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Guest
Guest
Aaaah ok, sounds like there's a reason then 
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400, 425, 450? Which one is the best? Why?
- Thread starter tkent02
- Start date
I was toying with the idea of building something like this... http://www.rycamotors.com
Problem is that I'd have to lose one of my other bikes to do it
Problem is that I'd have to lose one of my other bikes to do it
B
BentRod
Guest
I will get back to you guys about the reliability of the gs400 engine. it can be broken. I have rebuilt two of them now. the pictures that will follow are not for the faint of heart...
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BentRod
Guest
we will start easy. I want to state that I always kept my bikes well tuned and timed by either myself or my mechanic. I buy my bikes and engines used, so I cannot speak the to treatment and care given by PO
Valve wear. both of these are intake valves.Both came out of the first engine i rebuilt, and the left one is still in usable condition. the one on the right has been badly scorched. remember this is an intake valve. you can see the ring of badly burned metal where the flow of hot gas went from laminar flow to turbulent just above the valve head.
next, pitted piston. this came from my second engine. I was running lean to get a little more power. Also the extra hot engine heats up the tank quite a bit and helps with the chilly spring morning ride to work. These marks are the result of the heat burning through the carbon layer, and hitting the aluminum. when the heat breaks through the carbon the material is to hot that when it hits the aluminum a bit of metal instantly melts, and spits off. The pitting eventually caused pre-ignition and knocking.
Smacked valves. the evidence can be seen by the marks on the intake side of this piston. Also notice the damage around the edges. This piston came from my first engine.
Better view from the side shows the extent of the damage, and burn marks down the side are evidence of blow by of burning gas past the piston rings. burning off the oil this would have removed any protection for the cylinder walls, now being scored by the damaged piston.
Valve wear. both of these are intake valves.Both came out of the first engine i rebuilt, and the left one is still in usable condition. the one on the right has been badly scorched. remember this is an intake valve. you can see the ring of badly burned metal where the flow of hot gas went from laminar flow to turbulent just above the valve head.
next, pitted piston. this came from my second engine. I was running lean to get a little more power. Also the extra hot engine heats up the tank quite a bit and helps with the chilly spring morning ride to work. These marks are the result of the heat burning through the carbon layer, and hitting the aluminum. when the heat breaks through the carbon the material is to hot that when it hits the aluminum a bit of metal instantly melts, and spits off. The pitting eventually caused pre-ignition and knocking.
Smacked valves. the evidence can be seen by the marks on the intake side of this piston. Also notice the damage around the edges. This piston came from my first engine.
Better view from the side shows the extent of the damage, and burn marks down the side are evidence of blow by of burning gas past the piston rings. burning off the oil this would have removed any protection for the cylinder walls, now being scored by the damaged piston.
S
SVSooke
Guest
True to what I think are the best small Suzi's I bought my wife one of these for her first bike
85 or6 GS400,think it's a 86 with a build date of 10/85.
85 or6 GS400,think it's a 86 with a build date of 10/85.
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B
BentRod
Guest
now the really scary stuff
This is the exhaust cam from my first destroyed engine. the came shaft went halfway through a corner on the highway. bits and pieces of tappet and rocker went down the engine into the gears and locked up my rear wheel. the rear started bouncing like mad. I hit the front brakes hard and brought it over to the side of the road. once i got close to the guard rail i just jumped off, still doing almost 40km/h. I hit the down hill slope of the ditch and tumbled. ATGATT, so I came out of it ok. the bike had kept rolling down the shoulder and came to a stop leaning against the guard rail, pretty busted up but upright.
note the extensive cam wear. The rocker and the cam were worn well past tolerence. the rocker snapped off and jammed the cam shaft, breaking it.
one more note on the piston heads from earlier. Take a look at the shap of the hole that the wrist pins go in. the burnt one isn't right.
and this is the wrist pin that came out of it
note the melted center. this pin was welded to the connecting rod.
This is the exhaust cam from my first destroyed engine. the came shaft went halfway through a corner on the highway. bits and pieces of tappet and rocker went down the engine into the gears and locked up my rear wheel. the rear started bouncing like mad. I hit the front brakes hard and brought it over to the side of the road. once i got close to the guard rail i just jumped off, still doing almost 40km/h. I hit the down hill slope of the ditch and tumbled. ATGATT, so I came out of it ok. the bike had kept rolling down the shoulder and came to a stop leaning against the guard rail, pretty busted up but upright.
note the extensive cam wear. The rocker and the cam were worn well past tolerence. the rocker snapped off and jammed the cam shaft, breaking it.
one more note on the piston heads from earlier. Take a look at the shap of the hole that the wrist pins go in. the burnt one isn't right.
and this is the wrist pin that came out of it
note the melted center. this pin was welded to the connecting rod.
