Triumphrat

Cecfelix

Why! Why! Why! I just don’t get it. I ride a 1995 Triumph Thunderbird. I bought it used, with a shot motor. The timing chain cut through a tension block. The bike jumped timing and, well, did a lot of damage. I took the bike to the only dealer around me and spent 2 grand to get it fixed. I got it back and for the rest of last season the bike did not run right. I had to take it back several times and each time, no luck. The dealer keeps finding more and more reasons on why my bike is not running right; they say it’s fixed, I get it back and it still does not run right. They say it’s because the jets, air cleaner, and mufflers are not stock. The jets are 97.5, air cleaner is K&N and the mufflers are reverse cone megaphone. I see pics of lots of TB running jet kits and so on. So why can’t my dealer tune my bike to what it has already? Why do I have to spend more money putting all stock parts back into the bike? I just don’t get it. If any one reads this and thinks all stock is the way to go or if you think my dealer is taking me for a ride, I would like to know your opinion. Thanks Felix

My bike runs real choppy at low RPMs. It smoothens out at about 4000, so it’s tuff to ride when the speed limit is 20 to 25 mph. It pops and backfires a lot. I’m only getting about 25 mpg of gas and my exhaust smells like gas. It was doing all this the last time I put it in the shop and that’s when they changes the jets they were 110, and they put the 97.5 in, the shop manager tried to talk me in to stock pipes, air box, and jets, I asked them to tune it to what was in it and it’s still running choppy and sucking gas up. I’m at my wits end right now I love the bike and know it should run a lot better then it is well was I cant get it to start now and it’s going back in to the shop on the 17th, I’m no mechanic and I’m not sure if the dealer is robbing me with the now close to 3 grand I have spent (I just added all my receipts) and one more trip to the shop I pray I get it back right thanks for all your help. Felix





[ This message was edited by: Cecfelix on 2007-04-15 14:23 ]

parrycm

What are the symptoms? What does it do?

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Chris

"Panniers can never hold everything you want, but they CAN hold everything you need."

jimmyj900

In what way? Is there a specific rpm range that's a problem area?

Fill us in and we'll work on it.

Jim

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jimmyj900

As far as the jetting goes, the stock setup is:

Main Jets have R and 90 on either side of the hole

Pilot Jets have R and 40 on either side of the hole

Needles have 5E1 on them and are set on 3rd slot from the top with no spacers

Idle Mixture screws are at 2 3/4 turns out


If you have the stock airbox (not individual filters) then the stock jetting should be good with the aftermarket mufflers. The 97.5 main jets might be a bit rich -- but not horrible.

Jim

[ This message was edited by: jimmyj900 on 2007-04-15 11:36 ]

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Cecfelix

My bike runs real choppy at low RPMs. It smoothens out at about 4000, so it’s tuff to ride when the speed limit is 20 to 25 mph. I’m only getting about 25 mpg of gas and my exhaust smells like gas. It was doing all this the last time I put it in the shop and that’s when they changes the jets they were 110, and they put the 97.5 in, the shop manager tried to talk me in to stock pipes, air box, and jets, I asked them to tune it to what was in it and it’s still running choppy and sucking gas up. I’m at my wits end right now I love the bike and know it should run a lot better then it is well was I cant get it to start now and it’s going back in to the shop on the 17th, I’m no mechanic and I’m not sure if the dealer is robbing me with the now close to 3 grand I have spent (I just added all my receipts) and one more trip to the shop I pray I get it back right thanks for all your help. Felix

jimmyj900

Check the float height (I don't have a spec for it) and make sure they're even. Also check the pilot jet sizes and mixture screw adjustments.

I'd suspect the ignition from low rpm problems, but since the carbs have been apart that's the place to start.

Jim

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ecrabbit96

I agree, start by getting the carbs right. My 01 Adv- 98 main jet, 38 pilot, float hight I believe is around 12mm when it was stock.

BigAl8295

First thing you need to do is find a new dealer!

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ecrabbit96

The book calls fot 1-1.5mm above the seam. Float height.
CVK

jimmyj900

ecrabbit96, there should be Mikunis on the 95 TBirds unless they've been swapped.

Cecfelix, how many miles are on the carbs?

The Mikunis had a peculiar wear problem in that the needle rubs against the needle jet and wears out both parts. Check your needles for flat or 'shiny' spots on the tapered portion and also for wear in the needle jets.

As I remember it, the wear causes excessive fuel consumption and rough running in the rpm range you're talking about

There's a cutaway drawing of a generic CV-type carb in my photo album that will show you where the needle jet is located -- above the main jet.

Jim

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