Steve
You've come to the right place I think.
Most important thinks to get right are Alignment of Front and rear sprockets, and Chain tension.
When aligning the sprockets, I tens to bolt the engine on, and nip it up. Using a straight edge against the sprocket, I will move the sprocket carrier on the axle until positioned. Then i will tighten it up, and re-check the alignment.
Once this is sorted the chain needs to be fitted: To do this I usually undo the engine to allow the chain to be fitted, then set the tension.
Ideally you want about 10mm movement, this is often down to personal preference, but too much and the chain is more likely to come off, and too tight and you will wear chains and sprockets, as well as place excess strain on the chain.
Always spin the axle with the chain fitted to check there are no tight spots.
ALWAYS apply plenty of chain Lube before running.
And keep an eye on sprocket wear, it could tell you your sprocket is not aligned.
I am not sure there is a tool for checking tension, there is a laser tool for checking alignment, but I find the edge of a ruler works fine.
As for the bolt behind the engine, I always set mine by hand first. Once the tension is sorted and the engine is bolted up tightly (I do mine up pretty tightly) I will roll the bolt up to the engine by hand till it touches, then wind it back a turn prior to nipping it up with a spanner.
It is always worth using a new chain with new sprockets, check the condiiton of the chain after each event (tight links could mean the chain is wearing or damaged and will lead to higher sprocket wear) Always clean the engine and sprockets after each event to ensure you can see their condition.
Hopefully this will see you right.
Best of luck
Paul H
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