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DannoXYZ · June 6th, 2018, 04:10 PM

Not a chance. The 400 has perimeter frame and engine hanging points are completely different. Also subframe, swing arm and shock bolts to 400 engine. Those areas will bump into 300 frame.

I guess if you scavenge enough of 400 frame and cut & weld pieces of 300 frame to it, that can work.

Tank from 400 also doesn’t have hump to clear backbone frame on 300. You’ll need tank for fuel-pump and EFI system. Carbs on 400 engine will lose you 5-7hp and you won’t be much faster than 300 because of extra weight over a clean 400.

June 6th, 2018, 04:10 PM	#2
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Not a chance. The 400 has perimeter frame and engine hanging points are completely different. Also subframe, swing arm and shock bolts to 400 engine. Those areas will bump into 300 frame. I guess if you scavenge enough of 400 frame and cut & weld pieces of 300 frame to it, that can work. Tank from 400 also doesn’t have hump to clear backbone frame on 300. You’ll need tank for fuel-pump and EFI system. Carbs on 400 engine will lose you 5-7hp and you won’t be much faster than 300 because of extra weight over a clean 400. Last futzed with by DannoXYZ; June 6th, 2018 at 08:16 PM.