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Post by vinrouge on Mar 26, 2008 19:43:57 GMT
Hi,
How do you check to see if getting a spark.
Riding along scoot just cut out on me and then just would not start. Have now cleaned/replaced jets in the carb, tested fuel tap, made sure the fuel was flowing, etc but still wouldn't start
I'm now beginning to test the electrical bits. Got new plug, cap and lead but still wont start. Things are now starting to look expensive so I'd just like to check things as I go along
Rob
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Post by scootsmith on Mar 26, 2008 19:54:27 GMT
Remove the plug. Hold the end of the spark plug against the metal engine casing whilst kicking the engine over. Don't hold the metal part of the spark plug holder..BUZZ ;D. When you kick over the engine you should see and hear a spark. No sparky No worky. Or your points are out.  |
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Post by vinrouge on Mar 26, 2008 20:14:51 GMT
Do I leave it connect to the lead, sorry only joking ;D
thanks for the help
Rob
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Post by vinrouge on Mar 27, 2008 18:07:31 GMT
Spark plug generating spark when using kick start, see and hear several on each kick, could not pursuade the missus to hold it against her tongue (like we used to do to test a battery), but nothing new there then.
Good compression, despite my best attempts to fire it into life not even a flicker.
The plug however stayed completely dry, does this indicate there still something wrong with carb etc.
Rob
Just noticed there a fking big air bubble in the fuel pipe, yet I watched it flow down to the carb ok last night
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Post by fatwill on Mar 28, 2008 0:04:44 GMT
question is is the spark a good un ? and is it sparking at correct time ? youl be ammazed the differncane the gapping on tip can make on some engines as well
personaly id try a fresh spark plug and cap before you start ripping the bike to bits
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Post by tony on Mar 28, 2008 2:38:58 GMT
what colour is the spark? Ok this sounds wierd I know.. but a blue one-good..... yellow-not so
If its a yellow then it may be sparking outside but maybe not enough to give an explosion inside. What ignition system is it? Had you just filled up when it went wrong?
many questions....
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Post by jonnysnatchsniffer on Mar 28, 2008 19:11:29 GMT
and try and get hold of an unsuppressed plug cap aswell they are much better espesially on points ignition
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Post by vinrouge on Mar 28, 2008 19:48:56 GMT
Hi,
After posting last message, went out later to test the spark again in the dark. This time notice that the terminal nut had come off and was stuck in the cap, still sparking tho. Ordered new lead, cap and plug yesterday from Beedspeeds, been despatch so may get tomorrow.
Just been out and tested see and hear loads of sparks on each kick, (white/blue in colour)
Should add its a PK50 with Polini 112 kit and exhaust, standard carb. PK100XL frame, no points or battery (lights come on when using kickstart).
Always used to start first or second kick, from what I remember I had difficulty getting it to fireup that day(gave up and had to wait 20mins) but then it fired ok. Done about 6 miles, mostly at full throttle (about 40mph) when it just cut out no warning, still got 2 litres of petrol in tank.
Tonight plug still dry, but still got that big air bubble in fuel pipe. Dellorto 16.10f carb.
Will try new plug and lead before taking dismantling carb again
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Post by Juan on Mar 28, 2008 19:56:14 GMT
Classic air lock fella.  Whip off the fuel pipe and get the air out of it.I'd also strongly recommend uprating to a 16/16 at minimum and preferably a 19 or 20mm carb kit. |
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Post by vinrouge on Mar 29, 2008 13:28:38 GMT
Disconnected the carb and checked the jets etc, fuel flowed into carb once reconnected, still good compression lights come on when using kick start but still not a glimmer of firing.
Trying to fit new lead, cap and plug that arrived this morning but how do you remove the lead from CDI unit, brute force?
Rob
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Post by tony on Mar 29, 2008 13:31:38 GMT
it unscrews rob.. do this check... first of all make sure the white wire(earth from motor) is providing a good connection. Get a volt meter.. set to ohms.. Read red to white(pickup check) resistance should be around 110.. then check the green to white (source coil) this should read around 500.
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Post by vinrouge on Mar 29, 2008 13:40:52 GMT
Cheers Tony
Thanks again
Rob
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Post by tony on Mar 29, 2008 13:46:02 GMT
if its still no joy i'd be taking the top end off mate.
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Post by noggin66 on Mar 29, 2008 15:52:51 GMT
Change the coil.
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Post by tony on Mar 29, 2008 17:49:19 GMT
has he not done that?
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Post by vinrouge on Mar 29, 2008 18:37:43 GMT
Not yet will attempt to fit the new lead into existing cdi tomorrow and see how it goes. You mentions it screws Tony, where you meaning the lead into the cdi or something else. I've just got a cable with the cap at one end(plug) and nothing at other. I've got to get that end in the CDI. Got CDI off scoot in kitchen.
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Post by tony on Mar 30, 2008 0:04:58 GMT
the ht lead screws into the cdi.. if you look in the hole bit where the lead goes you'll see a screw thread inside.
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Post by vinrouge on Mar 30, 2008 18:00:22 GMT
New lead cap and plug installed, plug sparking away. However still no joy when fitted. Good compression, but when plug removed it's as dry and clean as when it went in. Will borrow volt meter from work tomorrow and check wires.
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Post by hank on Mar 30, 2008 20:24:22 GMT
well if the plugs dry after trying to kick it off, it still looks like fuel problem. you got rid of the air leak, what about the tank filler cap breather? try kicking it off with the cap off, you could always pour a little petrol down the spark plug hole and see if it starts. i had a similar problem with mine but it was just an air bubble in the fuel pipe.
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Post by tony on Mar 30, 2008 21:14:14 GMT
or its not drawing through for another reason..? Seals gone maybe..and its drawing loads of air in, instead? I'd be thinking strip it.
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