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Oh that one!
Yeah it was 156mm.
He did it for NPK because of weight rules, apparently if he stayed with twins he needed to add 300lbs and Birdman 500lbs!
So a massive single running big boost he got to stay the same weight.
Change of oil won't be a bad thing.
Worth having a look at the linkage, there may be a bit of play somewhere.
The nylon bush insert can cause a bit of play when worn.