December 28, 201312 yr hi peeps just got an aprilia 320 and wanted to change the gearbox oil, but looks as if there are 2 drain plugs on the bottom of the crankcase, any idea which one it is
December 28, 201312 yr You are correct for asking, one is the drain, the other is the de-dent with a spring for the shift drum. The bolt should be the drum, the hex should be the oil. Let`s see if someone else has an opinion..
December 28, 201312 yr Have a look here, lots of good info http://www.armstrong-trials.co.uk/HIROclutchgear.html
December 28, 201312 yr Author You are correct for asking, one is the drain, the other is the de-dent with a spring for the shift drum. The bolt should be the drum, the hex should be the oil. Let`s see if someone else has an opinion.. just my luck both are hex and worn so cant undo either one, looking at the engine diagrams it look's to me its the outer of the two will wait and see what else is said
December 28, 201312 yr Wait, I`ll dig for my manual. I want to say it`s the inside. If you pull the wrong one, it could mean a lot more work is in your future!
January 2, 201412 yr Author thank you lineaway, I had emailed Armstrong about it but had no reply back until today and like you said its the inner most plug There are two hex headed bolts on the underside of the engine on the left hand side as you sit on the bike. The oil drain is the inner of the two, but the outer is just the neutral detent cap, so it wouldn't be a disaster if you accidentally removed it. Don't over tighten the bolt - it is quite a short thread and I have seen many stripped ones! I havn't seen any with allen heads, so maybe yours have been changed? 'hope this helps cheers john Edited January 2, 201412 yr by mont315
January 3, 201412 yr If I remember right, at least on the Aprilia the detent bolt also holds a spring that can be sprung when the bolt is removed.
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