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Online RedMerle

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Slight loss of power at motorway speeds
« on: June 04, 2020, 08:56:19 PM »
I went for a trip down to Truro today and enjoyed the fact that I could ride in light rain, without waterproof over trousers, with no sign of getting wet  :028:

However, I had one odd thing crop up. Between around 3,500 to 4,000 rpm, I was finding a loss of power, very like the feeling when I'm just starting to run out of fuel, or if the tank breather is blocked and causes a stutter in the fuel supply. Riding around at lower speeds, it's absolutely fine.

Any thoughts as to what to look at? Is there a tank breather pipe that I should be checking?

Thanks in advance  :028:

RM
After 7 years of riding the Tiger 1200 (the Trophy's disreputable hooligan little brother!), itís  just been joined by a blue Trophy too!
(Final colour TBA 😁)



Online RedMerle

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Re: Slight loss of power at motorway speeds
« Reply #1 on: June 04, 2020, 10:29:02 PM »
Okay - Iíve read up on how a modern tank cap breather works (fascinating stuff), removed my petrol cap, dismantled it, checked, cleaned and am just reassembling. All in apple pie order, so itís not that...
After 7 years of riding the Tiger 1200 (the Trophy's disreputable hooligan little brother!), itís  just been joined by a blue Trophy too!
(Final colour TBA 😁)



Offline Coconut

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Re: Slight loss of power at motorway speeds
« Reply #2 on: June 05, 2020, 07:12:32 AM »
I don't think it will be this, but it is worth checking and is easy to do :

Check that you are not "riding" the Rear Brake pedal or Front brake lever,
ad make sure that the rear Brake Pedal Light Switch is adjusted correctly
so that it does not remain ON while riding.

Owners Handbook - Page 67 :
Brake Use
At low throttle opening (approximately 20į), the brakes and throttle can be used together.

At high throttle opening (greater than 20į), if the brakes are applied
for greater than 2 seconds the throttles will close and the engine speed will reduce.

To return to normal throttle operation, release the throttle control,
release the brakes and then re-open the throttle.

Another thing to check ( but more difficult and timely to accomplish )
is that the that the Throttle "butterfly" valves are operating freely,
and are not gummed up and potentially sticking, and that the Throttle bodies
are sealed correctly at their rubber transition pieces. 

Cheers  :821:



Online Saddle Tramp

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Re: Slight loss of power at motorway speeds
« Reply #3 on: June 05, 2020, 01:36:20 PM »
Based on your description, I would first suspect a fueling issue.
Before you investigate Mr. Coconutís suggestion, I would also consider the following:
How old is the fuel in your tank?
Is your fuel filter in need of replacement?
Condition of spark plugs, caps and wires?
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Offline earthman

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Re: Slight loss of power at motorway speeds
« Reply #4 on: June 05, 2020, 05:39:03 PM »
*Originally Posted by Saddle Tramp [+]
Is your fuel filter in need of replacement?

That's certainly a good suggestion, it's hidden away inside the petrol tank so easily forgotten about/harder to replace than the old fashioned type of fuel filter that use to be located somewhere along the fuel pipe.

Online RedMerle

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Re: Slight loss of power at motorway speeds
« Reply #5 on: June 05, 2020, 05:57:15 PM »
Thanks for the helpful suggestions everyone  :821:

Itís certainly fresh fuel as Iíve drained the tank twice already 😁. ďDrainedĒ, as in ďusedĒ, rather than stuck in the garage fixing it!

Still investigating at the minute, but itís actually much more minor than it sounded in my original post. Certainly something that I can live with for a bit until itís time for the first major strip down  :028:

Thanks again all.

RM.
After 7 years of riding the Tiger 1200 (the Trophy's disreputable hooligan little brother!), itís  just been joined by a blue Trophy too!
(Final colour TBA 😁)



 



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