New Project - 1986 WR400

From Scoott back in 2010 under '86 WR400 Review':

To get more mid to top, install a v-force. To reduce/ eliminate vibration( and yes they all vibrated) go to a 87-88 spec rod.

Cheapest option I'm aware of:
http://www.husqvarna-parts.com/catalog/item/3736880/4507747.htm

Of course, they say they're back ordered. Here's another option:
https://www.dcvmx.com/xcart/product.php?productid=187022&cat=651&page=1

sudco will get you a manifold at a good price

I think he is talking about the radiator mounts.

No do not use rubber to mount the engine.They are for the radiator.

87-88 rod is just "girdered" in design not really much more then that for reducing vibration. key is a dead on trued up crack to withing .0005 .

in addition to the crank, the 400/430 really smooth up with correct jetting too. the bottom and mid is so rich stock.

the radiator isolastic mounts can be found at some old school Husky dealers
there are also common to some European cars from the era
if you can't find a manifold by next weekend , pretty sure I have one of the UpTite ones in a tub of spares

If you get a chance to take a look, please let me know. My pace of progress will be slow. I may coat the one I have with silicone to avoid an air leek when I get to attempting to start the bike. Thanks,

silicone is ok to start it but would not trust it as a rider

my manifold had a hidden split underneath when i first got it going and I didn't find out until I pulled a big wheelie and dropped it back down hard and it gave a huge ping and an mini over rev. tried again..same result?? started looking and found the split. lucky not to have done serious damage

does this bike have the giant rubber manifold or the two piece metal/spigot mount? if its the former, it needs upgraded to the latter. sometimes they are on ebay cheaply, especially for the single shock bikes. ss bikes are canted to the side a bit, dual shock are straight.

Here is a pic of mine. I'd say this is the giant rubber manifold. If you have a photo of the metal/spigot mount, please post.

I used these for all my SS 2 strokes
http://www.husqvarna-parts.com/catalog/item/3736880/4507747.htm

where do you find them on eBay cheap?

yup thats the big one piece. the one 400xc linked to is a great upgrade as you just replace the cheap easily obtained mikuni spigot down the road when needed. they are available used if you look, as i see phil is out..

they pop up on parts bikes, time to time, for around 25-50 bucks, usually with a rotten mount attached to them. like i said, you just have to watch if its straight or canted.

Also works with V-force reeds

I see this is the two piece manifold.

yup, the rubber piece is only 20 some dollars to replace once you have the alum piece