PROBLEMS on the top end

[fun_on_the_sand]

Hey guys. I think I have a big problem here. I just did the top end on my banshee, ported the cylinders, bored hem to 66mm, and put a pro design cool head with 18cc domes. When I start the bike there is this "toc" sound, kinda if the pistons were hiting the head. but I opened the top end and there is rust on one of the cylinders, but there is no sign that show that the pistons are hitting the head. The gasket I used on the cylinders-crakc case are cometic, and do not have the silicon strip the the YAMAHA have...

 

Any ideas???

[batoutofshell]

sounds like detonation what kind of fuel did you put in ( octane)

[fun_on_the_sand]

sounds like detonation what kind of fuel did you put in ( octane)

508546[/snapback]

 

C-12

 

if it was detonation, would I still hear the explosion with the spark?

[batoutofshell]

not sure how loud your pipes are,since you good fuel my book says poss timing advanced too far

[fun_on_the_sand]

not sure how loud your pipes are,since you good fuel my book says poss timing advanced too far

508554[/snapback]

 

I have the CDI box from DYNATech and that is supposed to change the timming, but it does it from 4000 rpm's up, and this sound is during idle.

 

What else can change the timming?

[batoutofshell]

is there any work in the stator area done, smoking?-color of smoke

Edited April 27, 2006 by batoutofshell

[fun_on_the_sand]

is there any work in the stator area done

508561[/snapback]

 

Nothing at all

[batoutofshell]

try pulling the head again and rubbing some oil where the rust is how did that get in there was it raining or humid when you put it together was it aolt of time till you fired it up and noticed the rust

[fun_on_the_sand]

try pulling the head again and rubbing some oil where the rust is how did that get in there was it raining or humid when you put it together was it aolt of time till you fired it up and noticed the rust

508563[/snapback]

 

 

I live on Phoenix Az, so I don't think humidity may be a problem. Las time I run it was monday, and I opened today and found out the rust.

 

I think maybe the sound comes from the head (loose seal) and water is comming inside the cylinder from the head. But I don't know what to look for to make sure that is happening

[batoutofshell]

my next idea would to replace the head gasket was the one you put in metal

[fun_on_the_sand]

my next idea would to replace the head gasket was the one you put in metal

508571[/snapback]

 

I am using a cool head from pro design. It uses o-rings

[batoutofshell]

thats right maybe one got pinched or not fitting correctly

[fun_on_the_sand]

thats right   maybe one got pinched or not fitting correctly

508575[/snapback]

 

 

Tomorrow I'll try to put that head back. If stil makes that sound I am going back to the stock head. Although I am afraid that since the piston is +2mm it may hit the head bad. what do you think?

[batoutofshell]

did you do all the work yourself did the correct parts go in rods, crank, to match the pistons. Not trying to sat anything by all means just checking I always use a list so I don't fuck my shit up.

[fun_on_the_sand]

did you do all the work yourself did the correct parts go in rods, crank, to match the pistons. Not trying to sat anything by all means just checking I always use a list so I don't fuck my shit up.

508583[/snapback]

 

 

I did it my self. The pistons are brand new, and so are the bearings and wristpins. I am not sure what you mean by using a list. Before assembly I check all the play on the bearing, cranckshaft and wristpin, and everithing was fine.