Snatchy Throttle (2002 955i)

Hi All,

I have mooted this question before, but didn't get a denotative answer - please forgive the duplication...but it is rainy, so this is a good weekend to tinker...

On my 2002 955i I would say that the throttle is 'jerky'. By this i mean that at slow revs, filtering, setting the throttle pull away slowly etc, they throttle is either zero or "on" (I say "on", I only mean a bit) but it is enough to jerk the bike...

I appreciate that any bike or car control is a subtle interplay between clutch and throttle delivery...but it is difficult at low speeds to gently bring the throttle in.

At speed, or once on the move it is fine, or certainly less noticeable.

I would imagine these are 16yr old throttle cables. I have tried squirting lube down the cable outers.
I do have some free-play in the handlebar grip - not only is it heated, but also to allow for turning the bars.

Any specific thoughts?

I have had the bike 6 months now an I hoped I would be able to have a little more control of this surly beast...but I waver between almost stalling, and over revving at pull away...

Should I just spend (another) 20 quid and just replace the cables...?

 

Thank you colC that's really thorough and useful! Some bits are beyond my current knowledge but others sound doable.

Mods wise I think it is all fairly standard. It does have an after market can - but not by me... however my local triumph chaps (Hughenden M40) checked the mapping for me a few months ago when I changed the baffle.

The air filter is part of my servicing regime and on the list...I've not delved in there yet. It may or may not be aftermarket - how might I tell?

Should I assume/hope/anticipate that any mapping check done would have picked up any required balance of throttle bodies...?

I will get my torch out and look for these vacuum pipes...where might I find them...what am I 'google' searching for....

Many thanks!!

 

chaps - both, thank you for your replies...

I feel suitably daunted by connecting cables to laptops - laptops being easily as scary as motorcycle repairs! But I'll investigate.

• Is the software idiot proof?
• what about these vacuum pipes - just that they are still flexible and not obviously split?

my feeling is, is that it is more at the grip end...but it is very slight...it just seems the difference between 'no throttle' and 'some throttle' is quite distinct - but it is merely that very first pick-up of zero to some.... almost like you can't open a hole up gradually...it is either shut or open...if that makes sense...

anyway, I'll investigate... Thanks y'all!

 

Thank you freck!

 

continued thanks for this, and the useful pic! I will certainly have a go at having a look...although, initially, I just see this...

 

I have - i think - resolved (partly) my sticky snatch!

I was investigating (from yet another thread I have about mirrors) the ease/pain of bar end mirrors. In doing so I took off the bar end on the throttle side, and looking in to the hole and twisting the throttle there was a reasonable amount of corrosion. It looks like in the gap between the bar end and grip there's been some water ingress as there was visible rust.

It looks to me that - and this is gonna get technical - there is a tube that rotates about another tube. And the corrosion was between the two.

A good clean and lube...and voila...I think my throttle is more responsive (or less responsive, but in a good, non snatchy way)....!