samyam

the whole top tube from the head stock to the raer loop was left alone ,the tail that run down from the top rear shock mounts were bent sligtly forwards

yes the standard air box was used but about 40mm was cut off the bottom to allow for the higher swinging arm , the 320/350 had a slot cut along the top right side 10mm deep and 70mm long to help with better air flow ,using the standard filter . the 175/200 used the standard filter and air box ,the 100/125 had the restrictor tube removed in the bottom .

there must have been about 100 -130 ,250 frames modded and about 70 -100 175/200 frames modded which were much easier to mod .with the bottom rails chopped out with the lower engine mount and tube pivoted upwards and a flat bash plate fitted and the top rear shock mounts lowered with girling 2927 gas shocks fitted .

the works production frame majesty,s had just the same frame as the production bikes . the rear shocks were extended bt 3/4 " that was the only frame mod from production models. there were 10 sets of higher 5th gears made for the 6 days . with 26 mm carbs fitted . the 320cc had the back plate slotted 10 mm to stop them running back wards with the timing set at 2.3 mm bdtc , when pulling high gears they were prone to getting close to top dead center , then going backwards which was very scary ??? . the front exhaust pipe was extended on 2 bikes 1 with smaller dia pipe . and different compression ratios tried along with exhaust port heights ,transfer port angles . lowering of cranckcase compression levels by removing the blanks from the crank flywheels . my bike was a full blown 360 cc with an IT 425 piston fitted 26 mm carb which pulled very well. the godden works bikes x 10 had lighter frame tubing to save weight but all the dimentions were the same as the production models using the same jig ..

the head angle was not altered on the modified yamaha frame and the main back bone was left alone.The front down tubes were bent slightly back ,the rear 2 engine mounts were removed still attached to frame where the swinging arm and foot rest are located ,This was cut down where it joins the main back bone .the 2 rails that run down from the top rear shock mounts we bent supwards the section behind the toolbox had the lsft side cut out and a bit welded back in to make room for the spark plug and cap to fit in to .The swinging arm was not modified apart fron a strip welded on the top front section to attach a chain pad .