Thoughts please

[Flipfly]

I've just been for a most excellent zoom around, down to Brum to polish my wife's ring (fnarr fnarr) dropped into Benhams to giggle at the 1200 miles WC with a noisy flapper valve (seems to be an arse theme going on here ) and then back down the twisties home.

I recently did a short service (oil and filters) with the view of doing the valves and throttle balance in the next couple of weeks. The bike is great, but on the motorway once nice and warm there was a definite hesitation post 90, almost like the bike is holding back. Seems to accelerate fine and smooth, but the hesitation has me pondering the cause. I also noticed the engine was a bit noisier than usual.

So, would the valves/lack of throttle body sync cause the above. My gut feeling is yes, but I do trust the collectives opinion more than my own. Only in here mind, the majority of the rest of the tossers are a bunch of numpties

 

[Cook1e]

Fuel starvation? When did you last change the filter?

 

[flatdog]

As it's an 1150 then nothings wrong. just your imagination.

Probably shat itself at those revs anyway.

 

[Fanum]

Twin spark?

 

[Flipfly]

Yes Bill, it's a concern but then the bike is mainly very smooth. The coils look in in very c lean condition although I know this is no guarantee.
If it is those feckin things already I shall be mighty pissed off, this is my first twin spark and I've avoided for that exact reason.

The bike pulls well through the gears and when given a 'beasting' it is fine. Stuttering happened after accelerating from a prolonged stint of roadworks and only after she had accelerated cleanly to 90 (ish ocifer).

Still, at least my flapper valve isn't shonky

 

[Uncle Rob]

In the 8 years I've had my 1150 I've changed 3 coils with the last one failing after only 16000 miles and it was one of the later type and it was as new when it was removed,but my experience when mine failed was that the bike was lumpy on tick over and would not Rev cleanly when accelerated

 

[Flipfly]

In the 8 years I've had my 1150 I've changed 3 coils with the last one failing after only 16000 miles and it was one of the later type and it was as new when it was removed,but my experience when mine failed was that the bike was lumpy on tick over and would not Rev cleanly when accelerated

It's not that then because it revs cleanly and tickover is pretty good, just a tiny bit noisy (but not tappety).

I'll do the valves and balance, hopefully this will recover it back to its creamy smoothness.

 

[Comfy Old Boots]

Simples. Give it a ?beasting' every time all the time. Hth.

 

[Fanum]

It's not that then because it revs cleanly and tickover is pretty good, just a tiny bit noisy (but not tappety).

Don't rule it out....I've had several start to fail over the years and they seem to do it differently each time......different rev ranges (or on a constant throttle), different areas of the power curve etc.

Who's got a twin spark 1150 or early 12 nearby?
Swap coil packs, whack down the road and at least you'll have eliminated them for sure

My guess FWIW is you've got a fuel pipe in the tank that's ballooning out under the highest pressure/flow....

 

[Flipfly]

Don't rule it out....I've had several start to fail over the years and they seem to do it differently each time......different rev ranges (or on a constant throttle), different areas of the power curve etc.

Who's got a twin spark 1150 or early 12 nearby?
Swap coil packs, whack down the road and at least you'll have eliminated them for sure

My guess FWIW is you've got a fuel pipe in the tank that's ballooning out under the highest pressure/flow....

Feckin BMW stick coils are massively expensive compared to say a zx10 stick coils, they even look similar. Thought there was a guy on eBay selling the beru ones for 70 squid, but can't see them now

I wish someone could come up with a sensible alternative, never needed twin spark, the old single sparks worked fine!

I think I'll look at having the tank apart, replace the filter and pipe work throughout just to make sure it's 100%. For the sake of a few quid it'll be worth it.

I'll also conduct the disconnect test tomorrow and see if one of the stick coils has died.

Bastard complications! The mind feck is that the bike actually runs pretty well, I just know it's not quite right and if I'm on my Spain trip this year I do not want any hassle.

 

[Uncle Rob]

Flip I'm off to Ireland end of the month for 4 days,so if you haven't sorted the bike by the time I return I'll post mine up to you or you can come down to Leicester to try my coils

 

[Flipfly]

Flip I'm off to Ireland end of the month for 4 days,so if you haven't sorted the bike by the time I return I'll post mine up to you or you can come down to Leicester to try my coils

Thank you very much, I might just take you up on that

 

[Flipfly]

Just been out and when cold the stick coils are obviously working. I'll have to wait to take it for a run and check em when they are hot.

I'm still thinking valves and balance may get it back in the sweet spot.

 

[Canuck]

I seem to remember a thread on advrider when a guy used coils from a ford or something...I think his user name started with an H but it is just as likely not to have... thats just what my brain is spitting out at the moment!

FOund it... HERE

 

[Aidan1150]

I'd be inclined to do the simple stuff first Flip. A good thorough service including as Bill suggested the tank innards then see where you go from there. If the problem persists, then you can go after the coils.

All the best with it.

 

[Flipfly]

Having read about the issues of heat and stick coils, I'm in a mind to move mine to where the servo used to reside. Anyone got a knackered stick coil I can have to have a play with. I want to work on plug leads but don't want to mess up my good coil packs

 

[Fanum]

Having read about the issues of heat and stick coils, I'm in a mind to move mine to where the servo used to reside. Anyone got a knackered stick coil I can have to have a play with. I want to work on plug leads but don't want to mess up my good coil packs

PM me yer address fucknuts

Ive got several spares, not sure how good

I'll send you an injector as well and you can try that...old but reconditioned with new seals etc

 

[monkeyboy]

What was the weather like? Been pretty flippin windy lately and that certainly makes a difference to my old GSA. Having said that it's got a CE Baileys screen that's like a flippin barn door.

 

[Trullion]

If it isn't the stick coils (and I wouldn't know anything about them as mine is an 1100 and only needs one spark plug to make the petrol go bang..) lack of power at the top end could be a pressure hose in the tank on its way out. If the hoses are original they'll be getting on a bit now. Seems to be more of an issue in the States, where they've had ethanol in their fuel in higher percentages a lot longer than we have. It could also be a partially bunged up fuel filter or a dodgy pressure regulator. Then again, it's twin-spark so it'll probably be the stick coils...

 

[cele0001]

I have had issues with stick coils and I took them out completely. I used regular single spark wires and ran them from "regular coil" down to the central spark. Lower plugs are just sitting there. Bike runs fine.