[Bruce CurtisMember]

Moto wrote:

Quote:

Mr Blue wrote:

Quote:

Gas Gas 300 won’t smoke a 450, and the new KTM300s are probably not quite as quick as a CRF450F in a drag, but believe me the TM300 and Husky WR300 rocket ships ain’t for the faint hearted, they are quicker than mine by a fair margin and I hold a well tuned CRF450F to 90-95 on the tar with a good rider, yet both of those 300s smoke me in straight line.

read here what Barry A said in a test review about the YZWR alone

http://www.bikepoint.com.au/reviews/2004/motocross/yamaha/yz250wr/yamaha-yz250wrn-14138

BC

There is video proof on this site of me taking down a TM300 The same TM300 that beat the new WR300.

As LC4 was there watching it, he can verify it was done with a gumby like me aboard too

And somewhere in Bows archives is video proof of my 250/2t smoking a YZF450 a WR450 and Bows’ race prepped CRF450F on a gravel road, our points are the same the rider is 90% of the ride, but having ridden all bar the Husky I know which are fastest between the trees and around them in my hands…it ain’t the 450s unless we are on big open firetrails, even then whoever can hold it wide and keep cornerspeed up for longest is the winner.

within reason the bike is a moot point

Bc

[Bruce CurtisMember]

I’m in the same camp as T/B on these, I get on bikes without p/Pegz and think “what is the problem with this thing”, IF i ever get another bike this will be second on the list after suspension mods, in fact IF I ever got aqnother off-road bike it now has to be a Yamaha just so my pegs can fit onto it…. .

BTW T/B I just spray lithium grease into mine froma pressure pack, they still pivot flawlessly, even after becoming completely obliterated in clay on the weekend.

And Shiny shiny pretty looking too.

BC

[Bruce CurtisMember]

Trailboss wrote:

Quote:

And the cost?

TB

I’ll have to weigh that up when the lads tell me I guess T/B, if it’s reasonable and a DIY fix I’ll be all for it.
if not I’ll have to think about alternative methods
BC

[Bruce CurtisMember]

Axel I have run out of fixes nad many smokers have these issues, it is why we have liquid cooling in the first place, equalising the temperatures around the power unit. Inside the chamber i have a reasonably good flame spread, while squish is not perfect, it is good enough to not warranted CCing the head yet, the underside of the piston crown has the glorious 10cent piece caramel mark, but and a big but, I have experienced mild detonation, but infrequently and it quickly disappears i put this down to dead fuel or more likely this hotspotting. Now i reckon I know exactly what Rat and Bull are on about, but again I don’t know the fix…they do. It’s like the rotaries we used to race, we would plumb extra oil lines in to extract oil and cool it before it hit the known hot spots and reroute it back into those areas, a bit messy but we gained sustainable HP and the engines lasted longer. But they were easy as they ran twin oil pumps and the housings run alternate oil and water galleries.

I will be highly interested once the boys give me the go-ahead to get this done.

BC

[Bruce CurtisMember]

Ok tinkerer here (fiddler even:dry: ).

At medium to normal slow pace I have a bike that to quote a dyed in the wool 4T freak is “the perfect 2 stroke for hillclimbing” it has oodles of grunt down low, with absolute instantaneous throttle response until……….I get into nasty overgrown clutch riding snotty S/T, it doesn’t fuel up (I have been around long enough to know when a bike has jetting or burn issues)but loses the lugability. Now the radiator doesn’t boil, but the bike reacts like it is overheating, which i belieev it is…somewhere in the combustion area is not getting the heat texchange it should be and as a result the power is suffering. Now these are the tracks where I need lowend response the most, cause with a handful of revs to aviod stalling and clutchwork misjudged you launch into the trees and undergrowth all too quickly.

BC

[Bruce CurtisMember]

Ok so far this is very sound, internal combustion dynamics 101, 90-95% of your potential energy is lost into heat, either through exhaust or inefficiencies in the cooling system. Which is why machines have localised failures due to “hotspots” as i call them. If you blokes have worked out a way to overcome some of this, you probably should get your asses into gear and patent it (after you help us of course:laugh: 0 and reap the fruits of your labours.

BC

[Bruce CurtisMember]

Maybe header is a mismatch or has taken a hit Fossil?, although that would be fairly obvious.

sounds like one that got past QA in the factory.

BC

[Bruce CurtisMember]

this answers my question in the other thread Moto, sounds like you had a good time, and why the hell not. But you missed the actual “ride” report, was it a two stroke or a four stroke?

Bruce

[Bruce CurtisMember]

Moto wrote:

Quote:

She’s been good about the travelling and deserves some reward

So you stay in Singapore and let her go to Paris, that’d be a hell reward.

BTW what did you do your dough on in Rio? those boys do look like real girls don’t they

Bruce.

[Bruce CurtisMember]

So is Bull been about yet to answer our qweeries:P

most interested in this modification while I’ve got the weerzard in bits this week.

bruce

[Bruce CurtisMember]

Can’t say for sure, apparently the rabbit fence wasn’t too bad according to some Grevillia local riders and we did come across a QLD group on mostly KTMs a while back that had ridden from Edinburough through to Unumgar and over to Tooloom, so it must be passable, these lads where fairly hardcore as well.

See how my Clutch housing repairs goes this week, might see ya there eh?

Bruce

[Bruce CurtisMember]

You probably already know this Robo, but eastern end of Unumgar is quite passable ATM, starting from the Concrete culvert turnoff 2ks down the kyogle road, rode out of there the other day. Craig and I did some clearing there a few months back as well.

Tracks are getting overgrown, some F/trails are now flowing S/T.

BC

[Bruce CurtisMember]

Take engine out, have helicoil removed and redrilled to next oversize, straight this time and re coiled.

peace of mind then.

BC

[Bruce CurtisMember]

Oh you have one of “THOSE” master cylinders, mine has the remote reserviour up near the carby.

I’m not a fan of “those” reserviours, too hard to refill.

Bruce.

[Bruce CurtisMember]

Austblue did you use clamps to push the cylinders back in?, leave the cap of the M/Cyl when doing this with a rag around it and the fluid is supposed to back bleed when the lever is in the neutral position.

The rear brakes I had the same issue, but I did manage to get my union nut to do up enough to lower it to where I like it.

bruce

edit just realised it’s a KTM=brembo

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