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Makotosun

Rebuilding my 74 dt250

  • D7A1Ndt1e
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Rebuilding my 74 dt250 was created by D7A1Ndt1e

Hello all! 

I recently acquired a non running parts bike. I measured the compression at 75psi but I can get the bike to start. So I've decided to rebuild the engine to get the bike running instead of using it as a parts bike. I started pulling the engine apart but came it a hault when I got to the flywheel. Can you tell me how to remove the flywheel? Normally I'd see bolts or screws on the Fly wheel holding it in place  but this engine looks like it has rivets. Any input would be greatly appreciated! 
The top end is shot and will need a piston & pin, rings, and bearings. I'm also going to use gaskets. The last guy who rebuild the engine didn't use gaskets and didn't clean the surfaces. I'm very surprised I was able to get it started with the internal condition of the engine.

Please see attached photos of what I'm working with. I will be using a fly wheel puller. Thanks in advance for any helpful input!
30 Oct 2021 08:08 #1

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Replied by D7A1Ndt1e on topic Rebuilding my 74 dt250

I can't figure out how to post images on here. I just realized my photos didn't load. I will work on trying to figure out how to post an image to show you what I'm talking about. 
30 Oct 2021 08:12 #2

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Replied by Schu on topic Rebuilding my 74 dt250

It might not be you....
I can't  post images today for some reason.
Been trying to figure it out all morning.
I can't even post an image of what displays when I try to add photos!

EDIT
I get a red banner that says
"Could not move file into" and then it lists a long homepage file path.
I am using an old iPad, but it has worked on this site for years with no issue.
Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A, GT80B, DT100B, DT125B, DT175B, DT175C, DT250B, DT400B, Z50

Someday, you'll own some Yamahas
Last edit: 30 Oct 2021 08:26 by Schu.
30 Oct 2021 08:18 #3

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  • Gr8uncleal
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Replied by Gr8uncleal on topic Rebuilding my 74 dt250

This is a photo test only.

Yep - same error message here. 

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30 Oct 2021 08:30 #4

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Replied by MarkT on topic Rebuilding my 74 dt250

Make sure you use the correct flywheel puller.  Motion Pro 08-0026 is a good one. 

Using a jaw puller often destroys the ignition.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
30 Oct 2021 08:38 #5

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Replied by Schu on topic Rebuilding my 74 dt250

Well then I guess I will stop trying to figure it out and prepare to watch college football.
(Pigskin ball. Not the round ball)
One of our Michigan teams will remain undefeated and the other will see it's first loss. Big time rivalry.
 
Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A, GT80B, DT100B, DT125B, DT175B, DT175C, DT250B, DT400B, Z50

Someday, you'll own some Yamahas
30 Oct 2021 08:41 #6

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  • Gr8uncleal
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Replied by Gr8uncleal on topic Rebuilding my 74 dt250

"Well then I guess I will stop trying to figure it out and prepare to watch college football.
(Pigskin ball. Not the round ball)
One of our Michigan teams will remain undefeated and the other will see it's first loss. Big time rivalry."
 
Or, you could watch England vs Australia in the T20 cricket World Cup - even bigger rivalry! 

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30 Oct 2021 09:15 #7

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