Kohler 7CM21-RV generator

[bobofthenorth]

Looking good Van.  Probably if you stand right next to that one and I park 200 yards away you'll hardly be able to hear mine as long as yours is running. 

[Van]

You guys are awesome thanks! I do have a question on the remote start panel, looks like only the start/stop leads were used (blk/red/brown), can any one tell me what the other 3 wires are used for ( blue/white /Green)? Is this to read voltage/indicator light ? is anyone using the stock kohler remote panel? The PO didn't have one so I guess I will have to construct one. I did manage to down load a PDF for the service manual and parts manual, so I am good there (thanks Billy!)

[luvrbus]

A Onan remote will work also check my shop there are several remotes for Onan's with the hour meter and there are several HWH slide switches in panels that will work they are neat they have a rocker switch and a key switch you could hook the fuel pump on the key but they are not hard to make just takes a momentary switch

good luck

[Bussman84]

Van the blue and white are for the hour meter greens not used. There is a install manual on line that shows wire diagram for hooking up remote switches I didn't get the original panel with mine either. When I bought mine and started the install I searched everywhere for the manuals online could find any info for the life of me, Had to buy them all from a kohler dealer (and had to pay way to much!!!!) just did a Google search and they all popped up..... Just my luck LOL

          Best of luck,   Billy

[Van]

Hah ha, I just found the install manual Ok Looking at the remote hook up schematic, that you are correct that the blue and white are for the hour meter and the indicator light, easy enough but now I'm currious what the green is for  back to the book

now comes the fun stuff, the muffler and y-pipe, or is there a dual inlet muffler available? How are you running yer exhaust? I'd hate to have to run dual muffers, more research is in order. thanks again!

[luvrbus]

The green is for the run light ground on the panel on mine what it grounds to the generator I have no idea

[Bussman84]

Van, mine came with the muffler and yes it is a dual inlet. Billy

[Van]

Thanks B! I have been scouring the internet for this muffler # 277726 no luck yet, might have to get creative

[luvrbus]

Van  if it helps they use a Nelson muffler

[James77MCI8]

Hello Van,

I wned one of these at one time. They are great units! You probably alreeady know this but this unit is strictly 120 volts. No 240 split phase unless it has been re-wired.

Best regards,

Rusty

[Bussman84]

Van, MPG Service Inc. Out of little rock seems to have quite a bit of knowledge on these units. I used them for my remote switches and manuals. You might give them a try for a replacement, I would guess they could at least get you heading in the right direction. They have a web site but not much for parts listing online more just company info. Thier number is 1-501-565-0009.

                Billy

[Len Silva]

I found this site:  http://www.rvmechanic.com/current_category.181/Forum.137483/offset.61/forum_thread_full.html

which led to this part:  http://www.northerntool.com/shop/tools/product_200381957_200381957?isSearch=169998

Does that help?

[Van]

Rusty, thank you, I did notice how the jumper connecting the 2 legs to the circuit breakers on the unit, I am curious on how (if possible) we might be able to work this. Our coach is wired for 30 amp temporarily at the moment, wiring for 50 was the initial goal, but was not feasible at the time. This will take some more careful research on my part as I am no electrician 
Billy, I will look into giving those folks a jingle too, thanks for the number, much appreciated!
Thanks Len! wore my fingers to the bone searching the web to no avail but did cross these posts at least a few times, but the fella eventually had a shop do the repair.
This Kohler unit has no Y-pipe in the mix, the 2 exhaust headers go straight down into a double inlet on the stock Kohler muffler which is great if I could find the exact replacement. The alternative is to fab up a two into one header, which will allow me my choice of muffler to bring this (as B.O.T.N would say) noise maker under control lol!
Clifford, I will look into Nelson and see if there is one available, if not fabbing a header will most likely be my best bet. The easiest alternative is just to run 2 separate mufflers out the backof the bus, heck at least I can make it look like I have an 8-V71 lol!

  Thanks Fella's but today I have to get back to the shop full of Hadley's, whose owners have agreed to throw all kinds of dough my way to fund my genny project lol!.

   Onward and upward

    Van

[luvrbus]

O boy a generator with chrome fish tails I can see this one coming lol the do sound cool with duals

good luck

[TomC]

I had a similar commercial Onan 6.5 with Vacuflo cooling where the air is sucked over the engine then blown out the bottom in my big rig truck (the Kohler pushes the air over then is vented out the bottom on either side).  Since the Kohler is a flathead engine, you'll have to decarbon it every so often-it tells you when it needs it-it starts to knock.  One way I kept the carbon built up to a minimum was to keep at least a 1500 watt load on it at all times-which in my case was simply running the block heater.

Find out what the ignition system is-on my Onan the points were a pain-and converted it to electronic.  Also, make sure you understand how to adjust the carb to lean it out when you're in high altitude.  Change the oil every 100 hours, and it will last many years-my first Onan had over 12,000 hours on it before it quit. When I did run the gen at night, I placed a box fan outside next to the exhaust pipe to blow the fumes away from the sleeper-course this is in a truck stop with close parking.  Only pain is using two fuels.  Personally like Diesels much better.  Good Luck, TomC