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Montesa Cota 200 Restoration - Rebore And Piston Kit?


hab5000
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Hi all, I'm in the process of restoring a Cota 200, starting first with splitting the crankcase to replace main bearings. After removal of cylinder head & barrel, I've noticed there's some light scoring on the bore and piston skirts.

Anyone know the best place to get a rebore/piston kit done in the UK?

Much appreciated!

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Hi Hab5000,

Currently undertaking something similar with my 200 Cota, inmotion trials are very helpful, as are Southwest montesa in the US, there are a few French sites also worth looking at.

Hope this helps, and good luck with the rebuild!!

Cheers,

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I'm just finishing an MH200 restoration but got away without reboring... but if you are anywhere near Derby I have the contact of a very good specialist in Borrowash where you can wait and watch the process being carried out. In box me for the number.

Inmotion don't list a 200 piston but if you call them I'm sure they could point you in the right direction. http://www.inmotiontrials.com/product-category/engine-parts-montesa/

These are the before and after pics of the bike to date..http://www.flickr.com/photos/106795187@N06/sets/72157640687453394/

Edited by westyfield7
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Cheers! I'll have a look. How far on are you with the resto?

I managed to get an owners handbook on ebay, let me know if you want a pdf copy of the exploded parts list.

Will try and upload a pic shortly, thank you for the offer of the PDF, managed to get hold of one when I purchased the bike last year.

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  • 7 years later...
On 2/19/2014 at 3:28 PM, westyfield7 said:

I'm just finishing an MH200 restoration but got away without reboring... but if you are anywhere near Derby I have the contact of a very good specialist in Borrowash where you can wait and watch the process being carried out. In box me for the number.

Inmotion don't list a 200 piston but if you call them I'm sure they could point you in the right direction. http://www.inmotiontrials.com/product-category/engine-parts-montesa/

These are the before and after pics of the bike to date..http://www.flickr.com/photos/106795187@N06/sets/72157640687453394/

Hi,

Can you tell me the paint code you used on the frame?

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Hi ,, I have a cota 200 stached in the back ,,  cota 200 pistons are very hard to come by , , southwest montesa , looks to be closed , as of  7/ 19 , due to health reasons no longer selling montesa parts , he left this message , on his  web page , I. Called him few years ago , , very helpful , , upon info and ordering parts ,  SO ,,   if you find a piston for a 200 cota  it’s rare , there cycleservent in Oregon , states , he has a few cylinders for 200 , ,  ,,' I working on my bultaco pomeroy replica , 360  assembling a engine , I purchased on ebay  eng & frame match ,  cheers   ,, ps ,, just rember ,  there was a chap eastern central  England , that was selling used montesa parts, on ebay , , I don’t rember his name Like , it was about 7 years  ago I ordered part from him ,  on ebay ,,he had lots montesa used parts ,, you might call around bike dealers , repair shops to locate him he had a few 200 cotas was parting out  ,, really , 

Edited by larry s. k.
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7 hours ago, larry s. k. said:

Hi ,, I have a cota 200 stached in the back ,,  cota 200 pistons are very hard to come by , , southwest montesa , looks to be closed , as of  7/ 19 , due to health reasons no longer selling montesa parts , he left this message , on his  web page , I. Called him few years ago , , very helpful , , upon info and ordering parts ,  SO ,,   if you find a piston for a 200 cota  it’s rare , there cycleservent in Oregon , states , he has a few cylinders for 200 , ,  ,,' I working on my bultaco pomeroy replica , 360  assembling a engine , I purchased on ebay  eng & frame match ,  cheers   ,, ps ,, just rember ,  there was a chap eastern central  England , that was selling used montesa parts, on ebay , , I don’t rember his name Like , it was about 7 years  ago I ordered part from him ,  on ebay ,,he had lots montesa used parts ,, you might call around bike dealers , repair shops to locate him he had a few 200 cotas was parting out  ,, really , 

Larry can you measure up the important dimensions of your Cota 200 piston to help with finding something suitable.

Pin centre to edge of crown

Pin diameter

Width between pin bosses

Length of rear skirt

Nominal diameter

Ring location pin locations

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Hi  feetupfun ,, my cota engine is together , already assembled , , so what I rember 200 cota is really 175 cc ,  and has same crank wrist pin of 125 , it’s a small wrist pin , I have ventured  into looking into installing other brand pistons into different bike ,, close , not same usually different wrist pin & Bering , // #&% ,,,  have seen on internet ,  if my memory , correct , some one installed a Vespa piston  into a cota 200 ,  with a little matching, top of piston , for deck height  , this was years ago , I believe he  had it bored to ,,, , now ,  you have to research all Vespa for the Wright ,, proper wrist pin size ,, , 1 ,, then hope to match deck height , ,, I heard years ago the were going to mf more pistons for cota 200 ,, ya well there not enough bikes out there for them to make a profit  ,, I suppose ,  if  you watch ebay check once and while a 200 piston comes up ,  I know the the Oregon dealer. Had one 20 over , just this last few years for sale   And sold it  , so there out there ,  so  France trial classic , is selling upon waiting delivery Tarabusi brand piston 63.95mm  for E 177.00  you can put your email in for the waiting list  , cheers info from larry 

Edited by larry s. k.
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