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Discussion Starter #1
Now this may all be in my head, but I'm sure it isn't.

It could also be because I've put on a few pounds, and am more effective as a sail in the wind as an America's Cup winning sailboat!

But ....

Over the past week or so I have started to feel as though there has been a slight loss of power in the bike? And I also noticed today that I got considerably less miles to a tank that I usually do. (106miles versus 120ish miles) I know for a certain fact that I hadn't ridden any differently during the last tank of fuel.

Acceleration up to 90mph or so still feels as strong as it was before.
But beyond that it does seem to tail off? And top speed is down by at least 10 to 15mph
I've also noticed the bike labouring more in top gear when going up an incline, I'm having to drop a gear, where previously I did not.

Only mods to the bike are a SC Projects CR-T slip on, and a Booster plug.

Now ... Because I am in denial (no, I don't mean the river) about my weight, I am inclined to point towards the booster plug being the cause of my problems (and no, I don't mean the eating problem either).

I'll be honest, I haven't really gotten on with the Booster plug since installing it. I think it ruins the throttle response, and doesn't fix the lean running issue to anywhere near an acceptable level. I actually made someone scream at a bus stop the other morning when it back fired. Honestly, the way it bangs and backfires, it sounds like a mobile ISIS training camp sometimes.

Maybe the drop in temperature is affecting the way the booster plug operates?
Yes the poor throttle and lean running was present during the hot summer months, but the power output / delivery wasn't an issue.
Now that it's some 15 to 20 degrees cooler than it was previously, is it feasible that it's affected the booster plug in some way?

I know the simple answer would be to remove the booster plug and see what happens. But what I don't want to do is lean the bike back out again to an unacceptable level and risk damage.

Any thoughts, similar experiences or suggestions??

For reference :-
I ride the bike daily, so any differences or changes are more apparent due to the familiarity of the way it rides.
And the bike is currently sat at 3500 miles, and was last serviced approx 1500 miles ago.
 

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Hello

I would revert back to original situation : remove the Booster plug and/or the SC slip-on.

These mods are not simple mods, they both interact with the fueling system of your bike and certainly have consequences on the bike performance. Booster plug, with its lower T° simulation, will give a richer fuel mix when the slip-on with its larger gas extraction may enforce the lean mix, because the engine will empty easier.

Better to try each mod one by one, I would say...
 

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From experience you will have a power boost going back to standard as you are currently running too lean which saps power and can overheat the engine.
Now this may all be in my head, but I'm sure it isn't.

It could also be because I've put on a few pounds, and am more effective as a sail in the wind as an America's Cup winning sailboat!

But ....

Over the past week or so I have started to feel as though there has been a slight loss of power in the bike? And I also noticed today that I got considerably less miles to a tank that I usually do. (106miles versus 120ish miles) I know for a certain fact that I hadn't ridden any differently during the last tank of fuel.

Acceleration up to 90mph or so still feels as strong as it was before.
But beyond that it does seem to tail off? And top speed is down by at least 10 to 15mph
I've also noticed the bike labouring more in top gear when going up an incline, I'm having to drop a gear, where previously I did not.

Only mods to the bike are a SC Projects CR-T slip on, and a Booster plug.

Now ... Because I am in denial (no, I don't mean the river) about my weight, I am inclined to point towards the booster plug being the cause of my problems (and no, I don't mean the eating problem either).

I'll be honest, I haven't really gotten on with the Booster plug since installing it. I think it ruins the throttle response, and doesn't fix the lean running issue to anywhere near an acceptable level. I actually made someone scream at a bus stop the other morning when it back fired. Honestly, the way it bangs and backfires, it sounds like a mobile ISIS training camp sometimes.

Maybe the drop in temperature is affecting the way the booster plug operates?
Yes the poor throttle and lean running was present during the hot summer months, but the power output / delivery wasn't an issue.
Now that it's some 15 to 20 degrees cooler than it was previously, is it feasible that it's affected the booster plug in some way?

I know the simple answer would be to remove the booster plug and see what happens. But what I don't want to do is lean the bike back out again to an unacceptable level and risk damage.

Any thoughts, similar experiences or suggestions??

For reference :-
I ride the bike daily, so any differences or changes are more apparent due to the familiarity of the way it rides.
And the bike is currently sat at 3500 miles, and was last serviced approx 1500 miles ago.
 

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From experience you will have a power boost going back to standard as you are currently running too lean which saps power and can overheat the engine.
Yes, a look at the spark plugs would certainly give a good information about the fuel mix leaness.
If they are very white, your engine is too lean.
 

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Maybe time to replace the air filter? Check and make sure nothing is obstructing air flow to or inside the air box. As noted in other posts the intake side of this engine is just adequate. Any restriction would no doubt be detrimental to overall performance.
 

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Discussion Starter #7
Could be the clutch starting to slip.
Looks like the was the issue.

I took the bike out yesterday with a pillion, and we were doing a lot of slow speed riding (looking at house's for sale) And I did notice a slight whiff of clutch while we were crawling along slowly.
The clutch slip was confirmed a short while later when I pulled away from a junction and the bike juddered and failed to pull away cleanly.

I adjusted the clutch this morning before coming in to work, and all seemed fine on the ride in.
 
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