07 Ec 300 piston crossover

[wence]

G'day,
I was just wondering what crossover piston fits my Ec300?
I have read that a Tm (Vertex), piston will fit, also a wiseco.
Just wondering what is best and most reliable?
I am not sure of piston in it at the moment as I wasn't really interested in that when we were pulling it down(crank bearing seized).The bike is at a mates place so I will ring and check what is stamped on it.
I figure while it is down I may as well change the piston and rings also.
Any thing else I should do?
I did read last night while searching for crank bearing info that the reed spacer , if removed will give more top end?
Is this true and what are the pro's and cons to removing this?
Cheers Mark

 

[stainlesscycle]

reeed spacers lengthen intake tract and smooth the hit.

 

[wence]

Ok thanks,
I was just talking with my mate about it .
Glad you have cleared it up.
By the way Ichecked the piston and it has a W with anumber after it .I know it is aftermarket so I guess all I can do is find out what ths piston spec is and replace with the same?
Also , does anyone know what rod comes standard in the 300 motor from the factory?

Cheers Mark

 

[wence]

Anyone, anyone.....Bueller?

 

[gasmonkey]

W I think is a wossner.I've used both wossner and wisco.Both are good.Vertex is a cheaper option that came standard in 07.There are threads in here about year/piston combos.
Is the rod a honda oem?

 

[dank]

call your dealer, or gofasters, i would think they would know what the rod should be.

 

[Rick]

Here is an interesting read on a Husky 300 were they used a GasGas piston.

http://www.motocrossactionmag.com/M...RACE-HUSQVARNA-WR300-MOTOCROSS-BIKE-6887.aspx

 

[wence]

Cheers Guys,
Just got back from a week long ride.
Bike went well after a quick crank bearing swap and I will be pulling the piston in a weeks time to replace it.
One little question?
If we go from sea level to 1000m in height and also go from 15 degree celsius to 12 degree celsius(riding in thick fog and cold air).
What would you expect to do to change your jetting?
That is , would you expect to lean it off or richen it up?
Thanks again for the previous responses, and it is a woosner piston that I currently have.
Cheers Mark

 

[HuskyDude]

Less air = Less Fuel

 

[wence]

Yes , but doesn't a raise in air density(cold air and fog), do the opposite?
This was what we thought?
Therefore, if true, what out weighs what?
Cheers Mark

 

[widebear]

It all depends how close you were to start off with. All things being equal I would guess that at 1000 metres which is not alot, and givin the drop in temp and increased density due to the fog ,your bike may have actually run better?

 

[wence]

Widebear, normally I think this is the case.
Ok , now I am going to throw in another red herring.
When we pulled the motor down to fix the crank bearing w noticed that the previous people that rebuilt the motor actually put the reed spacer gasket in reversed which cut out about 5 to 8 mm off of one edge of the reed opening.
We worked out very roughly that this would reduce the size of the reeds opening by about 15 to 20 %.
The bike was jetted very well before the rebuild(maybe very slightly rich if anything).
What do you think this would do?
We reckon we know but would like you guys to reinforce our thinking.
Cheers Mark