Cheers brother 🤟

Thanks mate, yes I sure did plug the air box where the hot start ran. I found the stock carb pretty difficult to tune also.

Can you tell me the jetting?

Thats great to hear mate 👍

Did you use a wr400f jet kit

@@wearefarmersnot3875 no I got the jet kit for the 450 carb

Same mate, should be able to register it very soon. Just need the hot start lever and some mirrors 👍

The kx450f carb is the same for 06 to 2008 models. Only difference may be the jet sizes, which I ended up changing anyway. I blocked the hot start hole in the head with one of these screws. Click the link to see oemdirtbikeparts.com/product/dirt-bike-hot-start-plug-block-off-upgrade-titanium-carburetor-plastic-remove-kit/yamaha-1999-wr400f/ In the vid I show I blocked off the port to the cylinder and airbox with some rubber caps and zip ties to hold them in place. I also used the kx450 carb hot start set up I just ended up buying a hot start lever which I mounted on my bars.

I found this used carb on ebay for $180

I used a 2006 kx450f carburetor

The pilot jet is based on how many turns out your air fuel mixture screw is wound in or out. Fuel Screw adjustment should be between 1 to 3 turns out with optimal idle. If hour bike idles better with the fuel screw out more than 3 turns you need a larger pilot jet. If your bike does not cut off after the fuel screw is wound in past half a turn you need a smaller pilot jet.

I had my needle clip 3 from the top. The Needle clip position affects 1/4 throttle to 3/4 throttle. I believe the 42 pilot ran best. Make sure your idle adjustment screw is near all the way seated when you adjust the fuel mixture screw 1 1/2 turns out.

@@TheGingybeardMan ahh thank you I shall try it right away I watched the video and tried to to preset the screw

Auto decomp cam, makes the bike as easy to kick over as a two stroke. No effort required to kick it at all. I found it really tricky to start with the standard cam

@@TheGingybeardMan Cheers for the insanely quick reply. Also second question do you know how much work it is to do the swap. Can I rookie with patience and planning do it or am I best to see a mechanic?

@@TheNitrokitten mate it is a pretty technical job but there are loads of vids on KZfaq on how to swap out a cam.

@@TheGingybeardMan Cheers, I'll look around and see if reckon I can do it.

Thanks mate, sure does save alot of coin 👍

To old 4 that missile but respect! Bout time ya caught a 3 meter'y🍻👍

I purchased mine from mxstore.com.au but here's a link to one on ebay www.ebay.com.au/itm/NEW-YAMAHA-WR400F-YZ400F-1998-2000-HOTCAM-HOTCAMS-EXHAUST-CAM-AUTO-DECOMPRESSION-/223476926636?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=711-127632-2357-0

Mate it was that long ago I can't recall. It was the stock jetting from factory though.

I can't recall, but I know it's the stock size main jet from factory.

Thats a good question. I dnt know what cables will fit those Chinese carbs. I'd buy the carb 1st then see if the stock cables work. The stock cable wouldn't work with the kx450f carb though

Just took off the old carb and the throttle cables were toast, the new carb I ordered needed different cables so I just ordered some along with a new tube. I jetted the new carb to 168mj 45pj fuel screw at 1 and 3/4 hope it works

@@itzyaboooiii I'll be going with a 40 pilot jet. With the 42 the bike is tricky to start when cold unless the hot start is pulled in. This indicates the carb is running a tad rich and needs a smaller pilot jet to get it leaner.

Been a while since I put her back together and still cant get her to start, 42pj 170mj seemed to start and run but the fuel screw was almost in. I put in a 40pj and 155 mj and now she only burbles but no start. Also I may have messed up my idle adjustment and cant figure it out for the life of me, any ideas?

@@itzyaboooiii I found the 450 carb needs hot start when the engine is cold just to get it started. Give the hot start lever a go on initial start up. I have a 40 pilot in it and the fuel screw out 2 turns. Otherwise the bike idles great and pulls hard through all gears. The main jet size does not affect starting

I think it was a 168

2007 kx450f carb mate 👍 but any 2006 to 2008 450 carb will work.

@@TheGingybeardMan Thanks for the quick response mate. Will definitely be doing this to mine.

@@TheGingybeardMan what accelerator cable did u you use? My 98 wr400 has this terrible dead spot down low and I'd love to try the 450 carb maybe tune it a bit easier

@@puddinz9855 I had a lot of trouble trying to tune my stock carb. I used a kx450f accelerator cable to suit the carb. The 450 cable works with the stock accelerator tube