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Post by breezer on Apr 14, 2007 18:53:18 GMT
I have a pair of BARE PK forks, and I'm not sure which PK they came out of.
What do I need to put a disc brake onto them and fit them into my primmy?
I've heard various stories that LOADS of modifications are required, and also that NO modifications are required.
Cheers
jim
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Post by hank on Apr 14, 2007 19:43:36 GMT
jim, I think the only type of PK forks you can fit a disc to are these, which have a 20mm axle:  theres a bigger gap between the shock and fork and the triangular bit at the bottom. you can spend about £210 for a grimeca semi-hydraulic kit  or go for full hydraulic but you'll then need a master cylinder on headset, so some more work to do there. there may have been a kit for 16mm axles but not sure what forks they go on  The only other thing is I'm not sure what you have to do at the top for a primmy not so sure its a straight fit at the headset. An expert like juan or oz will tell you that...... |
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Post by ozoap on Apr 14, 2007 22:23:30 GMT
The 20mm forks go straight in. Head set will fit. The biggest pain in the arse is fittting the front mudguard. They are about an inch longer between the bottom bearing and the top shock mount. Doesn't show as much with the 50 special, I moved the horn casing down about 1/2 inch  |
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Post by Juan on Apr 15, 2007 9:31:22 GMT
Off the top of my head you may need to move the position of the steering lock but I'd need to check on that.If they're off an XL the stem will be around an inch longer and threaded all the way to the top.You'll need to cut the extra length off and remove the excess threading.
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Post by mikea565 on Apr 15, 2007 17:42:48 GMT
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Post by mikea565 on Apr 15, 2007 17:51:37 GMT
 Aha ! |
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Post by breezer on Apr 15, 2007 18:13:26 GMT
Just been out to check mine's still in the garage after looking at that pic Mike!!!!!
I was dreading opening the thread, was expecting "Have you not done that yet Jim???"
ha ha
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Post by ozoap on Apr 15, 2007 18:50:35 GMT
The Rotax has a SS90 mudguard...I enjoyed cutting that about ;D
Didnt bother doing anything with the steering lock. I never use one.
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Post by hank on Apr 16, 2007 19:16:07 GMT
jim, you worked out which pk forks you got yet?
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Post by breezer on Apr 17, 2007 4:53:30 GMT
I know that they are 20mm ones.
that's all...
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Post by Juan on Apr 17, 2007 6:06:46 GMT
Take a picture of the neck of the stem Jim. And if you were thinking a fully hydralic system then you might find this handy.  |
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Post by breezer on Apr 17, 2007 13:30:20 GMT
Cheers Juan, seen that and was planning on using that!
Why take a picture of the neck of the stem?
Will you be able to diagnose a model from that?
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Post by Juan on Apr 17, 2007 17:47:32 GMT
I'll be able to tell you if it's a PK or XL item.
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Post by breezer on Apr 18, 2007 5:41:52 GMT
OK will do Juan. (Anorak!) |
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Post by breezer on Apr 18, 2007 21:20:43 GMT
Here you go Juan, name that fork in one!   Jim |
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Post by hank on Apr 18, 2007 21:29:17 GMT
PK
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or go for full hydraulic but you'll then need a master cylinder on headset, so some more work to do there. there may have been a kit for 16mm axles but not sure what forks they go on 
The only other thing is I'm not sure what you have to do at the top for a primmy 
