Project My '87 Yamaha XT250 TS 57R

Just found this picture of the inside's for a WR250 muffler, i wonder if my pipe has been gutted then welded back together ?

 

So i've found some scrap steel to copy the above design
And just spent 10 minute's making this lot.
It should allow me to use just over 1/4 of packing between the perforated tube i made and the outer of the muffler

 

Here's a quick before video showing how loud it was





Bracket and perf tube now welded in




And the core all wrapped ready to assemble and refit

 

Thank's mate, but buying another muffler isn't really in my budget, even a used one atm

Muffler is back together and on the bike, i changed the tip for a slightly angled one, still need to paint it or give it a brushed finish again
Not sure how much quieter it is now though

 

Thank's
I just download that app to my Galaxy S6 and it read's 109db at 1500 rpm, when i take it to 3000rpm it read's 120db

Tried another app (with a 4.7 rating) and at 1500rpm it read's 89db, and at 3000 it read's 89db

 

The review's on the second app said it was pretty much spot on, but yeah i'm sure it's not 109db, it'd be closer to 90db or 95db
My horn is a Hella 100db @ 400Hz off a 2000 model Jaguar, and at 1500rpm the exhaust is no where near as loud as the horn

 

So the XT has been going pretty good lately beside's the noise.
But i have solved that issue now, i picked up a used WR muffler that was very cheap off gumtree and have modified that to suit the XT
Didn't need much to get it to work, just had to trim about 75mm off the front section, and reduce it down so it'd be a slip on fit to the XT header pipe.
I gave the front section a coat of black exhaust paint after i was finished modifyingand made up a small heat sheild to fill in the section between the side number plate and the tail light, the rear section i left standard/polished, it almost look's oem ?
The exhaust now sound's like it should, a fair bit quieter, it's slightly deeper but has a nice note to it, and at mid/higher rev's it isn't obnoxious anymore












The only other thing letting it down was a dirty (exterior) carby so i thought i'd take it off and clean it up with my bead blaster
While it was off i thought i'd check out the inside's too, wasn't too bad so i gave it a thorough blow out with the compressor with it stripped down
Nothing noticeable came out, i gave the jet's a good soak in Threebond then blew them out and reffited them
The carby body came up a lot better, and i blasted and repainted the cable linkage's and bracket's at the same time
Reassembled it started the bike and warmed it up and gave it a quick tune.
The YDIS Mikuni TK is a strange setup with it's twin throat vacuum secondary, but it work's well







I didn't get any pic's after it was blasted, but have some of it refitted

 

I picked up a pair of 80% Dunlop Trailmax tyre's for $20 for the XT yesterday and fitted them this morning
The new rear 120/80/18 has dropped the back down about an inch compared to the 120/100/18 that i had on there
And the front Bridgestone Gritty seemed to wander a lot at around 60km/h

 

I tried from 16 psi right up to 32 psi in 2 psi increment's, no difference

 

These Dunlops feel pretty smooth and grippy at 20psi with no wandering at all

 

The Bridgestone weren't directional , but the Dunlop's are.
The previous owner took the Bridgestones off his 2013 DRZ400 at 5000km's because he said he didn't like the way it rode with them from new (they're still soft too)
So maybe they did the same thing for him?

I spoke with a friend from the bike shop down the road and he said to try adjusting the pressure more or less to try and get 3 knobs contacting the road better, that didnt help.
And he also said some tyres are just like that, he's been riding dual sport bikes for 30 years as well and currently has an 86 TT250 he is doing up to use on the road with a bit of dirt on the weekends too.

The other weekend when i went riding and did a lot of offroad one guy had a late model 501cc Husaberg with motard wheels on it, his tyres are Hiedenau K73s and he had no problems at all in the slippery stuff or in the sand either but with it getting wetter he is thinking about getting a pair offroad 21/18 wheels and fitting a chunkier tread tyre with bigger blocks of tread similar to the Continetal TK60s
He's planning on some hillclimbs and being offroad more so will have 2 sets of wheels and be able to swap them to suit what he is doing

 

The XT has been sitting idle for the last 18month's so i have decided to sell it.
The battery had 4 Volt's in it and i've managed to get it back to 12.7 by boosting it up with a 12v 1 Amp charger for about 6 hour's, then put it on my CTek charger for a couple of day's

Front tyre was flat and the sidewall has cracked, i picked up a good secondhand tyre off the local motorbike tyre shop and swapped them over

The worst thing about the XT was the petrol tank, it was a bit rough with chip's, scratch's and some light surface rust underneath, i had only brush touched it with some enamel when i first bought it.
Took it of the other day and started cleaning it up
I used some Deoxidine on some 0000 steel wool and rubbed the rust off the underside easily enough (inside of the tank still look's new)
Removed the fuel tap and gave that a decent clean then etch primed the underside of the tank and gave it a couple of coat's of Dulux Vivid White from an aerosol, it's pretty much a perfect match to the original Yamaha White
Flipped the tank over and rubbed back the chip's and scratch's and a few spot's of surface rust
Today i masked the tank up and resprayed the top half.
Now i'm letting it dry then i'll scuff it back in a couple of day's and give it a couple of coat's of Isocyanate Free 2 pack clear over the whole tank including the sticker's and underside