1984 WR400 help

Post a pic!

Interesting thing about the spark arrestor that I could never figure.
Firefighting Experts in the USofA say that they have seen MANY fires started by bikes with no spark arrestors.
Here in Australia we don't have them and have never heard of a fire started by a bike.
Strange.
Probably a different type of bush .

politics...mainly I think. bikes were an easy target. although a spot of hot carbon on a bed of dried pine needles could be seen to be an issue....

muffler is set to arrive tuesday.... probably due to thanksgiving this week. dying to get it. fresh packing and paint awaits it.

getting a call back from halls cycle today on ordering headlight and tail light bulbs.

hoping to test ride next wednesday

here is the exhaust made from the original ends with an 80mm aluminium body and 25mm pipe.

nice...mine looks homemade... if I had a pic, I could show you....but I dont

I had to massage the ends and the tube as it was a very tight fit, its 6000 series seamless aluminium that i use for work 80mm,63mm,50mm and 40mm.its expensive but i get plenty of off cuts.

Muffler arrived today. It's s bit different. Got a little turbine looking end cap. I couldn't disassemble it to repack it. I think the baffle is welded on this one as well. Guess I'll just run it??

They seem to be quite different to the ones here in aus, is there access to get packing into it.you can buy the packing in a form similar to spaghetti but every exhaust i have ever looked at you could pull out the core and re wrap with sheets of packing.the second photo is what i was trying to describe as fix for your broken pipe.can the insert in the second photo be removed looks like the core should come out in the direction of flow.

Right, I can't pull the Swiss cheese pipe out in the direction of flow (or either direction for that matter). If you look at the first pic it looks to be almost welded in, in the same spot my old one did. But this is okay since the new one isn't broken. I just can't repack it. I have packing in hand ready to go though. Maybe I'll just run it for now and see how the bike goes. I should be test riding thursday

That looks the same as the one I have fitted to my old twin shock KLX250 (long story). The spring, complete with the small plate (with the 3 spot welds) should just lift out. It is probably a bit seized in there due to carbon build up and rust. Mine was a bitch to get out. Once that is out of the way you can hook out the packing material. The inner perforated tube stays in there and does not come out.

thanks grouty..... so that changes things if the tube doesnt come out. its certainly tough to pull on a sping to get that stuck plate out without deforming the spring!

Try twisting it as you pull. Or see if you can grip what is sticking out of the plate, as I guess it is stuck to the end of the tube with rust, old congealed oil and carbon.

so just so i know what to expect.... since ive ridden this bike many times without full power. what should i expect?? compared to say a newer style 125 2 stroke dirtbike?

i will. i sprayed it last night with penetrant so well see

Boy are you in for a pleasant surprise!

that's a California model with the spark arrestor in the end. I managed to break the welds on the inner section and remove the packing and perforated core and replace it with a full length pref tube.

it should go ok for you tho as that looks pretty clean.

if the bike is running clean and producing 80-90 % full rated power you should blow off any 450 four bangers about (just) my 400 level pegs the kato 500 four strokes.

so don't hop on and crack the throttle in the back yard or you will have a husky and rider shaped hole in the fence....

hahaha those were the responses i was hoping to hear. just making sure that the technology factor wouldnt come into play too much

or unpleasant