Horizon Hobby HANGAR 9 Composite QQ Yak-54 2.6m Manuel D'utilisation page 66

coWl preparation For stock muFFler • • •
6
Use a copy machine and reduce the size to 87%.
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7
Using a hobby knife, cut the paper following the line.
8
Trace the reduced blister size on the cowl such that spark plug contact area
is inside the blister.