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Post by timmo1 on Mar 5, 2013 20:32:28 GMT -5
This is a continuation of my old thread at ScootDawg (RIP wee fella) Hi there- I'm Tim and I've just purchased 1974 Daihatsu 'Hallo'...never heard of it? That's because only a couple of thousand were made- Most stayed in Japan but a few made it to the USA and some down to where I live, in New Zealand. They actually came in two models- A 50cc two stroke and an electric powered model. It's a three-wheel scooter with the two wheels at the back sitting on a subframe which also holds the engine. The front is similar to other scooters of the period and tilts when you corner (while the rear section stays flat).  Anyway, long story short- I'm wondering if anyone can give ANY help in the form of photos, diagrams, compatible parts etc. My one had a ring failure 10 years ago and has scored the top of the piston- I'm hoping to resurrect the ol' girl and get it going again  However, finding parts may be difficult and the lack of reference material might make things hard as well (I've been hammering Google since I got it to try and find information) I have seen a couple of old Yahoo group posts from the USA talking about the models (with one gentlemen alluding to the fact he had a service manual for one, hurrah!) so thought I might as well make this forum my base for the rebuild Thanks in advance |
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Post by timmo1 on Mar 5, 2013 20:48:40 GMT -5
Thanks to 'Motts' and this diagram: get2itparts.com/download/pistongrid.pdfThere appear to be a couple of pistons which could fit The dimensions of mine are: Piston Diameter: 41mm Piston height: 50mm Pin diameter: 12mm Crown to top of piston: 3mm Pin to crown: 22mm 'Window' width: 25mm 'Window' height: 15mm There is a TOMOS/PUCH piston which is broadly similar in a 42mm dia (since I'll likely need to bore it out due to some scoring of the cylinder walls) but it only has 1 ring- Is this likely to be a problem? Although the dimensions of the intake/exhaust windows aren't listed, the total height of the piston would need to be shortened by 4mm too- Is this likely to be a problem? |
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Post by prodigit on Mar 5, 2013 21:05:48 GMT -5
I'm sure there are a lot of aftermarket parts that would fit.
But finding the right ones, and finding the cheapest ones in the right ones may be a long search!
Sometimes a specialized bearing would fit costing you $45, while another from the chinese market could cost you $2-$5; but finding it... that's gonna be a pain I bet!
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Post by alleyoop on Mar 5, 2013 21:07:20 GMT -5
That is an very nice looking Trike scoot and very different. This is the first time I have seen one like that Thanks for showing it to us. We of course will try and google for any information for that model.
Hopefully one of us will get lucky and find something that might help.
Alleyoop
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Post by timmo1 on Mar 6, 2013 3:07:20 GMT -5
Another question- Any thoughts on if I can use this piston? It has a) pockmarks on the top of the crown from where the busted ring was based around b) a portion missing on the skirt   Generally its easy to just 'buy a new one'....but with this, it isn't that simple.  |
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Post by justbuggin2 on Mar 6, 2013 4:49:24 GMT -5
you may want to check with a chainsaw repair shop they may be able to find a replacement piston and rings that will work
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Post by allknowingwizofoz on Mar 6, 2013 14:38:08 GMT -5
Sand and shave that piston, its is still reusable. The rings are whats going to be fun to find. That ring landing is very deep.
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Post by timmo1 on Mar 6, 2013 16:14:37 GMT -5
Is it just a case of sanding out the imperfections? How much can come off before I need to start worrying about loss of squash area?
Is the loss of part of the skirt OK? (it may be hard to see in the picture but is just by my thumb in the second picture)
I *think* I can find some replacement rings from the TOMOS 41mm listed in the pdf above....from the remains of the rings off my piston they are around 1.8mm deep (I can't measure the ring land depth exactly as my calipers are too thick) but I'm not sure how deep the TOMOS rings are (at a guess they are square 1.5mm X 1.5mm)- Would 0.3 of a mm make too much of a difference or would they just 'float' a bit more?
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Post by timmo1 on Mar 11, 2013 2:50:35 GMT -5
Bump?  |
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Post by wangchicken on Mar 11, 2013 3:29:54 GMT -5
Now thats A find PLease post pics of you project
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Post by timmo1 on Mar 12, 2013 1:28:45 GMT -5
Well, here it is as I got it- Lots of rust and grime that needs to come off- Im stripping parts, removing paint and rust and repainting as I go: It's a good way to learn a bike!   Currently I'm stripping and cleaning one of the rear shocks and I've already cleaned and repainted the exhaust and some of the covers while I try and source a piston/rings. |
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Post by justbuggin2 on Mar 12, 2013 8:41:43 GMT -5
i believe that Lawnboy mowers are 2t and the piston and rings might work for on of them
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Post by timmo1 on Mar 13, 2013 22:01:38 GMT -5
i believe that Lawnboy mowers are 2t and the piston and rings might work for on of them Sorry I dont know what you mean by '2t'? I also can't seem to find any diameters of those rings? |
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Post by skuttadawg on Mar 21, 2013 0:15:56 GMT -5
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Post by JR on Mar 21, 2013 1:05:03 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?
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..BAD TO THE BONE..
