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Steve F DT250A resto update

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Replied by Makotosun on topic Steve F DT250A resto update


What he said! Just make sure to add an allen wrench set to your toolkit!
IF it isn't one thing, it's another.
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04 Jul 2015 19:38 #71

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Replied by Steve F on topic Steve F DT250A resto update

The bike had allen head screws in the covers & cases when I acquired it in 1977. That was a plus that I thought was original to the bike. Will repaint them black.
I have purchased all the NOS cover gaskets, hd&cylinder gaskets, oil pump line delivery gaskets.
Will need to source the seals/bearings though. Time to go shopping. :)
Here's a look at the pipe guts that Meis is doing for me.

:arrow:
Looks pretty cruddy inside.
She's turning into a sleeper. Looking forward to that.
1974 DT250A
1974 DT250A
1977 IT175D "Alex'
1978 IT175E "Paul"
"And there ya have it"
05 Jul 2015 14:17 #72

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Replied by Steve F on topic Steve F DT250A resto update

Looking for crank case seals, hard to find.
been to NWVCP, PARTZILLA, SPEED&SPORT
where else should I fish?
do other yr's fit same motor (1974 dt250a), prt no. is diff. for newer engine cases(1975 B seals are available ).
e-bay has some overpriced stuff. :S
1974 DT250A
1974 DT250A
1977 IT175D "Alex'
1978 IT175E "Paul"
"And there ya have it"
06 Jul 2015 07:11 #73

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Replied by Devin on topic Re:Steve F DT250A resto update

Enduronut has lots of seals, it's where I got mine.


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06 Jul 2015 08:18 #74

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Replied by Enduronut on topic Re:Steve F DT250A resto update

.

Yes . . .that's right, I still have all of the original Yamaha crankshaft seal in stock ... even the rare ones

.

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Control your thoughts . . . or your thoughts will control you!.
You can't accomplish . . . what you haven't dreamed!
Don't aim . . . and you'll hit your target every time!
A wise man knows . . . he isn't!
Failure squared . . . equals success!
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06 Jul 2015 13:25 #75

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Replied by Steve F on topic Re:Steve F DT250A resto update

Well I got crank case seals coming from enduronut, (THANKS),so today was motor tear down day. This should be interesting. :arrow:

First it got a bath, then the tear down started.


Inspection of side play, con rod big end. .020 inches, max play according to manual spec, ? leave it or break it down and replace worn parts? How long could this last like it is?


Clutch plates spec, good. :)

That was todays progress... :)
1974 DT250A
1974 DT250A
1977 IT175D "Alex'
1978 IT175E "Paul"
"And there ya have it"
08 Jul 2015 18:12 #76

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Replied by Enduronut on topic Re:Steve F DT250A resto update


Hard to say from just the side clearance spec . . . but it's not absolutely necessary to rebuild until that measurement exceeds .023"
In my opinion, side clearance is the least critical measurement of the crank

~ As you hold the connecting rod and rotate the crank, is it buttery smooth, or do you feel any roughness?
~ Gently rock the small end of the rod back & forth (from left to right) . . . should be 2mm or less movement
~ Can you detect any radial movement? (up & down or vertical rod movement)

By the way, . . . Looking at the photo above, has/is the engine case cracked along the base of the cylinder?

.

.
Control your thoughts . . . or your thoughts will control you!.
You can't accomplish . . . what you haven't dreamed!
Don't aim . . . and you'll hit your target every time!
A wise man knows . . . he isn't!
Failure squared . . . equals success!
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09 Jul 2015 10:51 #77

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Replied by DEET on topic Re:Steve F DT250A resto update


The horizontal line looks like an over application of a sealant. Or maybe it was applied in a sloppy manner...

The small vertical line "looks" like it could be a casting flaw, but not a crack. If it extends into the gasket surface, it could indicate a crack.
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Where the Yamaha Enduro is still a current model...
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Last edit: 09 Jul 2015 13:15 by DEET.
09 Jul 2015 13:05 #78

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Replied by Bigdog302 on topic Steve F DT250A resto update

oh wow! it has a baffle in it. adding in the cone and removing the additional baffle would certainly help! I need to get at least 1 1974-76 250,360 or 400 sleeper pipe done! I wonder if I can use such a pipe on the Super DT400 but also modified to take advantage of the additional revs that engine is capable of.

a stock MX400B is good to 8000 to 8500.
2 1968 DT1s,1970 RT1M,1970 DT1C,1971 RT1B,1971 Honda Z50K2,1974 DT100A 1974DT250A,1974 Honda MT250,2 1975 DT400Bs,1975 Honda CR250M1,1978 DT175E,1979 Honda CR250R.
Dave
Jesus is Lord!
09 Jul 2015 13:27 #79

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Replied by Meis on topic Steve F DT250A resto update


yes we can design a Sleeper Pipe to work at those rpm's
"Get Sideways ".....Meis
09 Jul 2015 14:30 #80

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