Tak­ing a leak­down

Practical Sportsbikes (UK) - - Bikes of Your Life -

I’m not in the Face­book group but I couldn’t help notic­ing John Camp­bell’s plea in the last month’s let­ters about his Suzuki X1 and his re­quest for tips to get it run­ning .

He says he’s never worked on a two-stroke be­fore. He’ll en­joy it and find it easy and re­ward­ing once he’s grasped the fun­da­men­tals of the loop scav­enge sys­tem. It’s all about main­tain­ing crankcase pres­sure. So make sure there are no leaks in ei­ther the in­take or ex­haust sys­tem, fit new crankcase seals re­gard­less of how the orig­i­nals look, and per­form a leak­down test on the en­gine once it’s built.

Block off both in­let and ex­haust with air­tight plugs and then pres­sur­ize to 8psi. The en­gine should show NO loss of pres­sure for at least 10 min­utes. With that achieved, he will then have an ef­fi­cient, lon­glast­ing en­gine op­er­at­ing at peak per­for­mance. Then he can en­joy his 32mph flat out to the max­i­mum. On the plus side he’ll have a lot of fun when he’s der­e­stricted it. John Burgess, Wolver­hamp­ton

X1 in fine fet­tle fairly fly­ing along

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