LCGB Forums

Hello peeps, can anyone suggest a remedy?
When i start the scooter with choke on it revs uncontrollably but as soon as i flip it off it immediately settles to a nice tickover.
Choke cable 'seems' to be seated ok.
When i return from riding i always turn the petrol off straight away but the scooter once stood reeks of petrol.
I can't see any petrol leaks.
Reed valve motor with 30 phbh delly, remote filter.

Any help appreciated!!
Super

Inspect the rubber adaptor that connects the carb to the manifold. These do split eventually and old ones can fail to seal under the jubilee clips. This would give increased revs under choke conditions and will lead to piston failure if not corrected. Sticky's manual has a chapter on this known issue I think?
If yours doesn't have the small aluminium spacer ring in the middle of the adaptor then I would recomend that you fit a new adaptor with this ring.
Also consider disconnecting your fuel pipe from the carb banjo and prove to yourself that the tap actually does turn off with no dripping.
It could be that the carb fuel bowl is overfilling or there is an issue with the choke jet, in which case a carb inspection and overhaul with a new float needle would be a good starting point.

Thank you much appreciated. I will have a look today.
Super

First off, thanks to f&f for the advice! Changed float needle and valve, changed manifold flange from MB to Readspeed one which seems a lot sturdier and is steel reinforced on the mounting hole section. Also it is about 5mm shorter in depth giving more panel clearance which is a bonus. Did other checks recommended and fired scoot up and still revving eratically on choke. It was late so left it to this morning. Started it up with choke and it was fine no over revving, but then scoot died. Re fired it up to reems of smoke, backfiring/ four stroking? Kept dieing. Them wouldn't start plug was wet/black. Now no spark so tried new plug ht cap still no spark. So angry I could pop a balloon ! Am I right in suspecting stator failure?

Super

Gotta love them, fix one issue then another 2 follow along

Yeah your right there, couple weeks ago went for test ride after working on scoot, looked down and the fekin toolbox door had fallen off!

With smoke and erratic behaviour, you may have a leak on the drive side oil seal........or you may not ?

Before you do anything else, remove the plug. Next, unscrew the cap & strip some insulation back to copper. Check the other end, though, where it screws into CDI. Check all earth connections (engine to frame etc) Pull any kill switch/key ignition wires to eliminate them.

Kick over with the HT lead only to see if you have a spark. If brave enough, 'feel' for anything.

What have you got?

Thanks all for taking the time to give advice! I'll have another look at the weekend.
Many thanks Super

Had a visit from knowledge we (ok he) took a look at scoot and found that the kytronic ignition box had failed. Bypassed and fires up perfect and choke works fine. May revert to static timing is 17° still OK for a ts1?

Cheers Super

superhooper wrote:May revert to static timing is 17° still OK for a ts1?

Cheers Super

17 is fine Roy

Colin

Cheers Colin, hope all is well with you!
Super

Another victory for Knowspeed.

Smug-mode.

Knowledge wrote:Another victory for Knowspeed.

Smug-mode.

'Practical' versus 'Theory'

Sometimes, the only way you can ensure suggestions are followed, to the letter, is by doing it in person.

Ignition issues are so prevalent with electronic systems, including the 'uprated' aftermarket set-ups, that they must be the main reason for failure.

Even if a spark is present, with electronic systems, there's no assurance that it will be @ the correct time! Unlike contact breakers......

However, worth mentioning (for other readers) that with plug out (but earthed) & the engine spun up via a good drill via the flywheel nut, a strobe will soon verify just how 'reliable' the ignition components are. I've seen wildly erratic timing via that process.

WT1 I like the idea of using points ignition but was the original reason riders went over to electronic ignition because at high revs points they don't work properly?

superhooper wrote:WT1 I like the idea of using points ignition but was the original reason riders went over to electronic ignition because at high revs points they don't work properly?

Innocenti fitted heavier sprung points to the GP to address points bounce, some like points but I've spent too many hours rolling about in the cold and wet cleaning and adjusting to bloody things. They require frequent maintenance/adjustment/replacement as do all classic cars still running with points.

Ha!

The only point (pun intended) I was trying to make (on this occasion ) is that points failure is not subject to erratic timing changes as components fail.

The quality of electronic systems & number of components means that failure can mean a lot more head scratching!

As an aside, some trivia. Long after he had introduced electronic lightweight Ducati Electronica systems, the instigator was still running his Group Six 'sit-up-&-beg' bike on total loss battery fed points. Good old Ray Neal. He probably spent money on flashy cardigans & jumpers, mind you.....

Roy’s ignition has been reset to 17degrees and all is good without the Kytronics box.

coaster wrote:

superhooper wrote:WT1 I like the idea of using points ignition but was the original reason riders went over to electronic ignition because at high revs points they don't work properly?

Innocenti fitted heavier sprung points to the GP to address points bounce, some like points but I've spent too many hours rolling about in the cold and wet cleaning and adjusting to bloody things. They require frequent maintenance/adjustment/replacement as do all classic cars still running with points.

I no longer like the idea of points ignition. Fickle, me?

superhooper wrote:

coaster wrote:

superhooper wrote:WT1 I like the idea of using points ignition but was the original reason riders went over to electronic ignition because at high revs points they don't work properly?

Innocenti fitted heavier sprung points to the GP to address points bounce, some like points but I've spent too many hours rolling about in the cold and wet cleaning and adjusting to bloody things. They require frequent maintenance/adjustment/replacement as do all classic cars still running with points.

I no longer like the idea of points ignition. Fickle, me?

I completely understand that, as why wouldn't you want to ensure the investment made in an electronic system should work?

However, anybody that expects reliability from the common-or-garden Indian produced kits are eluding themselves.

The greatest advantage to the electronic ignitions that I own & trust are the capability of adjusting the firing point. For that purpose, I am a convert, but my faith lies with Motoplat, PVL, Piaggio & Selettra (Malossi use Selettra) as well as first generation AFR.

I hope we've done this to death now! An all too common problem with an electronic ignition kit fooled you, like many others, into thinking there was a fuelling problem. No doubt, such an occurrence will happen again