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Post by boost on Aug 14, 2017 14:53:55 GMT 1
hi all ive been informed that if you fit the 350r cdi to the F2 this will allow a further 500 rpm at the top end as the F2 is not a rev monster, has anyone tried this swap and if so what results did you get if any , cheers inadvance
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Post by midlifecrisisrd on Aug 14, 2017 15:56:39 GMT 1
Hi
Wouldn't have thought an r cdi would help it rev as it was originally restricted with jetting and restrictors in the exhausts
I thought it was the same as the f2 other than it incorporated the side stand cut out switch control unit hence the extra blue wire that needs connected to 0v for it to work on an f2
It was the earlier n1/f1 cdi that was supposed to allow a little extra revs
Better sticking a pre programmed feel in it
Steve
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Post by boost on Aug 14, 2017 16:53:32 GMT 1
hi steve thanks for the reply I'm not sure either way I value any comments/input be interesting to see if anyone has done this and what results poor or bad
cheers bob |
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antos
Drag-strip hero
Posts: 298 
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Post by antos on Aug 16, 2017 12:22:19 GMT 1
hi all ive been informed that if you fit the 350r cdi to the F2 this will allow a further 500 rpm at the top end as the F2 is not a rev monster, has anyone tried this swap and if so what results did you get if any , cheers inadvance Hi boost, My f2 struggles to go beyond 8.5 k so I've fitted an offset woodruff key to give a bit more advance and it's letting me now go to 9.5k so very happy for a small outlay👍 When funds allow I'll get a new programmable system but for now I'm happy |
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Post by boost on Aug 16, 2017 13:24:01 GMT 1
hi antos thanks for the reply i dont want to sound a numpty but can you explain the offset woodruff key ??  cheers bob |
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antos
Drag-strip hero
Posts: 298
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Post by antos on Aug 16, 2017 15:36:01 GMT 1
Hi bob I'd never heard of it either so no worries 😊
Apparently they were used a lot in the 70s on cars etc
You take the flywheel off and remove the woodruff key on end of your crank, then replace it with the offset one, it's made in such a way that it allows the flywheel to sit further away from standard thus advancing the ignition a couple of degrees. Hth antos
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antos
Drag-strip hero
Posts: 298
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Post by antos on Aug 16, 2017 15:39:14 GMT 1
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Post by boost on Aug 16, 2017 17:44:02 GMT 1
hi antos thanks where did you get this and is there any noticeably improvement through out the rev range
cheers bob
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Post by jon on Aug 16, 2017 17:53:05 GMT 1
A word of warning about this, make sure you fit it the right way round.
If it's an F2, you might want to go for an adjustable billet stator plate. A little more expensive at £60, but more fine tuneable.
I've never fitted a zeal or similar. Do you have to advance the static timing more than standard on an F2? After all the unit will only retard the spark as it cannot advance it more than physical maximum advance.
Jon
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Post by midlifecrisisrd on Aug 16, 2017 18:39:20 GMT 1
A word of warning about this, make sure you fit it the right way round. If it's an F2, you might want to go for an adjustable billet stator plate. A little more expensive at £60, but more fine tuneable. I've never fitted a zeal or similar. Do you have to advance the static timing more than standard on an F2? After all the unit will only retard the spark as it cannot advance it more than physical maximum advance. Jon Standard static advance on a ypvs is around 34 - 36 degrees which is more than you will need in the midrange which is it's highest point Steve |
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Post by jon on Aug 16, 2017 19:15:06 GMT 1
Thanks Steve, that's good to know.
I guess the adjustable stator plate is the poor man's option then (apart from the extremely poor man's offset woodruff key)? I'd worry myself of shearing an offset key, even if in practice a well matched taper on the crank and flywheel should be enough to stop any rotational movement. I always use grinding paste to lap the flywheel to the crank.
That said most people use the 31k curve on a zeal to my knowledge? Is this not about 1 degree more advanced over the whole rev range than the F2? If so it's a cheap way of getting a '31k' map.
Jon
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Post by boost on Aug 16, 2017 21:01:19 GMT 1
Hi guys thanks for the input so its best to give the offset woodruff key a miss then ??
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antos
Drag-strip hero
Posts: 298
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Post by antos on Aug 16, 2017 21:54:55 GMT 1
Well it's up to you, I've fitted it and I'm happy, if you want to modify your stator plate or buy one from norbo that's the other option.
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antos
Drag-strip hero
Posts: 298
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Post by antos on Aug 17, 2017 9:08:15 GMT 1
hi antos thanks where did you get this and is there any noticeably improvement through out the rev range cheers bob Hi bob, I got it from Nigel at nk racing👍 |
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Post by boost on Aug 17, 2017 11:58:35 GMT 1
hi antos thanks
bob
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Post by jon on Aug 20, 2017 10:04:08 GMT 1
Hi guys thanks for the input so its best to give the offset woodruff key a miss then ?? I wouldn't necessarily give the key a miss. As said, it is a cheap way of finding out if it suits you. What I would do is make sure you lap the flywheel to the crank so you know there is no strain on the woodruff key. Being offset there is less metal there and so would shear with less strain on it to an original one. When a key does shear it can make a terrible mess, most probably necessitating an engine strip and crank rebuild. Jon |
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