PROJECT BIKE Lit­tle SDR will soon be smok­ing again

Motorcycle News (UK) - - News -

This lit­tle bike is my SDR200. If it’s un­fa­mil­iar to you then you’re not alone. It’s not a very well-known model be­cause Yamaha only pro­duced them for one year dur­ing 1987, and even then they were for the Ja­panese mar­ket only. A unique de­sign, the chrome trel­lis neatly houses a 200cc power valved, sin­gle-cylin­der two-stroke en­gine, and ev­ery­thing about it is just dinky.

I came across it while brows­ing the bikes at Ex­treme Im­ports near Nor­wich and it piqued my in­ter­ested be­cause I’d never rid­den one be­fore. As I was look­ing for a new project to keep me oc­cu­pied, I snapped it up for £1400. The bike was sold to me as a non-run­ner with the en­gine in bits and in need of at­ten­tion, so I have a fair bit of work ahead of me.

My first job is to find out what parts are still avail­able, as the en­gine needs to be re­con­di­tioned. In or­der to do this I’ll need some main end bear­ings, a new pis­ton, and also get the crank re­built and the cylin­der re­bored.

A close in­spec­tion of the crankcases has re­vealed dam­age and, as I’ve been un­able to track down any re­place­ments, I’ve de­cided I’m go­ing to get them re­paired – and ace spe­cial builder and top man Allen Mill­yard reck­ons he can help. So I’ve packed off the cases and posted them down to Allen for him to take a look at.

Lo­cat­ing some of the en­gine parts has ne­ces­si­tated us­ing some pat­tern bear­ings, while gas­kets and seals have been sourced from other mod­els with sim­i­lar en­gine ar­chi­tec­ture. Bikes like the early Yamaha TZR125, DT200R, and Yamaha Blaster all seem to have shared var­i­ous bits at some point.

As for the chas­sis, I’ll strip it down and give all of the parts a close in­spec­tion and some TLC which will in­volve get­ting some bits re­fin­ished by pow­der coat­ing and paint­ing.

My goal is to have a tidy-look­ing SDR200 by July, but I’ve got to rein my­self in and en­sure I don’t get car­ried away mak­ing ev­ery­thing con­cours. This isn’t a nut-and-bolt restora­tion but a re­built bike that I won’t be scared to use. I want to spend my sum­mer en­joy­ing this unique lit­tle Yamaha on my favourite roads.

Only pro­duced for one year and never sold here but Dunn’s try­ing to get his run­ning ‘I want to spend my sum­mer en­joy­ing this unique lit­tle Yamaha’

1987 YAMAHA SDR200

Trel­lis frame but it’s no Ducati. The SDR should end up look­ing the bike, top right!

Bruce snapped up the SDR as a non-run­ner but has the know-how

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