Flaky idle, misfiring, and dash resetting

Spoonbender · Post by **Spoonbender** » Sat Apr 30, 2011 10:10 pm

Hey lads,

Ignoring the fact that I just finished my successful 1000 mile journey from the wild east to London, there still are some problems which bother me quite a lot.

When it heats up properly after a long ride, and I happen to stop on a red light, the engine tends to shut down while idling. While it's an annoyance by itself, this shut down also manages to reset the trips and the clock on the dash -- and that kind of worries me.

I do believe the carbs need cleening and synchronizing, but why the hell does it reset the dash! They do not reset when I shut down the ignition myself! May a weak battery be the cause of that?

P.S. anyone round-ish London know a good place to take care of the carbs or could hold my hand and help me do it myself? I'm not local, so any help appreciated.

rob's red storm · Post by **rob's red storm** » Sat Apr 30, 2011 10:18 pm

Check battery connections and state of battery if its resetting, plenty of peeps round the London area where abouts?

benny hedges · Post by **benny hedges** » Sat Apr 30, 2011 10:20 pm

i take it you still have the original unfinned regulator / rectifier?
have a feel / peep under the right tailpiece about 1/3 back.... look for a small 2"x3" black box with a plug.... replace it for a finned one for a cbr125 off ebay.... about Â£20

could also be that whats causing it to stall but also check the condition of the air filter.

Kev L · Post by **Kev L** » Sat Apr 30, 2011 10:29 pm

I think spoonbender has a facelift model Benny, so reg/rec should be ok as standard, shouldn't it?

benny hedges · Post by **benny hedges** » Sat Apr 30, 2011 10:38 pm

Kev L wrote:I think spoonbender has a facelift model Benny, so reg/rec should be ok as standard, shouldn't it?

yeh m8 the later one should have a finned r/r but they can still fail.
sounds like it to me tho.

Spoonbender · Post by **Spoonbender** » Sat Apr 30, 2011 10:43 pm

rob's red storm wrote:Check battery connections and state of battery if its resetting, plenty of peeps round the London area where abouts?

The state of the battery is, in my opinion, bad. As far as I know, it was left untouched throughout the winter and it drained itself, was charged later on, but I'm very tempted to buy a new one.
I'm in Wimbledon, but I can drive around, of course.

benny hedges wrote:yeh m8 the later one should have a finned r/r but they can still fail.
sounds like it to me tho.

Is there any kind of diagnostics to determine if it is the rectifier that is faulty?

benny hedges · Post by **benny hedges** » Sat Apr 30, 2011 11:22 pm

just chuck the old battery in a bush,,,, the wombles will make good use of it.

theres a faultfinding procedure for the r/r in the pdf manual in the workshop section.
easy to do, basically just check to voltage at tickover - should be over 14v

the battery is an expendable item though...

benny hedges · Post by **benny hedges** » Sat Apr 30, 2011 11:22 pm

just chuck the old battery in a bush,,,, the wombles will make good use of it.

theres a faultfinding procedure for the r/r in the pdf manual in the workshop section.
easy to do, basically just check to voltage at tickover - should be over 14v

the battery is an expendable item though...

tony.mon · Post by **tony.mon** » Sun May 01, 2011 8:18 am

It's hard to see how the dash resetting is also affecting this problem.
If it was just stalling at tickover, that's a classic "carb balance/turn up the tickover a bit" solution.

BTW, tickover needs to be a little higher with these bikes, 13-1400 will do.

But as the dash is also resetting I'd suspect a wiring fault somewhere, earthing out and dropping voltage to not only the clocks but ignition.

Good luck finding that, though....

Have you got an alarm/immobiliser fitted?

Spoonbender · Post by **Spoonbender** » Sun May 01, 2011 1:36 pm

tony.mon wrote:It's hard to see how the dash resetting is also affecting this problem.
If it was just stalling at tickover, that's a classic "carb balance/turn up the tickover a bit" solution.

BTW, tickover needs to be a little higher with these bikes, 13-1400 will do.

But as the dash is also resetting I'd suspect a wiring fault somewhere, earthing out and dropping voltage to not only the clocks but ignition.

Good luck finding that, though....

Have you got an alarm/immobiliser fitted?

No custom alarms / immobilisers. And the dash was never reset while riding, or when turning off the ignition properly.
Right now I'm willing to blame the weak battery.

AMCQ46 · Post by **AMCQ46** » Sun May 01, 2011 6:38 pm

have a look at this thread http://www.vtr1000.org/phpBB3/viewtopic ... 66&start=0

Spoonbender · Post by **Spoonbender** » Wed May 04, 2011 12:21 pm

Ok, checked the R/R, it's good. Idle battery voltage is ~13.8ish2, which is, as far as I understand, also good.

That said, where do I sync the carbs in London? Any recommendations?

Spoonbender · Post by **Spoonbender** » Wed May 04, 2011 12:48 pm

FirestormMike wrote:Outside Buckingham palace, at 2am.

lloydie · Post by **lloydie** » Wed May 04, 2011 12:58 pm

FirestormMike wrote:
Spoonbender wrote:That said, where do I sync the carbs in London? Any recommendations?
Outside Buckingham palace, at 2am.

+1

tinysmall · Post by **tinysmall** » Wed May 04, 2011 4:43 pm

Can do it at my place. I live in Kingston and have everything you need. Literally 10 minutes away from wimbledon by bike.

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