head problems for 94 suzuki RM125

[bayourm125]

My bike went under for hurricane katrina, but seems to have good compression and spark. im looking to buy new head.What i need to know is, can i use my same weisco piston when i buy a new head or will i need to buy a special size?

 

[MOTOX888]

If you are buying the stock head and not doing any modifications to it, then you will not have to buy a special piston. If you are buying a high compression head, or you are buying the stock head and then making it a high comp. head by milling down the gasket surface so it comes closer to the piston when it is at top dead center, then i would look at getting a special piston from weisco just to be on the safe side. A high compression motor will be harder on the piston, and you will need to look at running at least a 50/50 blend of racing fuel and premium to keep detonation levels down so you dont break the electrode off of the spark plug, ruining your motor, and causing you a a big bite in the wallet.

 

[bayourm125]

it would be a stock head. nothing race.When i went to price new head, they said it would come bare,would i be able to take parts off old head and replace?

 

[RM_guy]

There is nothing on the head that comes off. I'm not sure what they are talking about when they say it will come bare.

 

[bayourm125]

im talking bout the suzuki ATEV and the springs.

 

[MOTOX888]

If they mean only the head and not the gasket....then u will ned to order a head gasket too......and you probobly will want to buy a new spark plug, thats probobly it.
If the bike was underwater, then i would look at the wheel bearings steering head bearings and etc. to be safe

 

[RM_guy]

im talking bout the suzuki ATEV and the springs.

I assume that's the exhaust valve. It is part of the cylinder, not the head.
Here's a good picture

click here

 

[bayourm125]

thats it,,the cylinder i meant. by looking at the prices im starting to second guess this bulid.

 

[RM_guy]

Can I ask why you are replacing the cylinder if it was just under water? Bikes get drowned all the time and come back to life with some TLC.

 

[dklink2000]

If it went under from flooding, then I have to assume it wasn't running at the time. Just replace all of the fluids and see if it still runs. I would be more worried about the electrical system.

 

[bayourm125]

when i put the spark plug on the coil outside the cylinder it has a spark. no it wasnt running but when i drained it and put a new spark plug it it wouldnt kick over but when it did it sounded like a firecracker went off in the muffler and a lil smoke would come out like it wanted to fire. the muffler was rusting so i went to take it off to see the extent of the damage, i never saw a muffler held on without the 2 lil screw holding it on it was just pushed into the cylinder and when i was trying to take it off the seat it was in broke off around the edge, thats y i need a new cylinder. the electrical system seems fine if i get spark?

 

[bayourm125]

no, it wasnt running atthe time,, it has spark, so i assume electrical is ok. answer to rmguy, when i went to take off rusty exhaust the metal around the exhaust on the cylinder broke off,,doesnt it take 2 screws to hold an exhaust on?

 

[RM_guy]

The pipe is supose to be held on with 2 extension springs. Sounds like someone added the screws. You can get the cylinder welded to add tabs to attach springs to. Here's a picture of how the pipe attaches: <click here>

 

[bayourm125]

ok,,it was missing one of the springs, and when i went to get it out of cylinder it was froze and i had to manhandle it to get it out and broke off piece of cylinder in process. i have the cylinder off right now and i have a face cloth over it. my question is how long can i keep it off before the lower end starts to rust, or what can i do to prolong it till i get a new cylinder?

 

[TimberPig]

If you have the piece that broke off, you should be able to take it to a good welder and have it welded for much less than the cost of a new or used cylinder. To prevent rust in the bottom end, get any and all water out, and douse the crank and bearings with 2 stroke oil. If it was submerged and water got in there and sat in there however, there may already be rust damage to the bottom end.

 

[RM_guy]

You can douse the lower end in WD-40 to displace any water but as the Pig said if it's already rusted you have more problems...IE. replacing the bearings. I buy WD-40 by the gallon and spray everything that can rust everytime I wash it to keep the rust at bay.