Tod74
02-03-2008, 03:55 AM
On speedtalk there is a thread about stupid mistakes people have done or seen. This is a copy paste from that thread. :D
From usernet - rec.crafts.metalworking
Subject: Extrude-hone gone wrong!!!!
A friend sent me this post from a personal watercraft tech chat site. If
this guy is for real he should make Darwins list;
Porting trouble
--------------------------------------------------------------------------------
Hey guys, I've got a 93 Superjet. I've had a pipe and modded ignition for a while and wanted to get more performance. I was recommended to port and polish the intake and exhaust ports. We found out they used abrasive material to do it like gritty sand. So I got with my friend that tunes Fords and we decided to try it ourselves. We got a bag of sandblasting sand and hooked up into the intake and started the ski with it hooked up to the flush kit. We had to hold the gas so it would run. He wanted to let the engine suck in the sand through the intake so it would port it out and then push it out the ehxaust so it would port the exhaust port and manifold.
I was worried that it might cause problems but he figured it'd be OK as long as we added a little more premix than usual. After running it and letting it suck in sand we got about quarter way through a 25 lb bag. The engine was bucking and kicking and sounding really weird. We stopped and hooked the F/A back up normal and took off the sand supply. We tried to start it again and it was really hard. Once started it couldn't idle and kept making weird noises. We just kept trying to run it to blow more sand out but it started to make scraping and knocking noises.
Help! Can anyone tell me what to do! My buddy only does Fords so he doesn't
know much about Yamaha pwc motors.
__________________
650 Superjet
From usernet - rec.crafts.metalworking
Subject: Extrude-hone gone wrong!!!!
A friend sent me this post from a personal watercraft tech chat site. If
this guy is for real he should make Darwins list;
Porting trouble
--------------------------------------------------------------------------------
Hey guys, I've got a 93 Superjet. I've had a pipe and modded ignition for a while and wanted to get more performance. I was recommended to port and polish the intake and exhaust ports. We found out they used abrasive material to do it like gritty sand. So I got with my friend that tunes Fords and we decided to try it ourselves. We got a bag of sandblasting sand and hooked up into the intake and started the ski with it hooked up to the flush kit. We had to hold the gas so it would run. He wanted to let the engine suck in the sand through the intake so it would port it out and then push it out the ehxaust so it would port the exhaust port and manifold.
I was worried that it might cause problems but he figured it'd be OK as long as we added a little more premix than usual. After running it and letting it suck in sand we got about quarter way through a 25 lb bag. The engine was bucking and kicking and sounding really weird. We stopped and hooked the F/A back up normal and took off the sand supply. We tried to start it again and it was really hard. Once started it couldn't idle and kept making weird noises. We just kept trying to run it to blow more sand out but it started to make scraping and knocking noises.
Help! Can anyone tell me what to do! My buddy only does Fords so he doesn't
know much about Yamaha pwc motors.
__________________
650 Superjet