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Message started by gazab44 on 09/04/05 at 09:47:43

Title: Trouble Again!
Post by gazab44 on 09/04/05 at 09:47:43

Bike as been running ok for last couple of weeks until yeaterday...rode to work, 7 miles, and all ok.
On the way home it started backfiring more than normal, only little farts though.
This morning went for a run and still the same.
Rested by a river for about an hour and when I restarted it wouldn't even tick-over correctly...ended up pushing it about 4 miles home.
When I finally stopped sulking decided to have a look.
Plug was black and sooted but not wet.
NO new plug so cleaned it up.
Tried again but still wouldn't tick over.
Took plug out again and it was black and sooted, not wet, again.
Tested for spark...there was a spark but not where it should be..dancing all over....so obviously plug shot.
Could it be that it is set up so lean that it is eating away at the plug until finaly it gives up...
I also checked fuel system and it appears ok.

UK SPEC REMEMBER

MAIN 130
PILOT 47.5
SCREW 2 1/2

Title: Re: Trouble Again!
Post by torque on 09/04/05 at 10:18:08

i had the same problem yesterday,i took it for a ride,then when i came to a stop,it started to die,i had to rev hard to keep it running,but when i got on my street it died.tryed to start it but it would fire then shut off ,so today i took the carb off and took it apart, cleaned everything with carb cleaner,there was some dirt in it .
it seems to be running as usual,ill have to see if still runs good tomorow,i think there was some water in the gas too.the fuel float was out of spec too!

Title: Re: Trouble Again!
Post by threezukes on 09/04/05 at 16:13:48

I'm not an expert, but I thought that if the plug was black it meant that the engine is running rich and greyish white color means that it is lean.

update..
I'm running almost the same set up as gazab (130 main, stock air filter, free flowing muffler) and i just checked my plug and it was black and sooted too. Haven't had any starting problems yet, but recently my bike seems to be backfireing more the usual too. I'm gonna try maybe a 135 main...?

Title: Re: Trouble Again!
Post by gazab44 on 09/05/05 at 00:59:23

threezukes wrote:

I'm not an expert, but I thought that if the plug was black it meant that the engine is running rich and greyish white color means that it is lean.

That is my understanding also.
But I was thinking that if the plug was breaking down and not sparking correctly could it present the same symptoms...and eventualy flood.

Title: Re: Trouble Again!
Post by methom on 09/05/05 at 07:57:37

Any chance that you got some bad gas?

Title: Re: Trouble Again!
Post by slavy on 09/05/05 at 09:18:36

It seems to me, that You are having a pretty rich condition. First make sure The carb is not flooding. The main jet makes a diff if You are riding 3/4 to fulll trottle. The way You sound, You are "riding more on the needle"- around 1/2 trottle. In this case- You might have to lean slightly this area- drop the needle slightly down.

Title: Re: Trouble Again!
Post by threezukes on 09/05/05 at 17:31:05

With the stock 130 main, repositioned clip, and fuel mixture screw turned out, is it possible that the lower end is too rich making the plug black and the higher end is too lean causing the backfire?

Title: Re: Trouble Again!
Post by gazab44 on 09/06/05 at 00:59:23

slavy wrote:

Sorry slavvy what you mean by drop the needle..mine has 3 notches set back to the middle one at the moment.

Title: Re: Trouble Again!
Post by Dynobob on 09/06/05 at 15:43:38

gazab44 wrote:

Sorry slavvy what you mean by drop the needle..mine has 3 notches set back to the middle one at the moment.

If you raise the clip on the needle to the top slot, it will lower the needle making your midrange leaner.

Title: Re: Trouble Again!
Post by PAPA_THUMP on 09/06/05 at 16:44:21

;D ;D ;D

HI GAZAB44 --just a thought from left field__

try checking electrics-- ignitor, reg/rectifier--

sometimes a weak/eratic spark means foul up

sounds like fuel(sorry petrol) is ok ??? ???

papa thump

Title: Re: Trouble Again!
Post by Kropatchek on 09/07/05 at 02:45:17

PAPA_THUMP wrote:

Electrics:
Check the little wire from the negative of the battery.
There's a connector about 10 inches away from it. Disconnect - clean - reconnect.
Solved a lot of intermittend ignition problems in the past.

Greetz
Kropatchek ;D

Title: Re: Trouble Again!
Post by vroom1776 on 09/08/05 at 12:03:21

gazab44 wrote:

Tested for spark...there was a spark but not where it should be..dancing all over....so obviously plug shot.
Could it be that it is set up so lean that it is eating away at the plug until finaly it gives up...

Well, if it does give up, and I'm not sure if that will happen from a lean condition, it can end up looking rich as the gas gets sprayed on there. I think. :P

Is the plug gapped correctly?

Also, backfiring is a rich condition...

Title: Re: Trouble Again!
Post by gazab44 on 09/09/05 at 01:14:46

yes the plug was gapped correctly..
haven't had time to try all your suggestions yet..work you know...
but next week i'll buy a dozen plugs and work through them, one at a time.
Now missing riding :'(

Title: Re: Trouble Again!
Post by vroom1776 on 09/09/05 at 08:42:09

gazab44 wrote:

but next week i'll buy a dozen plugs and work through them, one at a time.

That is funny.

Sucks being bikeless... >:(

Title: Re: Trouble Again!
Post by gazab44 on 09/12/05 at 04:56:18

I don't know whether you can see from this photo but does this look like the slide has been rubbing..it does to me...this could cause it to stick...
if so, what should i use to clean it?
Should it be shiney or black?

http://homepage.ntlworld.com/gary.brooks2/Picture%20007.jpg

Title: Re: Trouble Again!
Post by Reelthing on 09/12/05 at 05:33:49

Some rubbing but not real bad - I cleaned the slide and bore with electric contact cleaner and a clean rag - and then started to add a bit (maybe 1 oz) of castrol tts 2-stroke oil every 2 or 3 tanks - about once a week - no more issues with the slide - when it would hang the bike would start to cut out below half throttle and pretty soon flood out.