Yamaha 25nmh V 25cv

[marlin1962]

can you guys tell me what is the difference between the 25nmh and the 25cv,i have the 25nmh and was asked about why i didn't buy the cv thanks.

[Chris 55]

From what I can find

CV series are lower compression than the Portable series

Portable series

YAMAHA 2 STROKE 25HP

Engine/Model 25NMH

O/M transom height (mm/inch) S 419/16.5

L 546/21.5

Weight (kg) S 48.0 L 49.5

Engine type 2-Cylinder

Displacement (cc) 395

Bore x stroke (mm) 67 x 56

Output (kw/hp) 18.4/25.0

Max. operating range (rpm) 5000-6000

Compression ratio 7.2

Scavenging Loop charging

Ignition CDI

Gear ratio 13:27 (2.08)

CV series

YAMAHA 25HP

Engine/Model 25VMH

O/M transom height (mm/inch) S 423/16.7

L 550/21.7

Weight (kg) S 52.0 L 53.5

Engine type 2-Cylinder

Displacement (cc) 496

Bore x stroke (mm) 72 x 61

Output (kw/hp) 18.4/25

Max. operating range (rpm) 4500-5500

Compression ratio 6.2

Scavenging Loop charging

Ignition CDI

Gear ratio 13:27 (2.08)

Chris

[marlin1962]

thanks chris for all the spec's, thats cleared up a few things.

[bluefin]

I was told that the larger displacement of the CV gives it more low down torque, the twin carbie in the nmh gives it smoother idle and acceleration. The cv is more a working motor suited to heavy loads.

Howard.

[newatthegame]

I was told that the larger displacement of the CV gives it more low down torque, the twin carbie in the nmh gives it smoother idle and acceleration. The cv is more a working motor suited to heavy loads.

Howard.

Hey guys

I own a CV and was looking to doing the servicing myself. Do you know where i can get services manuals or any info (handbook?) to help my out. I know a fair bit about car motors and would like to services the motor myself.

Thanks

[fishguts]

I was told that the larger displacement of the CV gives it more low down torque, the twin carbie in the nmh gives it smoother idle and acceleration. The cv is more a working motor suited to heavy loads.

Howard.

hi! i own a cv 30 and understand the idle biz, it has been a faultless engine so far having

done only 40 hrs although i have done a 50 service, just because! drawback is it takes a while

to warm up and occationally seems to run on one cylinder, sounds like it anyway when at trolling

speed but have been assured that this normal, maybe like you said this is because of single carby

other than that gets out of holes quick and hasn't let me down.. i say this because apparently

the 30 is just a jetted 25..just my blurb!

..cheers!..stevo!