Cota 172 Restoration

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Phil 850
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Cota 172 Restoration

Postby Phil 850 » Mon Jan 25, 2016 8:37 am

Hi all
I have just bought a Montesa Cota 172 to restore as a casual ride bike and possibly some trials days.
The bike is currently blue.
What is the correct colour for the frame and tank.
Is there a spray can that matches the correct colour for the tank ?

Regards
Phil



Phil 850
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Re: Cota 172 Restoration

Postby Phil 850 » Mon Feb 08, 2016 9:41 pm

Just trying to start my :montesa 172.
It has a nice blue spark at the plug, but how do I set the carby for starting.
I can't find a Choke on the Amal 620/406 that is on it ?
Any hints would be appreciated.
Phil



David Lahey
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Re: Cota 172 Restoration

Postby David Lahey » Mon Feb 08, 2016 10:25 pm

I think that carby has a "tickler" which is a button that you press downwards until petrol squirts out a little hole under the button. The button holds the floats down which allows the fuel level in the bowl to go way above where it is for normal running. Don't hold the tickler down for too long or you will put too much petrol in the crankcase
On some bikes you have to tickle it a bit even after the motor starts, to keep it running until it gets a bit of warmth in the engine


relax, nothing is under control

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OKOAustralia
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Re: Cota 172 Restoration

Postby OKOAustralia » Tue Feb 09, 2016 8:38 am

Phil
We have inexpensive replacement round and flatslide carburettors that would improve the throttle response and overall rideability of the Mont..
Regards
Denis Lovett
07.3040.0231
www.oko-australia.com.au



Phil 850
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Re: Cota 172 Restoration

Postby Phil 850 » Tue Feb 09, 2016 9:34 pm

Thanks David
I used the "tickler", but to no avail.
Pulled the plug and it was dry but still had spark.
Tickled some more and had a sort of "kick back" but didn't actually fire.
Pulled the plug again and it was wet, so now at least it's getting fuel.
Tested the plug again and now there is no spark :(
It is a KLG FE80, possibly original so I will by a new plug or two (NGK B7ES & a B6ES) and see how one go them goes.
The plug lead is a bit fried, is there some way I can test it and the coil :?

Phil



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Re: Cota 172 Restoration

Postby David Lahey » Tue Feb 09, 2016 10:07 pm

Weak spark could be caused by many things.
Look for (in order of probability of being the cause):
sparkplug carbon fouled
points dirty/stuck open
condenser failed
broken/corroded LT wiring at the stator
poor earth for motor or HT coil
points wire shorting to earth somewhere (includes inside the killswitch)
loose connection in LT wiring
points set wrongly
loose stator coil screws
loose stator plate screws
failed stator coil winding
failed HT winding of HT coil
failed LT winding of HT coil
broken HT lead/plug cap
loose flywheel
sheared flywheel key
main bearings have so much play that points are not being opened
rust causing flywheel to touch stator

The coils can be tested using a multimeter to measure the resistance of the windings


relax, nothing is under control

Phil 850
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Re: Cota 172 Restoration

Postby Phil 850 » Wed Feb 10, 2016 8:08 pm

Thanks David
Fitted a new plug, tickled the carb, couple of kicks aaaaaannnnndddddd........ Vroooom :D



Phil 850
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Re: Cota 172 Restoration

Postby Phil 850 » Sun Feb 14, 2016 4:31 pm

I was looking at the forks and noticed that if I hold the front brake and rock the bike back and forth there is clearance and movement at the top of the lower fork leg.
I presume that the bush is worn and needs replacing.
Does anyone have a manual that describes what I need to do.
Where can I get the parts I need also.
Image

Regards
Phil



Phil 850
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Re: Cota 172 Restoration

Postby Phil 850 » Sun Jun 26, 2016 3:52 pm

I have an issue with my kick starter (well actually 2 issues).
The pin that goes through the lever has a groove in it and I presume there should be a detent ball in the lever.
Does anyone know how to fix this ?
Image

Also the kickstart shaft looks bent and damaged from the loose lever.
Is this a big job to replace and where are parts available from.
Image



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Re: Cota 172 Restoration

Postby David Lahey » Sun Jun 26, 2016 6:54 pm

I haven't worked on 123 forks, but 1970s forks don't usually have a replaceable bush. If the fork slider bearing surfaces are worn that much you could spend a lot of money having bushes fitted, or find some 123 sliders that are not worn out, or for the most economical option, fit some similar forks from a different (common) bike.
A possible reason for why the sliders are worn is what appears to be poor condition of the surface of the tubes
If they are 30mm diameter fork tubes, TY175 fork tubes should fit into the triple clamps


relax, nothing is under control

Phil 850
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Re: Cota 172 Restoration

Postby Phil 850 » Sun Jun 26, 2016 8:32 pm

Tanks David
I just measured the fork legs and they are 31.75mm (1-1/4").



David Lahey
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Re: Cota 172 Restoration

Postby David Lahey » Mon Jul 11, 2016 9:55 pm



relax, nothing is under control

Phil 850
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Re: Cota 172 Restoration

Postby Phil 850 » Thu Jul 14, 2016 9:36 pm

Thanks David
Unfortunately my fork legs measure 31.75mm so the ones on eBay would be a bit loose in the triple clamps :(



Phil 850
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Re: Cota 172 Restoration

Postby Phil 850 » Sat Oct 08, 2016 2:55 pm

I have stripped and cleaned out an old speedo drive but I don't understand how it attaches to the front wheel to drive the internal gear ?.
Any clues.

Phil



Phil 850
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Re: Cota 172 Restoration

Postby Phil 850 » Sat Oct 08, 2016 5:05 pm

I've discovered that there is a drive bracket missing from my speedo drive.
I think it should be screwed to these three holes on the worm gear.
Image
The bracket then fits into these slots in the front wheel hub.
Image




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