POS cb125 bucket

**wbks** · 8th February 2009, 21:49

Do idle settings effect the way the bike runs? It was brought up in another thread ages ago about equilizing revs and had something to do with that and I noticed most race bikes have very high idle speeds so I was wondering if that's something to do or have it idling low or what?

**Ixion** · 8th February 2009, 21:53

Not in a racing context. race bikes usually have high idle speeds because of cam and exhaust effects which mean they don't run smoothly at low speeds. Or carburettors like the Amal GP. Which had NO pilot circuit at all !

But temperature will affect carb settings all the way up the scale. Usually, makes it leaner.

**jonbuoy** · 9th February 2009, 04:45

Originally Posted by wbks

Do idle settings effect the way the bike runs? It was brought up in another thread ages ago about equilizing revs and had something to do with that and I noticed most race bikes have very high idle speeds so I was wondering if that's something to do or have it idling low or what?

A slight difference in idle speeds on multi cylinder engines makes a big difference in vibes and smoothness all the way through the rev range. Idle mix not so much once off idle - will have some effect but if you are running lean/rich at WOT it won't make a gnats difference. Maybe racebikes high idle is something to do with fierce cam overlap or a lack of idle jets in older bikes??

**piston broke** · 9th February 2009, 09:58

to continue with my a 100 problem.
i seem to have plenty of power at the ht lead,or at least i have had a good shock off it.
i have tried 2 different plug caps,if i put a wire into the cap i get a light spark when earthed to the engine.but no spark at all from a plug,tried 4 of them,one being new.

**Pumba** · 9th February 2009, 11:05

Originally Posted by piston broke

to continue with my a 100 problem.
i seem to have plenty of power at the ht lead,or at least i have had a good shock off it.
i have tried 2 different plug caps,if i put a wire into the cap i get a light spark when earthed to the engine.but no spark at all from a plug,tried 4 of them,one being new.

Might be worth a new thread rather than hiding it this long one

**Ixion** · 9th February 2009, 11:16

A light spark might not jump a plug gap especially if the plug is a resistor type.

Try removing the plug cap , bare the wire a little (hopefully you have a little to spare) and twist it directly to the plug. No spark, either dud plug, or weak magneto.

**piston broke** · 9th February 2009, 12:12

Originally Posted by Ixion

A light spark might not jump a plug gap especially if the plug is a resistor type.

Try removing the plug cap , bare the wire a little (hopefully you have a little to spare) and twist it directly to the plug. No spark, either dud plug, or weak magneto.

yep i tried the plug's direct to the ht lead,no spark,but i made the mistake of touching the top of the plug,received a wicked shock up one arm and down the other that was touching the kickstart.

**Sketchy_Racer** · 9th February 2009, 18:15

Originally Posted by jonbuoy

...snip.... Maybe racebikes high idle is something to do with fierce cam overlap or a lack of idle jets in older bikes??

With older bikes (as in bikes before the time of slipper clutches) I think the biggest reason they wind the idle up is to help stop compression locking coming down the gearbox. That is the reason I run the idle high on my GSXR600

**wbks** · 9th February 2009, 18:19

Thought it might be something like that. Will be something for me to try if my cb starts sliding the back in the wet while downshifting.

**koba** · 10th February 2009, 17:32

Originally Posted by piston broke

yep i tried the plug's direct to the ht lead,no spark,but i made the mistake of touching the top of the plug,received a wicked shock up one arm and down the other that was touching the kickstart.

Yeah, Start a new thread.

**piston broke** · 10th February 2009, 20:11

its all sorted folks.

thanks.
i managed to fit a bit of wet and dry paper into the points, i can't get the flywheel off as it's threaded.i got the paper in there through a little gap,a little sand and she fired first kick.

lol, i gotta remember how to kick over a bike again,just escaped a really wild kick back.

so i'll be at mt welli so you can all give me the learn next month.

thanks again.

**wbks** · 10th February 2009, 20:14

Is it going to be your first time as well?

... That off topic but I think you know what I mean lmao

**piston broke** · 10th February 2009, 20:23

yep.

will see you there then eh.

now we both have our bikes sorted.

so

how do i sort out a race number?

**wbks** · 10th February 2009, 20:35

Not sure, but It'll either be given to you when you register or just use what ever someone isn't running is my guess but I don't know either. My bikes not quite sorted yet, i still want to get an air filter for it and get it nyloned up. And the carb cap is held on by a ziptie because the thread is gone on the lid but that should pass.