Hi Troy

The production engine has the same o ring set up in the carb as the 160.
I now have the 170 running as sweet as honey and it is an improvment over the 160.

Now this may sound odd but what I did initally to get the 170 running good was to put a T/ piece
in the front tube, pump to crankcase line, and then add a one way valve on to the T, allowing the vacuum in the engine to bleed off but hold the pressure in the front housing.

Bingo, what a differant engine it was, soon as it started it sounded right, gave it a quick tune and could not fault it at all, great idle, good top end, and transition, it was beautiful, could not fault it on the test bench. had total of about 3 tanks go through on the bench.

Mounted the 170 in a model and flew last w/end, could not get through a full tank, dead sticked about 2/3 of a tank, had 3 flights with same result, fitted a header tank thinking that may be a problem.
Next day another 2 flights same result.

Sitting there looking at model and thought, wonder what happens if I take the T and check valve off, so I did and motor still ran great but now, no dead sticks.
Have had another 6 flights with out a problem except for the last when the plug blew. Can't fault it now.

Seems as if this engine needed a bit of help to get bedded in, what else could it have been.
Even the gauge readings are now close to what the 160's run

We here in Australia are awaiting 5 more 170 's to come in, in the next week or so, will get my hands on them and see what they do, was it just this engine or do the others need a bit of help as well?

Troy, do you have any contact details on Albert Glenn, the American Team manager,
if so I would like to get in touch with him asap.

Will Crossman
Australian Team Manager