20 replies to this topic

[jpw1275]

Hi all.... I've got the "yellow bible" and ive been reading up on knife edging etc.... But I'm unsure on one thing..... Is it just the rear edge (air filter side ) or do you do both front and rear of the butterfly disc?

Cheers james

Edited by jpw1275, 15 June 2014 - 12:05 PM.

[Gremlin]

Just air filter side

[jpw1275]

Cheers gremlin.... I've done correct then .....

Thanks james

[Ethel]

Trimming down the screws will give most improvement.

[Dusky]

Do you take the screws out to trim? Because you dont really have lots of space while they are in the carb, but how do you get them back in with the thread being filed on?

[sledgehammer]

one thing to remember when cutting down screws is loctite them

 

esp the split screws (can't remember if they were on the mini SU - think they were)

 

do they still smooth the bridge as well ?

 

lost my bible - got to get a new one (

[jpw1275]

Yea I've cut the top bridge off and trimmed the bottom bridge..... Got the original screws at the moment until I find some flatter ones...... Yes it's easier to take the butterflies out to do it
...... Pictures are coming after I've chopped 2 onions up for the BBQ .....:0)
Cheers james

Edited by jpw1275, 15 June 2014 - 01:20 PM.

[Ethel]

Doing anything to the bridge (raised bit around the jet) is asking for trouble if you don't have the means to sort the fuelling out afterwards. The most I'd do is put a light radius on the little bit of piston that remains in the venturi at full lift.

[jpw1275]

Il be putting it on a rolling road to have set up anyway so they can sort the fuelling out lol

[jpw1275]

Doing anything to the bridge (raised bit around the jet) is asking for trouble if you don't have the means to sort the fuelling out afterwards. The most I'd do is put a light radius on the little bit of piston that remains in the venturi at full lift.

I've done that aswell

[Dusky]

^ pics or it aint happened

[miniman24]

For comparison, heres my old HS4 - did all the Vizard mods but maybe went a bit too far with the piston radius-ing (it was my first time ) and in these pictures, the screws for the butterfly arnt fully reduced - they were before fitting. Noticable power increases from these mods - I now have twin HS2's and intend to do the same mods to them in the near future.

 

P1010066 by victorkristiansen, on Flickr

 

P1010067 by victorkristiansen, on Flickr

 

P1010069 by victorkristiansen, on Flickr

 

P1010070 by victorkristiansen, on Flickr

[jpw1275]

Heres a few Piccys..... They need a good clean aswell.....













Also had the sides of the inside smoothed to get rid of all the sharp edged etc

Cheers james

[Dusky]

Looks neat!

[jpw1275]

The casting inside isn't the best as standard