Hi everyone,
I have a question regarding the residential V-twins used in the lawn tractors and residential ZTR's.
Back in the early 2000's my mom and her boyfriend at the time bought some land and wanted to build a new house. So the boyfriend bought a new Huskee (Tractor Supply) with a Briggs twin but not sure of the model.
I used the Huskee once or twice and it had such a good sound, at idle it made a BWAP-BWAP-BWAP... sound kind of like a Harley twin but not as harsh more throaty, steady and quieter.
So this year I decided to get a new LT for my mom's place (they never sold the old house, my childhood home and never built a new one and the boyfriend is no longer there). Anyway I decided on the new Cub XT2 Enduro with the Kohler 7000 KT725 "twin" (note the quotes, I'll explain).
So I got the machine and it performs well, tons of power and blows grass into the next township it seems but something didn't seem right, It doesn't sound like I thought it should, at idle it sounds much like the L-head singles I've used for the last 36 years but quieter.
When I got the tractor I downloaded the parts manual from the Cub site and they have the parts illustrations for both the Kohler and Kawasaki FR engines and I was surprised by what I saw.
For both engines the crank has only a single crankpin, both cylinders are in phase not 180 deg out as I expected. At first I thought the diagrams used a generic crankshaft drawing but the Kohler one shows two oil ports slightly offset by a few degrees from each other as one rod is "flipped" over relative to the other.
Now I don't know if both cylinders fire simultaneously or alternate every other cycle but I wonder if this is the reason why I don't get the impression of smoothness where a 180 degree crank would cancel itself out on firing but in these engines both cylinders push in the same direction on firing
In my research before buying the machine I'd read that twins are smoother and quieter but to me it seemed kind of the same as the old singles I'm used to.
But one thing I know is that I miss that BWAP-BWAP-BWAP...!
Anyone have any thoughts?
Thanx.
I have a question regarding the residential V-twins used in the lawn tractors and residential ZTR's.
Back in the early 2000's my mom and her boyfriend at the time bought some land and wanted to build a new house. So the boyfriend bought a new Huskee (Tractor Supply) with a Briggs twin but not sure of the model.
I used the Huskee once or twice and it had such a good sound, at idle it made a BWAP-BWAP-BWAP... sound kind of like a Harley twin but not as harsh more throaty, steady and quieter.
So this year I decided to get a new LT for my mom's place (they never sold the old house, my childhood home and never built a new one and the boyfriend is no longer there). Anyway I decided on the new Cub XT2 Enduro with the Kohler 7000 KT725 "twin" (note the quotes, I'll explain).
So I got the machine and it performs well, tons of power and blows grass into the next township it seems but something didn't seem right, It doesn't sound like I thought it should, at idle it sounds much like the L-head singles I've used for the last 36 years but quieter.
When I got the tractor I downloaded the parts manual from the Cub site and they have the parts illustrations for both the Kohler and Kawasaki FR engines and I was surprised by what I saw.
For both engines the crank has only a single crankpin, both cylinders are in phase not 180 deg out as I expected. At first I thought the diagrams used a generic crankshaft drawing but the Kohler one shows two oil ports slightly offset by a few degrees from each other as one rod is "flipped" over relative to the other.
Now I don't know if both cylinders fire simultaneously or alternate every other cycle but I wonder if this is the reason why I don't get the impression of smoothness where a 180 degree crank would cancel itself out on firing but in these engines both cylinders push in the same direction on firing
In my research before buying the machine I'd read that twins are smoother and quieter but to me it seemed kind of the same as the old singles I'm used to.
But one thing I know is that I miss that BWAP-BWAP-BWAP...!
Anyone have any thoughts?
Thanx.