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Discussion in 'Thumpers' started by sleepywombat, May 1, 2006.
Careful Nogood - he only wants you for your welder.
My wrist pin looked like that @ around 65,000km. No idea whats normal as its the only engine I've gone that far down the rabbit warren with.
i'm fine with that,
and everyone in this thread will get an invite to the wedding..
i reckon @cyberdos is a smart bloke too.
i figure he's probably already spoken to @procycle and set up a wedding gift registry for us at procycle..
fridge or toasters be damned, a proper wedding gift is a 790 kit.
a lot of folk here might think i'm just a dumb aussie, but i'm secretly playing the long game for the benefit of my DR..
Lots of "wet" carbon. Worn cylinder and rings. Smoking on startup and later smoking all the time. So, is it possible that what we're looking at here is the effect of long term overly rich carburation?
I looked and did not see any dot on the second ring. Will post pics later tonight.
Did switch to prime. Seemed to help a tiny bit - but that might have been my imagination. I'm going to check the air and fuel filter today.
Stripped fasteners, unknown maintenance, unknown treatment, difficult to diagnose problems... yep, buying new was worth it!
Sorry it's being such trouble for you. You've got the best DR minds right here, and we'll do all we can to help!
Very possible. When I first saw the picture of the exhaust port I mentioned it.
Anybody know the dia of the preload spacers for the forks,the ones on top of the springs?I want the get some pvc and cut to size. Thanks
Went out and measured mine. Just shy of 1.5 inches. I think I used 1" Sched 40 on my last DR and it worked fine.
Can it be one of those "open" relationships?
The ones I made on the lathe before I got DDCs measure: 1.445" OD
Took out some pistons today with little run time on them and a good example of ring contact.
First picture you can see the dot on the second ring showing up.
In this picture the top ring is a D faced (or some call it a barrel face) Moly ring. The wear is in the center and doesn't go all the way to the edges.
Second ring is a reverse taper. You cans see a light wear (shiny) mark on the bottom of the ring. That is the only part that touches the cylinder wall.
I find US stuff has a dot showing up orientation. Foreign stuff often has a letter. Most I see have the letter "N". Not sure why N, maybe the non-US guys can chime in and break the code for me.
Ever see a triangle stamp on a ring before?
Piston or finger?
Can't say I have. Mahle (Germans) put an "M" for Mahle on theirs. Most stuff they send to us dumb Americans also has "TOP" written out on it. They want to make sure. LOL
All.i could find
Will report back next week
Thanks for the flashback! Aside from the riders (Joel Robert was pretty awesome!) a couple of things struck me. First was the simplicity of it all. These riders were the creme-de-la-creme of the motocross world yet they were traveling in small conversion vans using trailers that would likely not pass most vehicle inspections today. Factory sponsorship back then likely consisted of a bike (if you were top tier) or maybe just tires and parts. Secondly, was the almost complete lack of safety equipment for both riders and spectators. Not even ear plugs and those bikes were LOUD. I suppose the full face helmet was yet to be "invented" in 1970. However, they were running those front of the front fender mud flaps we discussed the other day. ;-) Interesting.
lotta Maico's in that vid. Maico got the holeshot in the first moto on the tape. I like the strategy of fish-tailing and knocking down as many competitors as possible right off the bat.