Triumphrat

Mike The Bike · 06-11-2009, 08:31 PM

Hi Im still having porblems with the 99 1200.
Please help before I burn it.
So far its had
new coils & leads
fuel line
vac lines
carb ballance
fuel tap diaphram
Its been back to a main dealer twice. Its O.K. untill it gets a long run then it cuts out below 1500 revs.

The dealer was usless, having paid for work. Took it back to be told it needed the same work. Ie. we needed to reroute the vac lines. it needs the carbs ballanced / cleaned.

I did run out of fuel so I am woried I may have dirt in the pilot jets?

It was suggested it might be tight valves.

Any ideas? Its a great bike to ride everything else is fine. It pulls well its just the stalling.

Mike

Mark62 · 06-11-2009, 11:38 PM

It sounds like you have done the "easy" things. Do a compression check, you might have a bad cylinder. Have you checked for vacuum leaks? Spray "carb cleaner" around carbs and rubber boots (to head) and listen for an RPM increase. Spray in area of head gasket before she gets too warm.
Hope this helps
Mark

Trophymick · 06-12-2009, 05:09 AM

Crank position sensor?

Trophymick

greybeard · 06-12-2009, 10:57 AM

Quote:

Originally Posted by Mike The Bike

Hi Im still having porblems with the 99 1200.
Please help before I burn it.
So far its had
new coils & leads
fuel line
vac lines
carb ballance
fuel tap diaphram
Its been back to a main dealer twice. Its O.K. untill it gets a long run then it cuts out below 1500 revs.

The dealer was usless, having paid for work. Took it back to be told it needed the same work. Ie. we needed to reroute the vac lines. it needs the carbs ballanced / cleaned.

I did run out of fuel so I am woried I may have dirt in the pilot jets?

It was suggested it might be tight valves.

Any ideas? Its a great bike to ride everything else is fine. It pulls well its just the stalling.

Mike

check that the choke mechanism is not sticking, or the cable is badly adjusted .I had the same problem on my 900.It only needs the choke to be fractionally closed to cause your symptoms when hot. greybeard.

Mike The Bike · 06-12-2009, 01:20 PM

I forgot to mention I replaced the carb inlet rubbers, and replaced the air filter with a K&N.

I will try all your ideas. Thank god you guys have some new ones!

Mike

narrowminded · 06-14-2009, 09:52 AM

Air, fuel, electricity. These things are pretty simple, we make them complicated.
Igniters
Crank sensors
Ignition cut-offs
Etc,etc.
Sounds like you've handled the electrical side other than the crank sensor thing.
The air issue is pretty straight forward, not much to go wrong there other than the aforementioned choke adjustment.
That leaves the fuel.
You've done new fuel and vac lines, petcock diaphram, carb work.
She starts and idles when cold and won't idle when hot. Does she start easily when hot?
Either it's temp related or a time issue.
If temp than bring the electrics back into play.
If time I tend to go fuel.
Fuel tank vent in the cap. Over time a vacuum is created insde the tank, restricting output.
Carb fuel filters, may possibly be restricting fuel flow.
These things are fed by vacuum and gravity, any restriction along the line will show up at idle when the vacuum level is the lowest.

Please excuse the long reply, thinking as I write.
Hope it's a simple fix. The problem with Trophy's is that Techs always go for the most common repairs, coils, carbs, ......
These are also expensive. They'll spend our money in a trial and error approach. I go the other route, slow down and investigate.

Carry on!

phpbiker · 06-14-2009, 01:02 PM

A friend with a daytona 900 has an identical problem I just posted in the daytona section for him..

It seems to me that if it was the tank valve then fuel starvation would kill the engine completely and the rev's would be dependant.

Time and temperature and inextricably linked, which is part of the problem. That mechanical and electrical.
Over heating ignition coils, would cause a misfire most times.
And as all the other things have been replaced the crank position sensor (pickup?) has to be the answer.. ???

narrowminded · 06-14-2009, 03:35 PM

"It seems to me that if it was the tank valve then fuel starvation would kill the engine completely and the rev's would be dependant."

Not nessesarily. The greater vacumm could be overcoming the resistance of the vent blockage. Simple test. Is there suction when the filler cap is opened?

It's probably not that simple of a cure but it's free to check it out.
Carry on!

phpbiker · 06-14-2009, 06:47 PM

Quote:

Originally Posted by narrowminded

"It seems to me that if it was the tank valve then fuel starvation would kill the engine completely and the rev's would be dependant."

Not nessesarily. The greater vacumm could be overcoming the resistance of the vent blockage. Simple test. Is there suction when the filler cap is opened?

It's probably not that simple of a cure but it's free to check it out.
Carry on!

Ummm you could be right on both counts of course. But unless I am wrong the intake vacuum draws fuel from the bowl but only gravity is involved getting the fuel into the bowl, so more vacuum wouldnt effect the fuel delivery unless it was a tap problem. The low RPM might not be enough to either open the vacuum taps ?

Dammit..it still does it on prime so it cant be the vacuum tap

Mike The Bike · 06-14-2009, 06:54 PM

I am hoping its the choke cable as the bike starts with less choke than any other bike.

I will also try opening the gas cap. I did clean the fuel filters but that was before the dealer got to it.

Thank for your replies they are a huge help.

Mike