Print Page - 620 Heads to a M750 ?

Title: 620 Heads to a M750 ?
Post by: Von Eisen on July 22, 2015, 07:21:30 PM

G/Day guys, Id like to pick your brains ...

Im building up an old M750 (year 1997) ... I have a new set of 11.1 Ferracci drop ins Im going to fit and have been offered a set of 620 heads. Am I right in thinking 620 heads have larger valves and will fit up to the M750 motor ?

Brgds, Von Eisen

Title: Re: 620 Heads to a M750 ?
Post by: DarkMonster620 on July 22, 2015, 07:38:56 PM

they should and the engine will breath waaaaaay better

Title: Re: 620 Heads to a M750 ?
Post by: Von Eisen on July 26, 2015, 01:01:22 AM

Thanks DarkMonster620

Title: Re: 620 Heads to a M750 ?
Post by: DarkMonster620 on July 26, 2015, 07:11:14 AM

I want to do the opposite . . . put 750 piston in my 620 . . .

Title: Re: 620 Heads to a M750 ?
Post by: caperix on July 27, 2015, 06:15:50 AM

Quote from: Von Eisen on July 22, 2015, 07:21:30 PM
G/Day guys, Id like to pick your brains ...

Im building up an old M750 (year 1997) ... I have a new set of 11.1 Ferracci drop ins Im going to fit and have been offered a set of 620 heads. Am I right in thinking 620 heads have larger valves and will fit up to the M750 motor ?

Brgds, Von Eisen

Not 100% but I thought that the 620 & the 750 have the same size valves but the 620 has better cams. The 695 & 800 do have bigger valves. I have heard there are some compadability issues with the oil spigot on earlier vs late cylinders, but that may be just the bigger engines. Brad Blacks website has some good info on this http://bikeboy.org/duccamspec.html (http://bikeboy.org/duccamspec.html)

Title: Re:
Post by: Raux on July 27, 2015, 07:38:45 AM

696 heads are said to be the best of that size. Largest valves you can put on that bore

Title: Re:
Post by: Raux on July 27, 2015, 07:39:15 AM

And with 1100 cams is so fun

Title: Re: 620 Heads to a M750 ?
Post by: Von Eisen on July 30, 2015, 11:34:09 PM

Quote from: caperix on July 27, 2015, 06:15:50 AM
Not 100% but I thought that the 620 & the 750 have the same size valves but the 620 has better cams. The 695 & 800 do have bigger valves. I have heard there are some compadability issues with the oil spigot on earlier vs late cylinders, but that may be just the bigger engines. Brad Blacks website has some good info on this http://bikeboy.org/duccamspec.html (http://bikeboy.org/duccamspec.html)

Thanks for that caperix, I was talking to another member and he too expressed the same thoughts as yourself on the 620 and 750 valves and cams ... I may research the 800 option ... Great link btw, there is some very interesting info written there [thumbsup]

Title: Re:
Post by: Von Eisen on July 30, 2015, 11:35:43 PM

Quote from: Raux on July 27, 2015, 07:38:45 AM
696 heads are said to be the best of that size. Largest valves you can put on that bore

Thanks Raux, more food for thought [thumbsup]

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Moto Board => Tech => Topic started by: Von Eisen on July 22, 2015, 07:21:30 PM