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PostPosted: Sat Dec 15, 2018 11:38 am 
Expert racer

Joined: Tue May 18, 2010 5:38 pm
Posts: 1437
Location: New Hampshire
Country: USA
Bikes owned: Suz, Yam, Honda, Kaw.

I am interested in widening the Ex port on a T500. As you may know the Ex opens at the liner and takes a 45 degree turn as it exists the cylinder a ways to the muffler downpipe. The Aluminum of cylinder, inside corner sid , near muffler downpipe is where my question lies for advice.

I can tell the flow is low here since I see carbon build up. I feel I would like to take a few mm off the Al casting near muffler to improve flow and so I can widen that side of the cast liner with Burr porting tool and achieve a better flow though cylinder.

My concern is this Al may very thin near/just behind the downpipe exhaust donut and can't take too much off before breaking through. How much can I remove if that makes sense?

What have people done improve flow and especially widen the EX port and can shed somes advice (pic would be amazing).

I will do the same to intake port, but the Al material to remove is more near the cast liner and looks fairly thick.


Current Bikes
74 GT250 (T350 upgrade),
76 GT250 (T350 upgrade),
71 T350,
70 T350,
74 GT380,
75 T500,
73 GT550,
75 GT750,
72 Yamaha DS7 (R5 upgrade),
77 Yamaha RD400 (Daytona Cyls),

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