ditchdr
Registered
Ok for those who dont know,
Over the past 2 years I have been building a race bike.. It is a 06 LE Busa. 1500cc, with some spray on it.. I spared no money building this. EVERYTHING was top shelf.
Yesterday was dyno day. Bike has a motec digital FI system, that has 3 differnet maps 1 for no gas, 1 for 1 stage of gas and 1 for both stages. I did some home work and got ti running good enough to get in the trailer and over to the dyno shop..
First pull we made bike was PIG RICH.. new plugs did some tuning and kicked out some good numbers. But still very rich and we have yet to play with the timing.
next pull was even better only 2hp off the 300 mark on motor.. still pretty rich so we leaned out the fuel again and added 2 dergees of total timing.
next pull bike sounded like a pro stock drag bike until a little over 9K rpm when it want BANG shot a 7 foot long flame out the pipe and died..
We both knew it was not good.. NOT GOOD AT ALL.. our first assesment of how bad it was came when I pulled the #2 plug,and it was smashed.. I got a sick feeling in my tummy. Pulled the valve cover and saw the intake cam split in 2 pieces, one of the #2 intake valves missing and the retainer broken.
Seems the valve retainer broke, causing the cam shaft to brake sending the valve into the piston splitting it in 2 scaring the cylinder beyond repair and smashing what was left of the valve into the other 3 and destroying my combustion chamber.. No telling what else was damaged form the whole thing but I am not going to even look at the bike for a few weeks..
Over the past 2 years I have been building a race bike.. It is a 06 LE Busa. 1500cc, with some spray on it.. I spared no money building this. EVERYTHING was top shelf.
Yesterday was dyno day. Bike has a motec digital FI system, that has 3 differnet maps 1 for no gas, 1 for 1 stage of gas and 1 for both stages. I did some home work and got ti running good enough to get in the trailer and over to the dyno shop..
First pull we made bike was PIG RICH.. new plugs did some tuning and kicked out some good numbers. But still very rich and we have yet to play with the timing.
next pull was even better only 2hp off the 300 mark on motor.. still pretty rich so we leaned out the fuel again and added 2 dergees of total timing.
next pull bike sounded like a pro stock drag bike until a little over 9K rpm when it want BANG shot a 7 foot long flame out the pipe and died..
We both knew it was not good.. NOT GOOD AT ALL.. our first assesment of how bad it was came when I pulled the #2 plug,and it was smashed.. I got a sick feeling in my tummy. Pulled the valve cover and saw the intake cam split in 2 pieces, one of the #2 intake valves missing and the retainer broken.
Seems the valve retainer broke, causing the cam shaft to brake sending the valve into the piston splitting it in 2 scaring the cylinder beyond repair and smashing what was left of the valve into the other 3 and destroying my combustion chamber.. No telling what else was damaged form the whole thing but I am not going to even look at the bike for a few weeks..
sorry....
