up on some common modifications, this being one of them. My question is: If this is a carb VENT tube, not the overflow tube, how serious is the risk of having gas come out through this tube? If it is indeed strictly a vent for air, couldn't I just reroute the vent up higher without worrying about gas running all over the bike? TIA

    Looking forward to some water crossings:evil
    #10
  11. XS500RUS

    XS500RUS Been here awhile

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    To update that last post, I rode some pretty gnarly trails on the KLR with my brother (who actually rode a Cb360 shod with knobby tires :eek1 ) and it only stalled once right after I went through a fairly deep (2 feet) mud hole. I learned to just keep the revs up a bit after each crossing and had no more issues, it idled and ran fine. I's still like to do the modification for piece of mind, and am still wondering if its OK to just route the tube higher instead of splitting it.
    #11
  12. Hootowl

    Hootowl Long timer

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    I did run the tube higher for some months and eventually did the split
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  13. tpar1220

    tpar1220 such a pud..

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    if you dump the bike on it's side, gas can run out of every tube on the carb. if you just run the tube high... when you pick the bike back up... that gas can't get out of the tube and will be a real bitch to restart.

    just cut the line and install the t... run the 2nd line up under tank somewhere.
    #13
  14. XS500RUS

    XS500RUS Been here awhile

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    Ahh, that makes sense. Thank you, I'll do the mod next weekend then.
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  15. britman

    britman Britman

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    Ummmmmmmmmmmmm,

    Why does everyone on a KLR seem to run the extra gas vent line on the side of the bike where the exhaust is???
    #15
  16. Tsotsie

    Tsotsie Semi-reformed Tsotsi

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    It is not needed on 08+ KLR's - they are vented up and back under the seat.
    #16
  17. dpifko

    dpifko Can u smell the It's Its?

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    Is it possible there's something equivalent on the 08's?

    What are the signs that the vent has been blocked by water, even on the pre-08's? Just water in the cylinder or a blackened spark plug?

    I had a bad experience last weekend and can't figure out why my bike stalled mid-river. I enter this video just after 1:20 (orange jacket - please keep your lack-of-fashion-sense comments to yourselves ;-) ). The bike just stopped, despite my not going down.

    <iframe src="http://www.youtube.com/embed/zcCisdemYxk" allowfullscreen="" width="560" frameborder="0" height="349"></iframe>


    If anyone has a diagnosis I'd be much appreciative.

    Clues:

    - after the stall, the bike would turn over but not start
    - drained the bowl on the carb using the valve on the bottom. no good.
    - all fuses intact
    - no water apparent in the airbox/air filter
    - no amount of bump starting would get it going
    - shorted the sidestand switch. no good.
    - wouldn't start after 2 hours, 2 days, or 2.5 days plus a full battery charge

    (my favorite)
    - brought it into the shop and put it up on the lift - started (it figures - scared of the mechanic). Major backfiring, then stalled
    - new spark plug + 5 minutes of running and it worked off and on. Cooled down again and

    It looks like the problem the t-mod solves, though it's an 08.

    Thanks,

    Daniel
    #17