Also I bet if you get a different boot from the carb to the reed cage it might work better, something with more angle assuming you can, it's been so long since I have fooled with a 250r
I heard the 400ex chassis is a lot easier to do this too, I wonder how much of this 450r will swap to that? I wouldn't mind buying the frame and doing the swap and having both bikes going
I did the 400ex swap and had same issues. Sprocket and pivot bolt relation is important. 2 stroke sits much higher so I just notched out cross member and plated the hollow cut out for carb boot to clear
Do they make a different carb boot? Or has anyone tried it? I need to see if I can dig up an old reed cage and carb to try some stuff out
Can you just weld the lower rear engine mount in like on the newer frames and then cut the lower part of rear mount/swing arm spacer off? Looks like you could make the rear mount/swing arm spacer upper bolt hole position where you want it pretty easily or just do away with it and then you wouldn't be changing the rear suspension geometry. Pictures may be misleading but that's how I would probably try it from what I see.
The swing arm pivot should be kept close to the countershaft the same as Honda has it.
I'm going to find some ruined cases which we may have and mock this thing up