aggressive off road riding? Lacking power?
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  1. #1
    Member a_frye's Avatar
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    I know there are a lot of variables to answer this question...



    but the other day I took out my new (to me) tw to do a nice jeep trail up in the colorado mountains....This is a trail my stock jeep had no problem climbing, even in 4x4 high....8000' msl



    Anyways I got to a slightly steeper section and the bike wouldn't climb it....stalled out, totally surprised....I went back down and had a run at it and again it stalled....full throttle and 1st gear....I was disappointed...tank was full....I thought these bikes were torque'y trail monsters....am I missing something here?



    Anyone else experience this? I'm 150 lbs, and was running a 47th rear sprocket (i know this would reduce my torque, but not to the point where the bike wouldn't climb up a moderate slope....)



    Maybe include some pictures of nasty trails you have climbed? Any suggestions? I could throw the 50th back on, or my 54th....but I do a lot of highway driving to get to the trails....

  2. #2
    Senior Member Phantom99's Avatar
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    I would suspect that you are not jetted properly for that altitude. If you are too rich that could easily explain it. Mine runs fine and never stalls at that altitude and I'm running 15/47. I reported on that a couple of months ago.



    There is a lot of info on carb jetting here.

  3. #3
    Senior Member evan's Avatar
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    I run 15/47 sprockets with stock tires and stock jetting and have climbed some pretty steep trails. Traction was more my concern than power....I have ridden some trails (not steep) at 8,000 feet and can't definity feel the power being way down so I think phantom99 is right that you need to lean out your carb for that altitude.
    Mike Carter. Woodland, California (NorCal). '89 Tw200 (Black Widow Edition). Blood red Jimbo shield, Cycleracks, Nuvi 500 GPS, Kolpin fuel pack jr., D shield bark busters, 55t rear sprocket, Golden boy front tire, Ricochet shield.

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  5. #4
    Member -Jake-'s Avatar
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    Quote Originally Posted by importmech View Post
    I run 15/47 sprockets with stock tires and stock jetting and have climbed some pretty steep trails. Traction was more my concern than power....I have ridden some trails (not steep) at 8,000 feet and can't definity feel the power being way down so I think phantom99 is right that you need to lean out your carb for that altitude.


    Yep I'll bet it is the jetting. I did some hill climbs in Ohio that guys on a 450 Honda and a WR250 were having a helluva time with. I'll bet they were embarrassed an ugly old TW200 climbed right up it.

  6. #5
    Senior Member iowatdub's Avatar
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    Sounds like jetting. Hill climbing is the thing i feel like the tw is very good at. As long as the traction is there the tw never lets me down. I have stock gearing and there is a trail near the house that goes to a fishing pond near town that is fun. I need 1st gear and i slide forward on the seat a bit and it climbs right up it. Im at around 1000 asl in iowa.
    2008 TDUB

  7. #6
    Senior Member Woofhound's Avatar
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    might want to do a compression check also. my TW ran good at 6-8K' with stock jetting. you didn't mention the the year or the mileage on the bike. valves been adjusted lately? ever? woof
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  8. #7
    Member a_frye's Avatar
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    '98 with 2300 miles...all stock and never adjusted I reckon...Should I have the valves adjusted? All the reading about jetting has me slightly confused...any advice? Shim the needle? or a lower number like 125 for altitude? Seems like folks replace the stock screws with nicer ones...Thanks

  9. #8
    Senior Member old mad max's Avatar
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    My wife and I have stock 06 dubs.... Three weeks ago we were riding in tenn. up to 5,000' with no problems... Not even a hiccup.. We found out how great they take curves too.. Tail of the dragon was a riot on our dubs.OMM.

  10. #9
    Senior Member lizrdbrth's Avatar
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    Quote Originally Posted by a_frye View Post
    '98 with 2300 miles...all stock and never adjusted I reckon...Should I have the valves adjusted? All the reading about jetting has me slightly confused...any advice? Shim the needle? or a lower number like 125 for altitude? Seems like folks replace the stock screws with nicer ones...Thanks




    NONE of the above, 'cept the valve adjustment.. Clean your air filter while yer at it. That alone could contribute heavily to what you're experiencing.



    Your '98 has the old-style slide carb. It should have a 114 main jet and if the bike was originally sold in your area it may have a 112 "high altitude" jet that was dealer-installed when new. The numeric jet requirements for your carb don't relate with the much larger numbers used on the later carbs.



    If a P.O. got on this forum and monkeyed with it the carb could have almost any jetting. You'll need to take it apart and check the main sizes. One tipoff to the P.O. messing with it can be the removal of the soft plug over the mixture screw. If someone's messed with the jetting they'll usually mess with the idle mixture, as well.



    Ignore most of what you've read about carbs on here because for the most part it has nothing to do with your carb OR your location, and very few posters distinguish which carb they're referring to. If you install a 125 jet and open the mixture 2.5 turns as is typically recomended in many of the carb threads you probably won't get out of your driveway.



    I live at 4,000 feet and run the old-style carb. The mean average in most of Colorado is considerably higher. I have to compromise with jetting because within an hour's ride from home I can either be at sea level or 10,000 feet. I run a 116 to prevent going overly lean at sea level and that covers me until about 8,000 feet. After that I have to tolerate a bit of diminished horsepower, but not to the extent you've described. It would run a lot better with a 114 up there but the point others have made is that there ain't much a TW won't crawl over in first gear even at 10,000 feet if it's running right.



    I guess what it comes down to is that if your jetting hasn't been changed your bike just isn't running right. First check the jetting and make sure someone hasn't increased it. Give the carb a full cleaning and set the mixture back to stock if it has been changed, leave it be for now if it hasn't and remove any shims which may have been installed by the P.O. Most of the advice offered here is directed toward gaining max performance at more reasonable elevations where the air isn't so thin.



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  11. #10
    Senior Member small's's Avatar
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    My 98 made it over imogene pass "over 13,000 feet" and all the other passes in the ouray, silverton, telluride area with the stock 114 jet. I am 150lbs and was running 14/47. Mine didnt run that well over 9,000ish feet but she made it while sputtering a bit. Looking forward to taking the 07 out there and seeing how the newer carb does at altitiude.

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