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Old 05-31-2012, 10:35 AM   #1
DW99 OP
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Montesa magneto..where to get one?

I may have just inherited a montesa trail...it seems in decent shape but my father inlaw (original owner) thinks it needs a new magneto....any idea where to get one?? I believe it is a '76/'77

thanks guys
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Old 05-31-2012, 11:42 AM   #2
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Quote:
Originally Posted by DW99 View Post
I may have just inherited a montesa trail...it seems in decent shape but my father inlaw (original owner) thinks it needs a new magneto....any idea where to get one?? I believe it is a '76/'77

thanks guys
Is it a Cota 348 Trail?, can you please give us the model name the serial number and type of ignition that is now installed, as there where two ignition brands that where mounted on Montesas (as I beleive to know):
Femsa and Motoplat

Mostly the points and the condensor / capacitator are the problem, I would first replace them together with a new plug, much easier and cheaper too!
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Old 05-31-2012, 11:58 AM   #3
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i will when i get the bike lol..it is hopefully being transported right now..to be honest i am not too sure what model it is..i will be back with more info soon...thank you for the advice
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Old 06-01-2012, 11:13 AM   #4
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ok so I have the bike now...and over all it actually looks like it is in decent shape...now i have to warn you all. I have little to no experience working on bikes etc. I have some help...and i am doing this kind of just for fun. If it is going to be a pain or cost too much then I will most likely just put it up for sale or drop it off at the junkyard lol.

so...we are not getting a spark...before jumping in and going right to the magneto I think we are going to start with a new plug and work our way back from there. however...we are thinking I may need a new coil.....and finding one may be the problem....I am including some pics....the spark plug wire has been melted pretty bad, not sure if that is causing the spark problems, as well when I pulled the rubber end off the spark plug wire it was pretty beat up inside etc.....so my questions are these....do you guys think the melted/frayed wire are a problem? which plug should I be getting to replace the old plug and does anyone know a place in north america to get a replacement coil...I am not looking to do a resto so it doesn''t have to be OEM if there is an after market brand that will work.

thanks so much for all your help. you are helping a new rider have some fun with an old bike.

hope the pics work...










sorry about the quality...just my iphone
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Old 06-01-2012, 06:47 PM   #5
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First off, get a new plug and a new zero ohm (3 or 5 ohm will do too)and check for spark. Do this by positioningthe lead on the bottom of the spark plugagainst or very close to some part of the engine. Please don't hold the spark plug or you will be shocked.

If you still have no spark,check to points and make sure they are opening. Depending on the type of mag you have this could be easy (internal rotor) or hard (external rotor).

If the points are not opening, gently use a chopsix or other sutiable wooden tool and only applying minimal pressue and open the points. Check for spark again.

If the points and capasitor are all cruded up, call or email the guys at Vintage Iron: http://www.vintageiron.com/ and order some points and capasitor.They will also be able to hook you up with a new coilif that is what you really need.

BTW, if you end up changing the points, make sure you wait until the new ones arrive before you do so, and take several before pictures, they re-assemble in more than one way. Also go to Sears and pick up a metric set of ignition wrenches, you are going to need a 5.5 mm.
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Old 06-01-2012, 07:01 PM   #6
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looks to me like a motoplat coil. you would have motoplat ignition. no points or condenser.

_OOPS - my bad - this may be points with early motoplat coil, not electronic. how many wires coming outta ignition?
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Old 06-01-2012, 11:44 PM   #7
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I have gotten a few bikes for practically nothing because people had no idea how to change/adjust points..or just didn't want to "mess with electrical stuff" ... pop the ignition side cover off and see if the points are opening or not ...lots of times they get froze together on old bikes.
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Old 06-02-2012, 05:53 AM   #8
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The coil looks good, beside that he has burned cable through the exhaust, very commen on trials machines of this age with center exhaust that goes above the cylinder, but no issue for the coil anf functionallity. You can wrap some insulation tape around as first step. To the end of the plug wire, cut of 5mm then all wires will show up again.

The Cota 348 which is the model from which your 348 Trail is made and will share at least 95% of the parts had a Motoplat, as you have a Motoplat coil there should be - as stated by stainlesscycle - a Motoplat ignition too.

As long as you don't have any better spec's you can take the spec's of the Cota 348 which should fit too, you find a part list a manual and all the offical spec's for maintaining and screwing around here:

http://www.mallorcamotorweb.com/manu...l_despiece.PDF

It's in english too!

A shoot-out / test between Bultaco Alpina and the 348 Trail:
http://www.motosclasicas.org/images/...pt_1979_01.jpg
http://www.motosclasicas.org/images/...pt_1979_11.jpg
http://www.motosclasicas.org/images/...pt_1979_12.jpg
http://www.motosclasicas.org/images/...pt_1979_13.jpg
http://www.motosclasicas.org/images/...pt_1979_14.jpg
http://www.motosclasicas.org/images/...pt_1979_15.jpg
http://www.motosclasicas.org/images/...pt_1979_16.jpg


The 348 Trail is as already stated a slightly modified Cota 348 with some minor changes, in 1979 Montesa already had a better trials machine developed, the Cota 349, the remainig parts of the older 348 where used for the trails model.

Get some tools for deassemble the rotor and ajusting the ignition, replace points and capacitator as these are the main units that can and will fail after 3 decades. This will save you money and a lot of time for getting the bike running. If you can't do it by yourself bring the bike to a shop and let them first do that.

Meanwhile you can clean up the carb, wash the air filter and reoil him, and replace the gear oil. It's good to to look up the wiring, clean the contacts (connections) of the wires loom too.

After the above treatment the bike should run, the 70's spanish bike are extremly durable, the only weak point is the ignition.

Anyway, nice found, get here slightly restored where needed, the Trail is really rare at least in Europe.
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Old 06-04-2012, 08:46 AM   #9
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anyone know if this is a 6V or 12V system? I am trying to order a new coil for it and the parts guy says he needs to know....he asked what my battery was..I said I do not have a battery lol....
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Old 06-04-2012, 09:32 AM   #10
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Be sure to get the right one, the coil should really fit! The burned cable is no Issue an very commen on these bikes!

Oh the answer ... it's 6V as I know.
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Old 06-04-2012, 10:39 AM   #11
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I am ordering this one, can anyone confirm this is the correct one?

http://www.motorcycle-superstore.com...T.ac=SLIsearch
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Old 06-04-2012, 11:10 AM   #12
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Originally Posted by DW99 View Post
I am ordering this one, can anyone confirm this is the correct one?

http://www.motorcycle-superstore.com...T.ac=SLIsearch

Not me I would take one from Motoplat or replace the ignition as a kit, mixing the system, often does not work proper in my experience with electricity so far, (But I try to avoid any electrical issues as good as possible).

Here is one, (but without lights):
http://www.electrexworld.co.uk/acatalog/STK-349.html

Or the far better unit from here, with light:
http://www.powerdynamo.biz/deu/syste...7190acmain.htm

For both it is necessary to call them up in first hand so you get the right system for your bike.
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Old 06-04-2012, 01:29 PM   #13
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ya i am not going to be ordering from europe for a free bike that isn't worth what i am already putting in to it lol..but thanks
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Old 06-04-2012, 01:39 PM   #14
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have you taken the ignition cover off to see if it is motoplat electronic, or points? if it is indeed points, any 6v coil will work. if it's motoplat electronic, you need the right coil. usually not too expensive...
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Old 06-04-2012, 03:37 PM   #15
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These old Montesas are not very common in the USA I believe. As this bike model isn't much known it's probably not so much worth where you live but elswhere like Europe and expecially in south west europe a good working red 348 or 349 is worth some money, here take a look:

http://www.francetrialclassic.com/fr...-exception?p=2
(OK this is the situation over the pond not yours)

I hope that when you got the bike running you will see how it will perform, it's very good for trails riding in the woods and will also outperform new enduro bikes when it comes to very thight and difficult terrain. The bike is actually more a trials bike then a trail bike but you will discover by yourself I think, It's also very good for mountain biking and doesn't like high speed anything below 50 km/h (35mph?) is comfortable.

As you got it for free I believe it is not such a bad idea to invest at least some money.
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