1974 JD 400 Project

[Cdnturboz]

I actually found it at HomeDepot up here in Canada, a quick search looks like it's available down in the states too:

https://www.homedepot.com/p/3M-Safety-W ... /100391699

I was having trouble finding a grip tape that was wide enough and then found it, just traced what pieces I had of the old grips onto these and then cut them out. Yellow strip is "fairly" close to the yellow stripe on bumpers (a hair different but looks close enough for me)

Edit: Jep - just noticed your from Grand Forks, I'm fairly certain I actually bought a couple of these from Home Depot in Grand Forks one of the times I came down to go shopping in Fargo.

[Cdnturboz]

Think I got the carb all dialed in - idling about 2200rpm, high speed needle is about 1/2 to 3/4 out. No more major bog, plugs look brown which I think is a success.

[Cdnturboz]

Getting the sled ready for the CPTC vintage show this weekend - found a NOS bumper only a few miles away from me for a great deal. Needs a quick polish from sitting in a shed all these years but should make the sled look better .

[400brian]

Awesome to see it all coming together!

[Cdnturboz]

Update - bit the bullet and picked up a new Mikuni carb . Installed it today runs great everywhere but idle. Settled on a 210 main and 25 pilot. Will idle great for a few seconds then slowly dies.

[400brian]

I would suggest that the symptom you describe indicates that the engine is running out of fuel at idle. If you can't cure it by closing the airscrew a bit, then you may have to go to a larger pilot jet. That is assuming that you have adjusted the slide to give an acceptable idle rpm.

Remember that the air screw meters air not fuel. Closing it richens the idle mixture, opening leans it.

[Cdnturboz]

Thanks I’ll give it a try tonight and report back

[Cdnturboz]

Had some time to mess with it quick tonight - screwed the pilot screw to lightly seated and it runs great and will idle forever(previously had the screw out 1.5 turns)

Do I need to get a larger jet? Ie a #30?

[Cdnturboz]

Tried the larger pilot jet and got it to idle somewhat decent with .75 to 1 turn out.

[SS440-80]

Good work
I think that you could go up to #32,5.

[Cdnturboz]

Got it fully back together today, seems to run much better vs the Walbro or Bendix .

Been researching this for a while and never got a definitive answer. You ARE able to keep the factory glove box. Once cowling was back on i added a cheap 2 1/4” ID silicone 90 and tilted it slightly up so no gas/oil would run out if the carb ever spits some fuel back.

I had to mess with setting the choke and was able to actually remove the carb without removing the cowl which is a huge plus. (Just removed my silicone 90 first) I might look at adding a more ushaped silicone hose but will try this for now.

[400brian]

Good job!