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Hyabusa Front End Conversion

stu56

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Thanks for reminding me as I seem to have been telling porkies, as I now remember a chap on cbrxx.com who goes by wolfieblue22 was doing the busa swap in 2011 and he tracked down the bearing at the same place , then it was $50 plus silly postage money . Being a tightwad I bought 2 of the 30 47 12 bearings from Hong Kong plus had a spacer made for just under half the price.
 

stu56

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GEG247 Is that the bird master cylinder on the bike? If you are planing to use this it will be way too small . An ideal ratio is around 27:1 . The birds master cylinder is 13mm which gives you 48:1 . The Brembos have 8 32mm pistons which give you an area of 6434mm sq compared with 2572 mm sq for the birds 6 front pistons ( delinked and drilled) A 17mm piston gives you 28.3:1 (softish) 18mm gives you 25.28:1 and 19mm gives you 23:1. a ratio of 19:1 would be rock solid with no feel (wooden)
 

gegg_247

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Wow....thanks for the highly detailed info. The pictures I posted are only of the test fit I did quickly to make sure I had clearances as the yokes were the first ones the guy had made (need not have worried they were perfect).

Since then I have stripped it all down and done a complete fit, had to re route some cables and bugger about with the height a bit but it's almost there now ready for the sunshine. Had the mudguard painted to match and got carried away and fitted a Nitron shock (with hydraulic preload adjuster)!

It looks pretty good, I'll post some pics when it's done.

I was actually going to ask someone on here about the brakes as this was causing me concern....I was thinking that I would run two hoses to the rear and that this would probably be ok, I have read that this is what others have done (should look nice as well). Do you have any recommendation for a front master cylinder or should I just go with one from a Hayabusa?

Thanks

Geoff
 

slim63

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I was actually going to ask someone on here about the brakes as this was causing me concern....I was thinking that I would run two hoses to the rear and that this would probably be ok, I have read that this is what others have done (should look nice as well). Do you have any recommendation for a front master cylinder or should I just go with one from a Hayabusa?

Thanks

Geoff

I ran a single hose to the rear operating just 2 of the pistons & that along with a change of master cylinder to 5/8 from memory gives an excellent controllable rear brake @tu*


The busa front master cylinder or one of the same bore & stroke is what you need if using the stock busa brakes :-0) if you don't have one be careful you don't end up with one of the dodgy gsxr ones that are still being sold on ebay
http://www.motorcyclenews.com/news/2013/october/oct1813-massive-suzuki-gsx-r-recall/
 

stu56

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I have just bought a pair of new Brembo's that are fitted to the GSXR1000 and Hayabusa http://www.ebay.co.uk/itm/Suzuki-Ha...564424?hash=item1ea70b7388:g:FmoAAOSweuxWRfDq .These are to replace the Yamaha R1 Gold spots i had on the busa forks. I don't know what size the 2015 hayabusa master cylinder is but i am looking at either 18mm or 19mm. If you go for brembo ,Accossato aftermarket cylinders , 19x18 will give you a lever wth more feel while 19x20 will give you a harder lever with less feel. As for the rear brake i ran 2 lines and it is as hard as rock with no feel.
 

gegg_247

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I managed to get the original master cylinder from the actual donor bike of my forks so I am hoping that this will be ok.....think I'll test it before I shell out for an ASV lever to match my existing clutch one. ASV stubby brake lever for a Honda blackbird anyone!

As to the rear, I'll be guided by you chaps and I'll blank the centre and just run one line to the rear.

Thanks again.

Geoff
 

stu56

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14 mm seems on the small side , The R6/R1 calipers i have just taken off has a16 mm master cylinder but would be better with a 17mm. What is the size of the master cylinder fitted to the GSXR 1000/ Hayabusa fitted with the Brembo calipers? These have 4x 32mm pistons.
 

CBRDEAN0

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14 mm seems on the small side , The R6/R1 calipers i have just taken off has a16 mm master cylinder but would be better with a 17mm. What is the size of the master cylinder fitted to the GSXR 1000/ Hayabusa fitted with the Brembo calipers? These have 4x 32mm pistons.

I agree 14mm does seem small but that is what is cast in to the side of it for my 2008 front end. ( the Haynes manual and various rebuild kits also confirm 14mm on the 2008 and later bikes )

Don't forget that the lever ratio also has a big part.

You can have a very high fluid ratio but calm it down with a low lever ratio.

The brembo style radial masters only have an 18 or 20 mm lever fulcrum point.
They rely on a larger piston being moved a small distance for braking.

The std Hayabusa uses a 27mm lever fulcrum point.
It relies on a smaller piston being moved a longer distance for braking.
 

gegg_247

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OK so now I am officially confused, I guess I will just have to do this through trial and error.
 

stu56

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I think the R6 is 16x20. I am looking at replacing the brake with a Frando master cylinder which is 19x18 . The clutch is 17x18 but they do a 14 15 16x18 but the smaller sizes are harder to find.
 

CBRDEAN0

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OK so now I am officially confused, I guess I will just have to do this through trial and error.

I am sticking with the master cylinder that was fitted to the 2008 Hayabusa with it's radial brakes.

It works on the Hayabusa so it is a good starting point for now.

The master on the latest Hayabusa is still 14mm but the calipers have now changed :

2008 models were 2 x 32mm & 2 x 30mm
Latest calipers are 4 x 32mm
 

stu56

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Yes i have just bought a pair of new Brembo's in blue . Teut is hoping to have my forks ready at the end of the week.
 

stu56

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Just had a call fom Teut at SW Suspension, My forks are ready .
 

CBRDEAN0

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I am collecting on Saturday Morning about 9-9.30

I hope the fekkin traffic is better for you than it was today.

Took 3 hours to get from Preston to Wakefield Europort this morning and over two hours coming back this afternoon.
 
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