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Post by skuttadawg on Mar 21, 2013 1:12:48 GMT -5
I used a glass bead blaster in auto repair shop and it makes aluminum look like its just be casted . Soda blasting is less abrassive too . Sand would eat it up
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Post by motts on Mar 21, 2013 7:37:13 GMT -5
Don't worry about measuring the rings. Just measure the piston and get the rings that go with it on the chart.
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Post by timmo1 on Mar 25, 2013 17:01:14 GMT -5
Thanks for this  I'm currently drawing up the piston etc in a 3D program so I know what the various measurements are and can send an detailed image with enquiries from parts suppliers. I have seen needle bearing kits which take up the extra slack to convert between a 12mm and 10mm wrist pin so that isn't a huge issue. My plan of attack for now (since I haven't been able to find a direct replacement piston) is to order some compatible rings, reassemble the engine and check compression/get it started with the current piston which I've cleaned up. |
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Post by timmo1 on Mar 25, 2013 17:05:37 GMT -5
Great scooter trike! I would not try and sand the piston yourself. I would take it to an automotive machine shop and ask them if they can fix it up for you, perhaps a motorcycle shop with a good sized shop might be able to help you as well. I know you probably want to keep it all original but have you thought about putting a newer power plant in it? I've gently sanded the piston already with a very fine grit as the alloy is very soft....it still has some ridges etc but they are no higher than the orientation arrow in the original casting. I have thought about a new engine although I really don't want to go down this route if possible. The other issue is, I've yet to find an engine which has the output shaft to the variator on the right hand side of the engine like this Daihatsu has, although I'm welcome to any suggestions in that regard. |
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Post by timmo1 on Mar 25, 2013 17:06:35 GMT -5
Don't worry about measuring the rings. Just measure the piston and get the rings that go with it on the chart. If it was a standard engine I would agree....but these are a bit different as they are quite deep. |
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Post by JR on Mar 25, 2013 17:28:46 GMT -5
If you go with a new motor, a jack shaft can be installed to bring the power to the correct side.
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Post by imnts2 on Mar 25, 2013 18:16:10 GMT -5
Welcome to our world. I sill hope to visit yours before I die. Always been one of my dreams (along with something about Marilyn)
But that piston is not your biggest problem, Tell me about the cylinder. Have a good auto machine shop measure it and examine it carefully. Also you need the crankshaft and con rod measured and checked too. I'll bit is t is old 2T technology with 1:25 oil/fuel ratio spewing a nice generous blue smoke tail.
I would stop and regroup before I put any money out. This is a 40 year old 50 cc 2 stroke machine, You are taking about under 5 hp pulling a 3 wheeler. I probably uses either a mechanical clutch and 2 or 3 gears or a centrifugal clutch and fixed gearing all of which is highly suspect.. At best it is a 23-30mph machine. Only 2000 were build because it performed very poorly and were not much fun. It also probably did not last well. Think about it. The busted ring may be telling you far more that you are hearing.
Sorry to rain on your parade. I suspect its highest value it not fun transportation
If you are still determined to rebuild that engine, I would get to work and try to find a mechanic in Vietnam to ship it to and let him make the parts and rebuild it right. Be cheapest. Put in a little overtime and hire a pro.
Cheers
lefty2
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Post by timmo1 on Mar 26, 2013 16:59:41 GMT -5
Thanks for your input imnts2 I'm under no illusions that getting this running again will result in a daily rider, nor anything fast, I bought it simply as a cool project and as something to get me off the computer in the evenings since I spend all day on one already  It definitely fits into the '2 smoke' category from what I've seen of videos of them running and I certainly agree that the weight + old engine + old bearings etc etc will not make it anything close to fast. But one thing it IS, is cool...and rare and I'd like to try and get it close to its former glory, commercial non-success of this model aside (which IMHO, was due to pricing and product placement within Daihatsu dealerships rather than motorcycle dealers rather than any inherent faults in the product). The only money I've spent on it so far is for rust killer, sand paper and some paint and I'll be doing all the work myself so if things don't work out it's no biggy- I would still have learnt a lot. Sending the engine overseas would be a) expensive and b) they would run into the same issues as me in trying to find parts I think (although I'd be interested to hear about custom parts manufacture there if anyone has details/ Costs etc). |
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Post by JR on Mar 26, 2013 19:17:25 GMT -5
Surely the comment about hiring a mechanic in Vietnam was not serious. I have heard horror stories about "restored" Vespas that people have purchased out of there.
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Post by skuttadawg on Mar 26, 2013 19:32:32 GMT -5
I have a buddy who bought a 1952 Piagio Vespa restored from a guy in Korea via Ebay and its a step or under museum quality . Love classic not plastic scooters . Best of all its a 2T , manul 4 speed and spare tire holder
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Post by woowilly on Mar 27, 2013 22:52:18 GMT -5
Truely unique. Preserve it!!!! I would weld up a bolt in adapter that bolts in and put in a modern engine & drivetrain & ride it. Then rebuild the old engine to stock to put back in when it comes time to sell it. Very few people have an interest in frankenstein bikes. Runinng and all stock bikes are easy to sell to collectors. (non-stock parts for engine internal parts that needed to be replaced help more than hurt selling price. )
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Post by timmo1 on Mar 30, 2013 20:13:11 GMT -5
I had a good day on Good Friday cleaning, rust killing, priming and painting parts that I'd taken off- Here's some of the 'pile' so far. That exhaust system weights A LOT....can't wait to see some oily blue two stroke smoke coming out of that again I've managed to find some compatible rings (fingers crossed) so apart from needing to remake a gasket, I think I have everything I need to put it back together.  I decided to remove the engine from the frame as well as it will make reassembling it a lot easier and the frame below it was really gunked up so that needs a good clean and paint  |
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Post by justbuggin2 on Mar 30, 2013 22:08:44 GMT -5
glad to hear you making progress hope the rings work out for you
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Post by timmo1 on May 18, 2013 20:31:11 GMT -5
An update- I've stripped the rear subframe back to the metal as there was a lot of rust under the original paint and the paint that the previous owner put on to cover it up.  And primered and painted it   One thing I couldn't do was remove one part of the rear transmission/Gearbox....since I don't have any sort of manual, I wasn't too keen to pull this too hard in case it broke (it's only soft alloy). Instead I cut the guard and pulled it off to strip/paint it. Then a small replacement piece was made to re-instate the cut piece.  I'm now stripping the wheels and repainting those while I wait for a replacement piston ring to come. |
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Post by peril787b on Jan 11, 2014 1:04:18 GMT -5
Hi Timmo, I'm also in NZ and have just purchased a Hallo because it looked rather interesting and should be a good project. Have you continued with your restoration and gotten it running?
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