Cam swap Questions

[Guest]

I'm swaping a 650 top end onto my 550. The 550 cam will give me the powerband I want. My question is whether I should use the 650 bearing caps to match the 650 head or should I use the 550 bearing caps to match the cam but mismatch the head? Is there any kind of break in procedure I should be aware of? Thanks

[hampshirehog]

You should use the caps that came with the head. They are bored together to match.

For first start up make sure that you put some moly on your cams and liberally squirted oil around in the top end - in the bucket pockets etc.

On first few rides don't let the engine labour and don't be afraid to use the revs - use plenty of revs.

[ashdricky]

I'm swaping a 650 top end onto my 550. The 550 cam will give me the powerband I want. My question is whether I should use the 650 bearing caps to match the 650 head or should I use the 550 bearing caps to match the cam but mismatch the head? Is there any kind of break in procedure I should be aware of? Thanks

I built mine using the entire top end from the 650 and the 550 cams, everything else up top is from a 650. I'm located on Grand Island near Niagara Falls if you need any help with your conversion or would like to see my project. I have made several parts which are designed specifically for the 550/650 hybrid (aka 674) motor, if you are interested let me know

[wegs426]

I built mine using the entire top end from the 650 and the 550 cams, everything else up top is from a 650. I'm located on Grand Island near Niagara Falls if you need any help with your conversion or would like to see my project. I have made several parts which are designed specifically for the 550/650 hybrid (aka 674) motor, if you are interested let me know

Thanks, I might take you up on that offer if I run into any issues. How do you like the dyna2000? I am eventually considering one.

[ashdricky]

Thanks, I might take you up on that offer if I run into any issues. How do you like the dyna2000? I am eventually considering one.

Please feel free to come by if you have time, might give you ideas for your build. for me the dyna2000 was essential for the ignition kill while upshifting, in addition to the dyna 2000 a quickshift sensor is needed, as well as having the gear engagement dogs "backcut", Paul Gast of Fast by Gast is just a few mile away from me he did the machining work for me, all said and done I'm happy with it.
BTW ignition kill on downshifts is also possible but you will need to fit a slipper clutch which means more $$$ that I just didn't have.