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Post by stokescoot on Feb 8, 2009 12:18:54 GMT
hi all,
was wondering if any one has fitted et2/4 forks into a traditional vespa frame (150 sprint ) i've tried them in the frame and they are certainly too long, would it be best to shorten the et2/4 ones or weld the 150 sprint stem to the et2 forks? i'm a welder so either method should be ok just wanted to know if any one got any expierence of doin this. I'm also goin to use the et2/4 muddy if i can should look sweet.
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Post by madmax on Feb 8, 2009 16:49:30 GMT
I've never done it myself but I believe you'll have to cut the stem and weld the standard one on it. Ask Ash, I think he has done before.  |
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Post by cezeta on Feb 8, 2009 22:24:21 GMT
i believe beedspeed convert these for you if its a pain in the ass to do it yourself
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Post by fruitjuice on Feb 11, 2009 21:25:37 GMT
I've done several, a couple of PK125-forks into Rally/Sprint/GS160, and several ET2/4-forks into PX and Bajaj frames. It's fairly straightforward, just takes some time to do it right. I measure the original forks from bottom steering race to the bottom of the thread on top of the stem and write that down somewhere. Then cut the ET4-forks about 5 inch above the bottom steering races, and cut the stem of the original forks so that when joined together the distance between the bottom steering races on the ET4-forks and the bottom of the threads on the original stem are your measurement you wrote down somewhere (this will ensure that the threads on top will be in the correct position afterworths). Also might want to mark the front of both stems so that when joined together the steering column lock is in the correct position. I then chamfer both tubes under 45° all around right down to the inner diameter so you have a sharp edge on both. I then insert a 10 inch long 22mm thickwalled tube (the inner diameter will usually 22mm on both, but measure to be certain) halfway down the bottom part of the ET4-forks, and then slide the original forks over that. The sleeve will make sure the forks are properly aligned, and you can be certain the fweld will be strong enough. Where both parts meet you now have a 90° V-shaped groove all around the tube to weld up. Start up with three or four good tacks around so it doesn't pull to one side when you start welding, and check alingment again before proper welding. Make sure the first weld is a penetrating weld that welds not only the two fork-tubes together, but also welds these both to the inner sleeve and 'Bob's your uncle'. Then just weld up the V-groove, clean up, and fit...! Well, that's how I do them....    |
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Post by shrew on Feb 14, 2009 0:44:43 GMT
What are the advantages/disadvantages of this conversion?
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Post by petek on Feb 14, 2009 18:15:02 GMT
i'm doin it because i got the complete front end for peanuts, its gota disk brake, it will be different with the wheel the "wrong" way round, should handle pretty good compared to my sprint forks etc
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Post by cezeta on Apr 18, 2009 11:10:27 GMT
me and sugarlump just did the cut and shut on a set of pk forks to extend the headstock tube for my girlfreinds 125 super/p2 so she can have a disc set up
we used 21.3 mm tube which was a tiny bit loose then cut in a piece from another scrap set of pk forks. they looked a bit wonky during welding but by the time they were finished they were spot on
a bit stressfull on your first attempt but lucky we had a pro welder to help us.
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Post by hank on Apr 18, 2009 13:27:39 GMT
they can look good/different, but i was under the impression that after trying it with the V98, they were switched to the other side as the scooters didn't "damp" correctly?
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Post by tony on Apr 18, 2009 19:23:21 GMT
I hope you sleeved that fork tube Cezeta? I for one dont trust welded forks without sleeving. At least a spigot machine on the two halves anyway.
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Post by sugarlump on Apr 18, 2009 19:36:40 GMT
The 21.3mm gas tube was the sleeving tony, nice and thick it was too. Hope the welder on the building site didn't miss it the next day ;D
We then cut a 3/4" section from a dead set of forks (because we needed them lengthened), V'd all the joins and got a grown up to weld it whilst it was heavily clamped to a section of angle iron.
I think they turned out pretty good considering my first cut with the angle grinder was totally pissed ;D
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Post by tony on Apr 18, 2009 22:24:26 GMT
Good lad. ;D
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Post by cezeta on Apr 19, 2009 17:45:46 GMT
dont worry tony you will not find a more paranoid pair of overcautious tarts than me and sugarlump.......ben was even measuring the angle of my ground out "v" sections......  we were supervised by the welder who is a top hotrod builder pal of bens........we only used round ended scissors ;D |
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Post by tony on Apr 19, 2009 23:15:26 GMT
another "good lad" ;D
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