pwr. diff between 6m6 and 61x cases

[sflsurfrider]

i know that the reeds are bigger on 61x cases, thus forth allowing a larger charge, but are the power gains noticable? this is on wifey's freestyle ported 61x cylinder, b-piped, 180 psi engine, msd enhancer, single 44mm (soon to be 48mm..... maybe) on a stock manifold and vforce reeds.

tankya in advance!

 

[Mouthfulloflake]

I asked the EXACT same question on pwcyesterday a while back, Ill try and find the thread to reference.

the consensus was that it was a noticeable improvement.

 

[Mouthfulloflake]

found it!

http://www.pwctoday.com/showthread.php?t=46632&page=7&highlight=porting

 

[romack991]

i was under the impression that you could only get vforce reeds for 62t. guess i was thinking wrong.

 

[runaway]

vforce's are only for 62t. You can do Carbon Tecs or Boysens for the 61x cases.

 

[sflsurfrider]

cabon tecs... my bad... i always confuse them

 

[Freestyleriverrat]

Here is a comparison I did back in the fall between the 6m6, 61x and 62t reed valve sizes. http://www.pwctoday.com/showthread.php?t=59485&highlight=6m6+comparison

 

[sflsurfrider]

Here is a comparison I did back in the fall between the 6m6, 61x and 62t reed valve sizes. http://www.pwctoday.com/showthread.php?t=59485&highlight=6m6+comparison

itd be great if you didnt have to log in to sbttoday to view them (im banned). but, i do remember the thread and i have all 3 different types of reeds laying around and yes, big difference between them all.

 

[Freestyleriverrat]

Here ya go.........

I am going from a 6m6 to a 701 in my ski and thought that the 6m6 and 61x had the same everything but different cylinders. I currently have all 3 sets of reed cages at my disposal so i thought I would document the size differences of the reed cages between the different motors. For the record the 6m6 cages and manifold will not bolt up to the 61x cases. They look the same but are completely different, the pics should illustrate why.

The first pic is of a 6m6 cage on to and me holding a 61x cage.
Second pic is a 62t cage on top and 61x on bottom
Third pic is 6m6 on bottom, 61x in middle and 62t on top

Hope these pics help everyone planning a motor swap visualize the size difference with different motors and the potential limitations the motor will have on the intake side.

 

[waxhead]

yamaha is a very conserative companyif they change them to get more power you can be sure there is a good gain or the engine needs it

 

[2nd nature]

i heard the only after market reeds for the 61x cases that works better then oem was the boysen power reeds. i maybe wrong.

 

[waxhead]

thats the same as i have heard as well

 

[sflsurfrider]

are stock 61x reeds stainless?

 

[waxhead]

yes
sure are

 

[sflsurfrider]

then ANYTHING is better

 

[waxhead]

carbon tech arent that much better but they are a bit
i would rather buy a set of 62t cages and cases and do it right

 

[sflsurfrider]

carbon tech arent that much better but they are a bit
i would rather buy a set of 62t cages and do it right

cages or cases??

 

[waxhead]

both
fixed it

 

[sflsurfrider]

i have 62t cases for my boat. this thread isnt about my boat. in fact i do have a set of 62t's on the shelf.... just in "case". LOL

 

[waxhead]

your wifes boat will go alot better as well with 62t cases and cages