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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 12-10-2012, 04:46 PM   #41 (permalink)
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sounds similar to what happened to me a months ago after cleaning my bike

inadvertently dislodged the vent hose that connects to the fuel line between the two carbies. when I say dislodge, the hose is meant to be clipped in position where it terminates to atmosphere. mine was sticking out on an angle and during high speed must have been creating a vacuum in it, thus preventing a flow of fuel into the carbies and creating a surging or no response to throttle as you describe

this hose not to confused with the tank vent hose

I would also be making sure the inline filter between the carbs is clear as well
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Last edited by bonza; 12-10-2012 at 05:16 PM.
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Old 12-10-2012, 04:51 PM   #42 (permalink)
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This does sound like the problem I had with a 1200 Trophy. I would be riding along quite happily until, without warning, the throttle would cease to have any effect. After waiting for about 5 minutes or so it would start and carry on for another while and do the same again. It was worse in really hot weather.

It turned out that when the fuel tank was put back the last time before the problem, one of the fuel lines became kinked so the fuel wasn't getting through properly. The lines were fine, apart from being twisted. Once that was sorted I had no more problems with it.

Hope you get it sorted soon.

R

EDIT: The fact that the breather pipes were Ok meant that when I opened the tank there was no sound of hissing as if the tank was suffering from a vacuum.

Last edited by Roynie; 12-10-2012 at 05:15 PM. Reason: Additional info.
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Old 12-10-2012, 05:29 PM   #43 (permalink)
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long shot ...kick stand safety switch .if it goes bad and thinks its still down and your motoring along it will cut out the spark .... theres a thread on unpluging it from harness and jumping with a paper clip harness end 3 female jump the outter end ones , by passes the kick stand switch everything else safety switches thinks its ok ...make a better jumper wire and try ... no cost .no loss ...
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Old 12-10-2012, 05:35 PM   #44 (permalink)
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try the crankcase breather hose to the air box..make sure its on the air box nipple ... mine pulled/came off when i rejetted carbs but looked like it was on ... leaned out the mix ..theres no clamp just pushes on and the vac. holds it .between 2 bulges in air box. would not go over 4000 rpm ..again a free check
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Old 12-10-2012, 09:33 PM   #45 (permalink)
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Wow, truly overwhelmed with the awesome support and generosity of this forum. Sorry for the late response I just got back from work. I’ll try and sort all of these suggestions and questions out here:

Over the last 2 months I have replaced and changed a few things. I live in hot humid south Florida. I have had a stalling/quitting bike for some time so I changed just about everything BUT the CDI box. The problems went away for a while but then came back recently. It happens more when the girlfriend is on the back but sometimes when I’m riding solo as well. I’m 200 LBS and girlfriend is 120.

For the problem of the bike just dying, turning off mid-ride (as described above) I will try the last thing I have not done yet, which is putting some rubber gaskets or washers under the rubber bumpers under the seat to raise it off the CDI ( I had previously cut a hole out of the underside plastic of the seat for the CDI box and thought that would be sufficient in case the seat was putting pressure on it but since that did not work, I will now go the extra step and try lifting the seat as well.) This doesn’t bother me as much as the new problem because the bike always started back up even mid ride on the highway while cruising at 70 mph... it’s dangerous but it didn’t happen that often and I tried so many fixes that didn’t work so I thought I would just have to live with it.

BUT the NEW problem and even more concerning one is the one I started this thread with. It is the non-response of the throttle while riding. Sometimes as some here have mentioned, the bike jerks haphazardly, and other times it is just completely non responsive. I don’t know why or how long it does it for and it seems to be completely at random as far as I can tell. I twist the throttle a few times maybe for 30 seconds (As the bike is slowly decelerating and running) as I coast over to the side of the road and then just as mysteriously as it stopped responding, twisting of the throttle works again and off I go.. Very dangerous and odd. Please note with this problem the bike does NOT turn off. The RPM’s are around 1000 as when idling.

Here are some of the recent things I have done to the bike if this adds any color to the problem to help.

Sealed and Relined gas tank
Cleaned petcock and all parts
Cleaned fuel filters
Changed spring for kick stand
Changed carb screws for other hex stainless steel ones
Changed front and rear brake pads
On both brakes I bled and changed fluid
Changed oil
Oil filter
Changed Gasket around pick-up-coil cover
New pick-up-coil
Cleaned carburetor float bowls and pilot jet and main jet and float bowl drain screw
Re-oiled and lubed all bolts and screws
Cleaned manifold and air box rubbers
Cleaned air filter
Cleaned battery
Sand papered gas tank fuel valve neck to get rid of pain chipping
Sealed and relined gas tank with caswells to get rid of rust
Replaced spark plug boots with nology ones
New spark plugs
Took off SAIS with conversion kit

Does that help with suggestions?

Thanks again for everyone who has helped. I’ll try just about anything at this point..

I can try some things as soon as tomorrow. All I want is a reliable bike and have never had one... very frustrating.

Cheers

RJ
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Old 12-10-2012, 09:51 PM   #46 (permalink)
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Quote:
Originally Posted by bonza View Post
sounds similar to what happened to me a months ago after cleaning my bike

inadvertently dislodged the vent hose that connects to the fuel line between the two carbies. when I say dislodge, the hose is meant to be clipped in position where it terminates to atmosphere. mine was sticking out on an angle and during high speed must have been creating a vacuum in it, thus preventing a flow of fuel into the carbies and creating a surging or no response to throttle as you describe

this hose not to confused with the tank vent hose

I would also be making sure the inline filter between the carbs is clear as well
One thing I left off that I also did was cut the fuel vent hose (I think it is called a fuel vent hose) at an angle, that comes out of the bottom of the bike (as forchetto had recommended doing in some thread) I did this also about 2 months ago in response to try and fix the sudden bike dying/stalling. Obviously that wasnít the problem and it didnít fix my issue. But now I have this NEW throttle problem so maybe this cutting of the hose has contributed to this new problem?

I only mention this after reading Bonzaís post. I wonder if that has something to do with it?
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Old 12-10-2012, 09:57 PM   #47 (permalink)
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Quote:
Originally Posted by RJ Triumph View Post
One thing I left off that I also did was cut the fuel vent hose (I think it is called a fuel vent hose) at an angle, that comes out of the bottom of the bike (as forchetto had recommended doing in some thread) I did this also about 2 months ago in response to try and fix the sudden bike dying/stalling. Obviously that wasnít the problem and it didnít fix my issue. But now I have this NEW throttle problem so maybe this cutting of the hose has contributed to this new problem?

I only mention this after reading Bonzaís post. I wonder if that has something to do with it?
By chance did you pull the hose to make sure there wasn't a blockage?
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Old 12-10-2012, 10:26 PM   #48 (permalink)
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with all that work you did to the tank, you did check the inline filter didnt you?

check out this post http://www.triumphrat.net/twins-tech...4-no-fuel.html
has a photo of it and location
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2007 Tuxedo T100.
AI & Snorkel gone, Dom Tourers, 40/120/1 shim 3 turns, TTP stage 1, Hagon Nitros, Dart screen, Pingel fuel valve, Monza gas cap, Avon Roadriders
I like a man who grins when he fights -
Winston Churchill
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Old 12-10-2012, 11:24 PM   #49 (permalink)
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Quote:
Originally Posted by bonza View Post
with all that work you did to the tank, you did check the inline filter didnt you?

check out this post http://www.triumphrat.net/twins-tech...4-no-fuel.html
has a photo of it and location
Yes, checked, pulled and cleaned...
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Old 12-10-2012, 11:25 PM   #50 (permalink)
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Quote:
Originally Posted by bluesforchallah View Post
By chance did you pull the hose to make sure there wasn't a blockage?
not as of the last month but when i did all of these updates and fixes i did check and all fuel lines and filters were clean and clear...
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