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Post by Angus on Mar 28, 2011 20:00:00 GMT -5
I see your Revolution/Batavus and raise you a real Derbi Revolution! What's it got you ask? Well... 24mm carb, CR80 reed block, custom reed manifold, 70cc Metrakit (knockoff), hand made pipe (by me getin' bizo with my welder and some sheet metal, and yes that is an aluminum water bottle silencer), Dr. Pulley slider weights, MHR clutch springs, 17 tooth front sprocket (up from 13). Yes it goes fast. Yes I'm ok with that. With the larger front sprocket it's not a wheelie machine but it pulls hard up hills and does 55 MPH on the flat. I was also able to replace the broken rear fender with a N.O.S. one from 1977 mopeds, for only $20!!! So now that's done, what's my next project? Click on image to make larger... Attachments:
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Post by j2 on Mar 29, 2011 3:32:33 GMT -5
I like what you have done. what the F is a "Knock off" metrakit? you buy it in hong kong? I do think that derbis are pretty ugly as far as mopeds go. but I kinda like ugly. I hope you can bring it out once or twice so we can go head to head.
I am running a 24 mikuni flatslide, a 8 petal tassinari reed, and starting with 18 /30 for gearing, 16 inch wheels. and a front disc brake. I should be able to test it and do some final tuning this week, assuming I get the chain that is on order soon.
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Post by Angus on Mar 29, 2011 12:07:30 GMT -5
Yah, sometimes I look at this thing and think…that’s cool. Other times I just think it looks totally gay.  The “knockoff” is the new kits they have in at Treatland. I think someone bought out Metrakit now that they are toast and are using their castings for making these now. The cylinder is the same but doesn’t have “Metrakit” stamped into it. Also, it comes with an Airsal piston. Still rocks out though, nice big square exhaust with boost ports. Have fun tuning that thing. Mine was a pain to jet properly. I guess jetting should be the very last thing you do, not change it every time you get a new part. |
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Post by j2 on Mar 29, 2011 13:08:32 GMT -5
hmm weird. I have an extra metra piston, i was thinking those were real metra cylinders missing the rest of the goodies and they found a piston that would work to complete them. Shitty for them to list them as metrakits if they aren't. Is the quality still good?
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Post by Angus on Mar 29, 2011 14:12:41 GMT -5
Seams to be. I mean it goes like hell. We'll have to see if I sieze it or not. The piston is definitely tight in the bore. Similar to a Polini 208 if you're familiar with those kits. Running Motoul 800 and 94 octane just to be safe.
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Post by j2 on Mar 29, 2011 21:12:12 GMT -5
what size sprocket do you have in the rear? And are the wheels 17 inch? where did you end up getting the 17 inch front sprocket?
I found out they are basiacally just honda mc z sprockets.
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Post by Angus on Mar 30, 2011 9:00:06 GMT -5
Not sure what the rear is. I'll have to count and let you know. The front is a 17 Puch front sprocket. I cut out the center and welded it on to my stock 13 sprocket, which was just enough smaller that it doesn't touch the chain. Crazy I know but it works.
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Post by Angus on Mar 30, 2011 9:53:55 GMT -5
34 tooth rear and 16" wheels.
Let me know how your 18/30 gearing is. Might be better suited for the highway rather than the track.
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Post by j2 on Mar 30, 2011 11:26:39 GMT -5
thanks for the info. I am gonna try some different gearing combos today. on a side note, I did my first run on a 24 flatslide, it was good. then swapped in a 28 flatslide for kicks. lordy lordy, it was a huge difference. low end pull was noticeably stronger.
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