Class A

mbracing748 · 24-Sep-2013, 12:04

I hope to run in the DD series next year, as I have a national license I need to run in the Class A 618cc.

Looking at the regulations it mentions that everything about what you need to keep. My question is – because the 750ss uses the same bottom end can I change the Heads, Barrels and pistons for the 618cc, or do I need to run the 600 cases?

I’m currently building a Race 888 so I’m trying to keep the cost down for the first year. So I'm looking at different ways of obtaining a bike as there does not appear to be many Class A bikes for sale or even rent.

What I should have asked is:- Can I use a 750ss / monster Bike and downgrade to a 618cc. Looking at the regs everything can be upgrade to a 750ss spec apart from the engine CC.

Ghost · 24-Sep-2013, 13:08

You can use your 750 cases just be mindful of the oil ferrule between the cases and barrels as on my 750 cases the holes are larger than the 618.

bally71 · 24-Sep-2013, 13:28

I think the stroke is different

mbracing748 · 24-Sep-2013, 13:38

same stroke 61.5mm

620 - 80mm bore
750 - 88mm bore

750 Valves are the same size.

mat2hew · 24-Sep-2013, 20:14

would it actually be cheaper to replace the heads & barrels? a used engine ain't that much.

dunlop0_1 · 24-Sep-2013, 22:06

James Gerrard has a cracking A bike for sale.

https://www.facebook.com/photo.php?f...13 917&type=1

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24-Sep-2013, 13:08	#2
Ghost Registered Forum User Big Twin Bikes: Ducati 749, Phil Read Replica, DD 620 Posts: 1,830 Join Date: Mar 2008 Location: Coventry Mood: 2011 DD Class 'B' Champion You can use your 750 cases just be mindful of the oil ferrule between the cases and barrels as on my 750 cases the holes are larger than the 618. Reply

24-Sep-2013, 13:28	#3
bally71 DSC Club Member Mille Bikes: 620SS Desmo Due 800SS Minitwin 1000SS Monster 750 Posts: 391 Join Date: Apr 2008 Location: Wirral Mood: Inquisitive cat I think the stroke is different Reply

24-Sep-2013, 13:38	#4
mbracing748 Registered Forum User Mille Bikes: Anything I can get my hands on. Posts: 178 Join Date: Dec 2005 Location: Middlesex same stroke 61.5mm 620 - 80mm bore 750 - 88mm bore 750 Valves are the same size. Reply

24-Sep-2013, 20:14	#5
mat2hew Registered Forum User Big Twin Bikes: Monster 620ie, 916Bip, Suzuki Gs500 And a Ridgeback but I have to pedal that one Posts: 1,000 Join Date: Aug 2008 Location: Maidstone Mood: Scared! would it actually be cheaper to replace the heads & barrels? a used engine ain't that much. Reply

24-Sep-2013, 22:06	#6
dunlop0_1 Registered Forum User Big Twin Posts: 1,568 Join Date: May 2009 James Gerrard has a cracking A bike for sale. https://www.facebook.com/photo.php?f...13 917&type=1 Reply