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Re: AAC 16 AAC250 Drag Bike

PostPosted:Thu Oct 17, 2019 9:00 pm
by IanFeltell
very interesting....keep it up with the good work 8)

Re: AAC 16 AAC250 Drag Bike

PostPosted:Sun Nov 24, 2019 11:27 am
by shasta
Posted a video of the bike turning over for the first time. It has got the plugs out and the clutch dis-engaged but it's a start. Be attempting it again with the plugs in and if it spins over fast enough, I'll go for a start!
Video at https://youtu.be/E7LnnzPKNxk

Re: AAC 16 AAC250 Drag Bike

PostPosted:Mon Nov 25, 2019 9:54 am
by NitroWars
Very nice, you've done a good job there. Thanks for posting and I am looking forward to the next instalment and seeing the bike back on the track.

Re: AAC 16 AAC250 Drag Bike

PostPosted:Sat Dec 07, 2019 2:43 pm
by oily bike bloke
Thanks for posting info and the video. looking good.

Amazing what can be done in shed.............

Re: AAC 16 AAC250 Drag Bike

PostPosted:Tue Jan 07, 2020 10:11 pm
by shasta
First starter motor came to nowt! Even with 24 volts through it, would not turn the engines over. Borrowed a small hi-torque starter motor from a friend who took it off his small block Chevy. However after weeks making up an adaptor to fit my starter 'spider' and making a handle arrangement, it all came down to a big FA in the spinning the motor over department!! I can't risk putting 24 volts through his motor as he wants it back undamaged, so the hunt continues. Anyone got any big hi-torque starters around under a bench?

Re: AAC 16 AAC250 Drag Bike

PostPosted:Wed Jan 08, 2020 10:27 pm
by shasta
Now building a 6:1 reduction gearbox to fit on the current starter I have. This should obviously increase the torque 6 fold with a similar reduction in speed but it should only need to spin over a few turns to fire up!
Be back with the update in a few weeks!

Re: AAC 16 AAC250 Drag Bike

PostPosted:Sun Feb 09, 2020 5:56 pm
by shasta
The reduction gearbox I've been working on is nearly finished, just one spacer to make when all bolted up and some guards to go on to prevent any fingers getting lost!
Photos show the construction from the blank sprockets to the finished item. Sprockets and bearings from Simply Bearings, ali plate from Metal Supermarkets is Southampton all other bits out of scrap box.
Will be fitting unit to the starter motor and then it's fingers crossed again to see if it works to plan!

Re: AAC 16 AAC250 Drag Bike

PostPosted:Sat Feb 29, 2020 9:37 pm
by shasta
The gearbox is finally finished and fitted to the starter motor. As you are aware the motor had no problem spinning the motors over with the plugs out, but with them in it was another no-no. The photos show the finished article and the two video clips show what happened.
https://www.youtube.com/watch?v=dFQ8WiC4M3Q&t=60s
https://www.youtube.com/watch?v=vurtUsCvOIw

Re: AAC 16 AAC250 Drag Bike

PostPosted:Thu Mar 05, 2020 1:17 pm
by shasta
First attempt to start on Tuesday. New fuel in, battery connected, kill switch off, chokes on, spin over and.... bang; the new drive pin in the output sprocket breaks up. Guess being a hardened steel pin it was too brittle, so all apart again (getting quick at this!) and a 1/4 inch stainless steel pin goes it and ready for second attempt.
Spin over, the rear motor coughs and ... bang, the long starter handle snaps where it meets the starter motor. It was only thin walled steel tube, so off to the metal supermarket again, and 600 mm of 25 mm diameter solid aluminium bar awaits machining and fitting for the next attempt..............

Re: AAC 16 AAC250 Drag Bike

PostPosted:Fri Mar 27, 2020 10:25 am
by MrPlod
Nice work - the bike looks the business , all the hard work shows - I'm surprised you can get all that in your 'garden shed' - bit like a Tardis :) - regards Kev