Scrambler Rough Running or Normal for a Torquey Twin?

Had this in the past on one of my bikes and found it was a plug breaking down under normal use and ok when thrashed.

 

Hello Si, the following comments are based on your bike being an 865cc Scrambler Efi in std. condition:

These bikes have anti-pollution systems which change their parameters dependant on throttle position. In very simple terms 0-6% is set 1 and 7-100% is set 2. The cross-over point between the two points of parameters is not always as smooth as we would like and gives a less-than-smooth throttle response. This can be completely cured and the bike's overall performance improved by:

1. Removal of the 'Air injection' system - this system injects fresh air into the stream of of exhaust gases to reduce pollution but also cause popping on overun;

2. Removal of the O²sensors in the exhaust downpipes allied to a new ECU map. The most popular supplier of this kind of aftermarket support being Triumph Twin Power.

With a change in airflow into the engine and more ope exhaust pipes plus a new map your bike will fly much more smoothly.

 

What he says ☝

 

Hi Si,the first thing to say is that it's best to do all envisageable engine mods at the same time,so you just need to buy 1 ECU map.

The classic package of popular mods would be:

1. Inlet side of engine - allow the engine to breath better by removing anything that slows the airflow such as rubber trumpet, filter retaining cap; airbox baffle plate. Then install a 'Breath' cover plate and a DNA airfilter;

2. Remove the AI system completely. Remove the O² sensors completely;

3. Exhaust side of the motor - install your preferred set of open aftermarket pipes;

4. Purchase and install new map appropriate to your bike and modifications. At the same time delete the AI system in the tickbox of the ECU reader program "TuneECU".

Now go out and ride your heart out - don't go home for at least two days !!!!

Re the UK MOT, motorbike exhaust pollution levels are not checked, the only aspect the MOT guy will be interested in is the level of exhaust noise. So keep your std. pipes for MOT day.

 

i was advised to avoid supermarket fuels and this can cause rougher running

this was a very specific from my dealer on collection

I have taken his advice and mine seems okay 700 miles in

 

Yeah I've heard a few story's about bad supermarket fuel especially Tesco.

 

Budget fuel is exactly budget!! I always where possible go for super unleaded at proper fuel stations as the bike rides quicker, has more umpf and the range is better so it actually isn't dearer at all!!

 

I also find that my bike loves more expensive fuel If you go the route of modifying ask dealer how warranty will stand, if you have one.