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I bought a dear friend's 74 mk2 after he lost his battle with cancer last year. It had not been touched since 1983. It was in rough shape but i figured it would be a nice project for my 18 year old son and i over the winter. We did not take the engine apart but we did disassemble and clean the carbs (along with many other fixes etc to the bike). To our great joy it fired up and we put it on the road in late april. We put approx 300 miles on it staying close to home and it ran fine until i went for a ride last night. Rough running and low power. RH muffler was cooler than LH. RH spark plug was black, LH was tan. I cleaned the RH plug but no improvement. I ran it up to 3000+ rpm while riding in 1st and no improvement. I parked it and started surfing here for info. I found this thread with the same problem but it ends without a result. We'll start checking into it but if anyone has found a solution please pass it on.

<blockquote data-quote="Saber" data-source="post: 422624" data-attributes="member: 10051"><p>I bought a dear friend&#039;s 74 mk2 after he lost his battle with cancer last year.&nbsp; It had not been touched since 1983.&nbsp; It was in rough shape but i figured it would be a nice project for my 18 year old son and i over the winter.&nbsp; We did not take the engine apart but we did disassemble and clean the carbs (along with many other fixes etc to the bike).&nbsp; To our great joy it fired up and we put it on the road in late april.&nbsp; We put approx 300 miles on it staying close to home and it ran fine until i went for a ride last night.&nbsp; Rough running and low power.&nbsp; RH muffler was cooler than LH.&nbsp; RH spark plug was black, LH was tan.&nbsp; I cleaned the RH plug but no improvement.&nbsp; I ran it up to 3000+ rpm while riding in 1st and no improvement.&nbsp; I parked it and started surfing here for info.&nbsp; I found this thread with the same problem but it ends without a result.&nbsp; We&#039;ll start checking into it but if anyone has found a solution please pass it on.</p></blockquote><p></p>

[QUOTE="Saber, post: 422624, member: 10051"] I bought a dear friend's 74 mk2 after he lost his battle with cancer last year. It had not been touched since 1983. It was in rough shape but i figured it would be a nice project for my 18 year old son and i over the winter. We did not take the engine apart but we did disassemble and clean the carbs (along with many other fixes etc to the bike). To our great joy it fired up and we put it on the road in late april. We put approx 300 miles on it staying close to home and it ran fine until i went for a ride last night. Rough running and low power. RH muffler was cooler than LH. RH spark plug was black, LH was tan. I cleaned the RH plug but no improvement. I ran it up to 3000+ rpm while riding in 1st and no improvement. I parked it and started surfing here for info. I found this thread with the same problem but it ends without a result. We'll start checking into it but if anyone has found a solution please pass it on. [/QUOTE]

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