Triumphrat

TorqueyT · 01-15-2005

Have been thinking about asking this question for a while, finally getting around to things:

When I twist the throttle on my Tiger, I tend to have to be very careful at low revs, as when the injection kicks in (this is the dealers explanation) it does so very sharply, and the bike takes off accordingly. More of an issue when I decelerate and come off the throttle, I hit the same spot at which point engine braking suddenly kicks in quite hard. (Noticeable when the pillion comes crashing into me.) As a result I have to generally be very gentle on the throttle at the lower revs, something I'm slowly getting used to.

Is this normal, is there something I can do to smooth things a bit? Not really a problem out on the road, more when doing town/slow riding.

TorqueyT · 01-15-2005

Have been thinking about asking this question for a while, finally getting around to things:

When I twist the throttle on my Tiger, I tend to have to be very careful at low revs, as when the injection kicks in (this is the dealers explanation) it does so very sharply, and the bike takes off accordingly. More of an issue when I decelerate and come off the throttle, I hit the same spot at which point engine braking suddenly kicks in quite hard. (Noticeable when the pillion comes crashing into me.) As a result I have to generally be very gentle on the throttle at the lower revs, something I'm slowly getting used to.

Is this normal, is there something I can do to smooth things a bit? Not really a problem out on the road, more when doing town/slow riding.

whoa · 01-16-2005

I have an 01 but don't experience anything like this. I've read some issues with problems with throttle linkage so your issue may be related to that.

whoa · 01-16-2005

I have an 01 but don't experience anything like this. I've read some issues with problems with throttle linkage so your issue may be related to that.

tango · 01-16-2005

TorqueyT,

My 955 suffered from that as well, which like yours made it slightly uncomfortable for the piilion. I had the latest (then) tune downloaded, no' 19, and it smoothed things out, also I think the freer flowing exhaust has helped in this respect.

tango · 01-16-2005

TorqueyT,

My 955 suffered from that as well, which like yours made it slightly uncomfortable for the piilion. I had the latest (then) tune downloaded, no' 19, and it smoothed things out, also I think the freer flowing exhaust has helped in this respect.

Timtiger · 01-18-2005

Hi TorqueyT,
A few questions of you.
What version ECU map are you using?
What Exhaust can do you have?
What have you looked at so far?

I would suggest you look at a few things.
1. Check the throttle cable is operating properly, not binding, kinked or too loose. There is adjustment under the switch cluster.
2. Ensure the throttle body (butterfly bodies) are not loose ans suggested by Whoa.
3. Find a good mechanic (not just a 17yr old apprentice at the dealer) by 6talking to them to assess their skill and interest. Get the throttle butterfly valves very carefully synchronised. This means that they all close and seal EXACTLY together. Triumphs are sensitive to this and lazy mechanics get this wrong.
4. Ensure the latest ECU tune is installed and adjusted carefully for whatever exhaust can you have.
5. Consider installing an O2 sensor bypass. This $30 part can resolve this issue totally. This problem is worse on some bikes than others an appears as a surge around 2,000 to 2,500 revs. It is a 10 minute fix.

Check this thread: Latest Tiger Tune
It has a detailed discussion about ECU tune versions. See page 3 for info on the O2 sensor bypass. Those that have them have reported very good results.

Good luck and please report back what you find.Latest Tiger Tune

Timtiger · 01-18-2005

Hi TorqueyT,
A few questions of you.
What version ECU map are you using?
What Exhaust can do you have?
What have you looked at so far?

I would suggest you look at a few things.
1. Check the throttle cable is operating properly, not binding, kinked or too loose. There is adjustment under the switch cluster.
2. Ensure the throttle body (butterfly bodies) are not loose ans suggested by Whoa.
3. Find a good mechanic (not just a 17yr old apprentice at the dealer) by 6talking to them to assess their skill and interest. Get the throttle butterfly valves very carefully synchronised. This means that they all close and seal EXACTLY together. Triumphs are sensitive to this and lazy mechanics get this wrong.
4. Ensure the latest ECU tune is installed and adjusted carefully for whatever exhaust can you have.
5. Consider installing an O2 sensor bypass. This $30 part can resolve this issue totally. This problem is worse on some bikes than others an appears as a surge around 2,000 to 2,500 revs. It is a 10 minute fix.

Check this thread: Latest Tiger Tune
It has a detailed discussion about ECU tune versions. See page 3 for info on the O2 sensor bypass. Those that have them have reported very good results.

Good luck and please report back what you find.Latest Tiger Tune

TorqueyT · 01-19-2005

Thanks for replies guys.

Will look into the throttle cables and body (bike in it's winter hideaway at the moment). Will also have another chat to the mechanics at the dealers.

Regarding can - this is still the original that came with the bike, and the tune was also checked and found to be the latest one last time I had a chat with the mechanic and his game boy.

I did read the threads in question, and was planning on getting th O2 bypass unit. However, I then realised my Tiger doesn't have a closed loop system, i.e. there is no O2 sensor. I believe the changeover must have come with the upgrade to the 955 engine.

Cheers

Timtiger · 01-19-2005

In the case that you don't have the O2 sensor, her is another thought to ponder.

I dynoed my bike prior to installing a Dynojet Powercommander. This showed the fuel injection map is set very lean around 2,000 to 3,000 RPM with the apparent intention of passing emission testing. This may be basis of the surging. You can invest less than $100 on a dyno with an exhaust gas analyser and test this theory. I beleive the tuneboy software can improve this, and the Powercommander certainly fixes this problem and gives 110HP at the rear wheel! - and a very very smooth power curve ie no surging at all.
The new PCIII USB units also have a user adjustable setting for a virtual "accellerator pump" that gives an extra fuel squirt when the throttle is open quickly. Great fun to play with and it really helps the bike take off from the lights - and pull wheelies.

More importantly it actually makes for a very smooth tak off without a power lag then a surge. Not cheap, but I love it. Powercommander accellerator pump feature