312-8 repower

[Handy Don 12,088]

5 hours ago, Red-Bovine said:

Here are pictures of the Honda muffler.

Those pesky mufflers always seem to be in the way, don’t they? 

[RED-Z06 2,213]

3 hours ago, CCW said:

@Red-Bovine Thanks for the info.  For now I will stick with the one provided.  Although you did a great job cutting the hood I just do not want to do that.  I might try to indent the bottom of the muffler.

 

I couldn't cut up a nice hood.  Ive extended a few twin mufflers out a few inches on swaps/repowers, even flipped a muffler over to get clearance on one

[CCW 1,291]

21 minutes ago, RED-Z06 said:

 even flipped a muffler over to get clearance on one

 

Tried to flip the new muffler but the mounting brackets are angled forcing the installation in only one direction.

[Red-Bovine 309]

I was looking for functionality, not a collector showpiece. Since I already abandoned the Onan engine for the Honda, a little mod to the hood didn't hurt my collector status.

[davem1111 2,027]

20 hours ago, ebinmaine said:

@CCW

 

Ya could mount up a couple 3 foot tall chrome stacks!!!

 

 

 

Here's what mine looked like when I got it:

 

 

Here's what it looks like now - planning to do some more body work on the hood, repaint and get new decals.  Chrome stack(s) were not in the budget, maybe in the future.

 

[RED-Z06 2,213]

16 minutes ago, davem1111 said:

 

Here's what mine looked like when I got it:

 

 

Here's what it looks like now - planning to do some more body work on the hood, repaint and get new decals.  Chrome stack(s) were not in the budget, maybe in the future.

 

Careful turning the pto on 🫠

[davem1111 2,027]

5 hours ago, RED-Z06 said:

Careful turning the pto on 🫠

 

Hah!  Yeah, the PO/repower installer had put a metal shield on the header pipe close to the PTO handle. I need to do this again - I've burned my hand at least once. 

[ebinmaine 67,131]

15 minutes ago, davem1111 said:

 

Hah!  Yeah, the PO/repower installer had put a metal shield on the header pipe close to the PTO handle. I need to do this again - I've burned my hand at least once. 

Header tape

[Red-Bovine 309]

Here is our 520H with the Honda GX630 Repower Blowing 6-7" of wet snow this morning. 44"  two stage blower.

[Tonytoro416 1,030]

10 hours ago, Red-Bovine said:

Here is our 520H with the Honda GX630 Repower Blowing 6-7" of wet snow this morning. 44"  two stage blower.

We just got in a new John Deere welder/generator unit at work and it has a GX690 Honda on it.  I haven’t looked at it too close though I keep my distance because it would be hard for me to not start unbolting her to come home with me lol 

[CCW 1,291]

My project is on hold till mid February.  Currently sitting with my granddaughters in Katy, Texas (Houston area) until January 28th and then off to Isle of Palms, SC.  Back home early February.  Hopefully the really cold weather will be finished and I can then complete the engine swap.

 

[CCW 1,291]

@davem1111 Which wire was use to connect the fuel solenoid?  

[davem1111 2,027]

6 minutes ago, CCW said:

@davem1111 Which wire was use to connect the fuel solenoid?  

 

I will take a look in a while, but I think what the PO or whoever did the repower on mine did was added a toggle switch in the dash, which just goes to either an "always hot" connection or to the ignition switch to a lead that goes hot when the key is turned on.  Before I cut off the pin in the solenoid, I had to remember to toggle that switch on or would get no fuel into the carb. If I remember correctly, the solenoid only has one wire that provides 12v to the solenoid and it is grounded to the carb by just being screwed into it.

[CCW 1,291]

@davem1111 Thanks.  I will be on the phone with Repower tech support for a work around.

 

[davem1111 2,027]

8 minutes ago, CCW said:

@davem1111 Thanks.  I will be on the phone with Repower tech support for a work around.

 

 

Hope they can help or were helpful.

 

I took a picture - the red wire coming into this toggle switch is the wire from the solenoid. It comes out of the solenoid black or gray, hard to tell without some cleanup (which is sorely needed and I haven't gotten around to yet), then turns to red at a junction. The green wire pretty obviously goes right to the positive terminal on the battery.  To me it makes the most sense to tap into a wire that goes hot when the key is turned on, removing the need for a toggle switch.

 

 

Oh, and I almost forgot to mention, the toggle switch that's toward the bottom of the picture close to the choke is some kind of kill switch for this engine. I haven't taken the time to figure out where that goes on the engine, but it has to be flicked to "on" for the engine to run, and off to stop it even if I turn off the key. Another poor choice, in my mind.

Edited February 12 by davem1111

[CCW 1,291]

@davem1111 Thanks This is helpful and I will be calling tech support today.

[Red-Bovine 309]

I don't recall having to wire up the fuel cutoff solenoid. I thought it was wired into the main engine wiring and energized by the ignition switch with the coil. My diagram shows it to be a BUY wire which should be a Blue/Yellow wire. I honestly don't recall. Here are some pics of the wiring harnesses.

[RED-Z06 2,213]

29 minutes ago, Red-Bovine said:

I don't recall having to wire up the fuel cutoff solenoid. I thought it was wired into the main engine wiring and energized by the ignition switch with the coil. My diagram shows it to be a BUY wire which should be a Blue/Yellow wire. I honestly don't recall. Here are some pics of the wiring harnesses.

The majority of breakerless ignition systems dont apply power for ignition, the coils spark purely by the flywheel magnet passing below the legs of the coils, and the harness applies ground to stop spark.

[Red-Bovine 309]

On the 520H that we repowered, the coil does appear to be powered by the ignition switch and the feed to it appears to be disrupted by a kill relay and PTO and seat switches. A tap off the ignition or accessory circuit should power the fuel cutoff.

[RED-Z06 2,213]

7 minutes ago, Red-Bovine said:

On the 520H that we repowered, the coil does appear to be powered by the ignition switch and the feed to it appears to be disrupted by a kill relay and PTO and seat switches. A tap off the ignition or accessory circuit should power the fuel cutoff.

Yes, P Onans used a weird breakerless 12v coil like used on the Points B Onans, it used a hall effect pickup to trigger the spark.  It applies 12v to the coil for power.  The Honda however, will instantly torch both coils if any power is applied to the kill harness.  

[Red-Bovine 309]

I'm not sure how the Honda  coils are internally wired, but I didn't do anything special when I wired up mine. I just hooked up the wires per the Repower instructions. My Honda schematic shows the coils being fed off the IGN terminal on the Ignition switch, which would indicate that they are energized by the ignition switch and not grounded like a typical magneto. This would be as the Onan was wired.

Edited February 12 by Red-Bovine

[Red-Bovine 309]

Here is the Honda schematic.

 

 

Edited February 12 by Red-Bovine

[CCW 1,291]

I spoke with tech support and they have a work around wiring harness they are sending to me at no charge.  Should have it in a couple of days and update again.

 

[Red-Bovine 309]

sorry about the resolution on my scan I don't seem to be able to get a good scan to upload. Glad that you are able to get this resolved. Hopefully.

[CCW 1,291]

A quick update on repowering.  Today I finally fired up the engine.  Once I get some more done and hopefully finish the job over the next two weeks I will create a final thread on the project.