Montesa 348 needs help!

[Zedxfarin]

I have just got my hands on a cota 348 and i'm trying to get it going. Its not sparking from the plug. If i pull the plug out and hold the lead from the igition coil to the frame it DUZ spark. After this i place the spark plug back and theres no spark from the spark plug!!

Whats up with this its agravating me for days. The thing sparks direct from the lead but wont spark, spark plugs AHAHAH
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[Blue_SV650S]

Have you tried a new spark plug???

Also 2-strokes tend to oil plugs up ... try 'cooking' the plug on a gas hob for a bit!!
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The purpose of life is to fight maturity.

[Wafer_Thin_Ham]

+1 for new plug.

Chances are it's half knackered and can't spark under compression.
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[Zedxfarin]

New NGK spark plug orderd & New NGK Resistor Cover.

I will let you know how i get on.
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[Blue_SV650S]

[Zedxfarin]

ok you asked for it Blue, It sparks direct from the red lead. But when i conect the plugs and caps theres nuthing.

https://i793.photobucket.com/albums/yy214/zedxfarin/DSC00336.jpg

Ok so what your looking at now is a erly to mid 70z twin Shock Montesa cota 348. I was laffing when you said i would be out again soon as i'v never had it running EVER! LOL

https://i793.photobucket.com/albums/yy214/zedxfarin/DSC00338.jpg

https://i793.photobucket.com/albums/yy214/zedxfarin/DSC00340.jpg

https://i793.photobucket.com/albums/yy214/zedxfarin/DSC00342-1.jpg

https://i793.photobucket.com/albums/yy214/zedxfarin/DSC00341.jpg

https://i793.photobucket.com/albums/yy214/zedxfarin/DSC00339.jpg
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[Blue_SV650S]

[Zedxfarin]

I ordered a new plug and NGK cap. I'll let you know how i get on.
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[Zedxfarin]

The new plug and cap arived today. Sadly still no joy.

When i got the bike i was told to get a new Wood Ruff jey for the fly wheel. But the thing sparks on the red lead so i never ordered one. Do you think a new Wood Ruff key would help?

https://i793.photobucket.com/albums/yy214/zedxfarin/DSC00362.jpg
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[Blue_SV650S]

The woodruff won't make it spark ... but it will make it spark at the right time

Basically if the woodruff key is missing, the flywheel MIGHT spin on the shaft, therefore putting the ignition timing out ... but that is all it will do ...

I don't see how i you are getting a spark from the lead that you won't get one from a new plug ... how 'strong' is the spark from the lead? What sort of distances will the spark travel and what colour is the spark?

A bit of vid would help here if you have the facilities
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The purpose of life is to fight maturity.

[Zedxfarin]

Ok so i went out to make a video for ya and now its not sparking from the red lead ether. I'v just taken a step backword. asny sugestions.
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[Blue_SV650S]

[Zedxfarin]

I was thinking of replacing the wiring. Were could i get new wires for such an old bike

Since getting the bike i have been looking for a wood ruff key for it. I contacted in motion but thay have been low in helping me to be honest.
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[finpos]

Sounds like the first thing you should do is check for continuity on the coil. You should be able to find the HT terminal (end of the red lead), the low tension terminal (probably the blue crimp connector on the back) and an earth. Get a meter and measure the resistance between all 3, you should get a reading on all of them (not open circuit). If that's ok you can try and find the actual values in the manual somewhere. Then try again with the cap on.

A woodruff key will not stop your flywheel from rattling around on your crank, it's only there to make sure it's aligned properly during assembly. After that, it's the interference fit of the flywheel on the tapered shaft that holds it in place. If that fails, THEN the forces of the flywheel act on the woodruff key and destroy both it and the slot it sits in. To fix the problem you can variously try a new bolt, lap the flywheel onto the crankshaft with grinding paste, stick it on with special loctite which is made for doing exactly that, or all three if you are paraniod.

f.

[Gazdaman]

Replace the HT lead. It's cheap and will rule out a major possibility.

Make sure the connections are good between the HT>coil and HT>Plug cap and Plug cap>Plug.

Once you've ruled those out you need to look at the coil and then whatever triggers the spark on the engine.

Gaz

[Zedxfarin]

I took the engine cover off today and reatached the kick start. The fly wheel is turning when the kick start gos down. There are 4 wires coming from the windings. 3 of them lead no ware and one leeds to a splitter that joins the Earth, Kill Swich and Igniton coil. All the conection between the wires are simply hand twisted together
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[Zedxfarin]

[Blue_SV650S]

[Zedxfarin]

Its not sprking just now but i will try that in 15min
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[Blue_SV650S]

[Zedxfarin]

Well i just tried wiring to the ignition coil directly. Sadly no spark i held the cable with my finger and got a small shock when kicking, I DO have a voltage meater but i dont know how to work it. I dried wiring directly to 3 difrent ignition coils i have.
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[Blue_SV650S]

[Zedxfarin]

here we are:

https://i793.photobucket.com/albums/yy214/zedxfarin/DSC00002.jpg

https://i793.photobucket.com/albums/yy214/zedxfarin/DSC00003.jpg
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.

[Blue_SV650S]

Ok I have done some googling (trying to find wiring diagram) ... seems it might be a 'points ignition' ... can you see the points?

I bet they are closed up with a tiny gap or lots of corrosion ... hence the dwell angle is too short or it is not earthing out properly!

Oh and have a gander at this .... https://www.yankeetwin.com/motoplat.html
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The purpose of life is to fight maturity.

[Zedxfarin]

Yes its a point systam. I have a nuther set of windings from a nuther 348 i have. I took it out today and gave it a bit of a clean.

I'm going to:

Take the mageto out.

Change over the windings.

Replace the mageto and wood ruff key.

rewire the new black cable direct to the coil.

is there any dangers in any of that??

I dont wont to brake anything.

Also on the BASIC MOTOPLAT TESTING doc you posted it say the blue wire should run to a capacitor charge {large terminal} and kill switch. Currently it runs no ware will this stop the bike running?
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Montesa Cota 350cc, Yamaha DTr 125cc, Yamaha Timberwolf 250cc, Yamaha YZ 250cc, Kawaski kmx 125cc, Kawaski kmx 200cc, Yamaha TY80cc, 175cc Chinese Dirt Bike, Chinese Wanyge 125cc, Mini & Midi Moto 50cc - What i have owned.