37mm

I'm having one piece steel valves made in both 37mm and 35mm sizes. they are both around 0.75mm longer than the OEM parts so that the DVSKs can be fitted as near to the perfect 36mm length as possible. the backs are being machined with the same flow design as the racing valves and with...

for those of you with 2001 to 2003 bikes that are anything but a 400 (and some 501s but not all) you have 37mm inlets and they tulip badly. the present RRP on these in the UK is £92 EACH including VAT. i now have a supply of lightweight alloy steel race valves that have a waisted stem...

as discussed recently the 37s from OEM are £62 plus VAT in the UK so thats £73 per inlet. the problem as you know is that they tulip if revved on OEM cam and valve springs. i have had a few machined down that had gone south. suprisingly they can be saved at 36.8mm and with a taper...

here is one i hope dale will help me with: bored out 'scoots' 37mm carb to 41mm and it went ok after i decided to use araldite to bond the two lower chambers. i test rode my FE400e bike and to cut a long story short; the bike wanted to go leaner on the MJ. fine except i went through 150...