|
|
Post by unreliablesc on Jan 14, 2008 18:22:59 GMT
So, I got my self a set of ET4 forks.
Oz, you say in your project thread that you shorten the stem.
Do you shorten them as in just cutting the top of, or cut and weld?
As i cant fucking weld, and thats a fucking big problem I'm always looking for the easy way to do stuff like that...
It is probably cheaper for me to get the right die than getting someone to weld them...
|
|
|
|
Post by willspeed on Jan 14, 2008 21:03:24 GMT
my mate put a pair of auto forks in his cutdown, he chopped the top of the vespa forks off and welded them on the bottom of the auto forks.
|
|
|
|
Post by guy160 on Jan 14, 2008 23:03:57 GMT
either or. Cutting down and cutting new threads would work, so would cutting out the required amount and rewelding. with a tube down the join to strengthen. Or a solid bar if you arent arsed about a speedo... ;D ;D ;D
|
|
|
|
Post by unreliablesc on Jan 15, 2008 20:07:53 GMT
either or. Cutting down and cutting new threads would work, so would cutting out the required amount and rewelding. with a tube down the join to strengthen. Or a solid bar if you arent arsed about a speedo... ;D ;D ;D Yeah, thats what i want to do, and probably what I'm going to to, just need to find someone that can do the job for me. speedo? I have given up vespa speedos long time ago. bike computers work so much better. |
|
|
|
Post by ozoap on Jan 15, 2008 20:13:33 GMT
I shortened mine, can't remember how much, then re-threaded. The thread is 30x1.5
Im an engineer not a fabricator ;D
|
|
|
|
Post by unreliablesc on Jan 15, 2008 20:20:13 GMT
I shortened mine, can't remember how much, then re-threaded. The thread is 30x1.5 Im an engineer not a fabricator ;D I don't have either a std. or th ET4 fork in front of me, so i keep asking stupid questions...  You cut, re-thread, and then, do you have to grind off the thread at the top, or is the plastic shim on top of the ET forks long enough that I don't have to?  |
|
v100
50 Special
Posts: 36
|
Post by v100 on Jan 15, 2008 22:57:28 GMT
I have modified a set of forks for a small frame. I used PX & shortend the lenght of the tube, this was done by marking the tubing so the shortend tube would be aligned keeping the steering lock in the correct postion. Next tube was cut in circular chop saw & a weld prep ground onto both tubes. A simple jig was then constructed to hold the two tubes together straight whilst being tack welded together. This was then checked for correct alignment before being fully welded together. Problem I had was the the steering bump stop was on the wrong side, this was over come by cutting out a new bump stop from the ally casting on the forks, Fitts scooter very well, should mention it is running a hugger not the standard mudguard. This was made from a lambretta rear mud guard with a lot of cutting & welding to get the correct profile.
Hope this might be of so help
|
|
|
|
Post by unreliablesc on Feb 3, 2008 16:09:10 GMT
How tight would you make the tube that's going to sit inside the steering column ?
0.1 mm clearance?
|
|
|
|
Post by tony on Feb 3, 2008 21:32:43 GMT
unreliable sc- mate why do you want to fit et forks in? The fork leg is on the wrong side for a vespa. |
|
|
|
Post by unreliablesc on Feb 4, 2008 15:22:37 GMT
unreliable sc- mate why do you want to fit et forks in? The fork leg is on the wrong side for a vespa. well, It's the cheapest way to get disc brakes (free) I like the look of ET forks in a Vespa If the handling gets fucked up then I just have to kick myself in the ass and stick a PK fork in there. I really cant see how it would make it handle bad anyway. |
|
|
|
Post by tony on Feb 4, 2008 15:50:06 GMT
well you don't get much cheaper than free! On the handling side there must be a reason why the chassis designers done what they have (damper/spring on same side as engine mass). It must be something to do with keeping this mass damped in a straight line, rather than in a diagonal. Let us know how it handles mate. I was looking at this conversion a while back in racing arguing with the board that the et4/2 was a smallframe in essence and so a disc should be allowed! They didnt go for it tho.  |
|
|
|
Post by hank on Feb 4, 2008 16:12:30 GMT
used in some racing though:-  guess i should have persuaded you to let me have those forks for xmas Oz ;D  |
|
|
|
Post by unreliablesc on Feb 4, 2008 16:36:38 GMT
used in some racing though:- looks like it doesn't handle to bad... I'm hoping to get the welding done this week, but it could be a while before they go in, I have to build a engine to suit first... a mate did an interesting conversion, pressing the axle from a ET on to PK forks, and made it fit using an modified PX calliper holder if i remember right: Photos stolen from here: www.meshmen.com/race/  |
|
|
|
Post by Juan on Feb 4, 2008 21:53:09 GMT
I've never rode a smallframe on ET forks but I have rode Oz's 'crosser and it makes a huge improvement on largeframes.
I like the idea of a ET link on PK forks,the extra length of the link should drop the front a little and sit better on V frames as well as steadying up the steering and braking.
|
|
|
|
Post by pj on Feb 4, 2008 23:00:21 GMT
i used et4 forks on a previous pk, and it handled lik a pig. pulled badly to one side when braking hard, and the std et4 shocks where crappy. it was like the rake didnt match the forks, so the front felt dead IMHO.
i use pk forks now with a disk and biturbo, and my bike handles like a dream.
paul
|
|
