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Paint questions 1977 dt250

  • MrDrSirMan
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Paint questions 1977 dt250 was created by MrDrSirMan

I have the cases, side cover, jug and head of my 1977 dt250 sent out to sand blasting. Tomorrow I'm going to paint them. I'm just curious about any recommendations anyone may have in terms of what paint to use. Should I prime it? It doesnt seem to be primed from the factory. Just tell me your tales.  
10 Feb 2024 17:27 #1

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Replied by Ht1kid on topic Paint questions 1977 dt250

Clean clean clean your jug and head numerous times. Make sure all of your jug ports etc are super clean and sand free. I think most members use VHT paint
10 Feb 2024 17:57 #2

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Replied by MarkT on topic Paint questions 1977 dt250

Side covers may be magnesium.  Not sure how they will hold up to sand blasting? 

Tricky to paint magnesium without special expensive primer.  Normal paint often comes right off if not prepped good.  If original paint is still there you can paint over it.  I have used Gibbs Brand Lubricant on magnesium before painting which sounds like a mistake.  But they say it works and it does.
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
10 Feb 2024 21:54 #3

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Replied by Schu on topic Paint questions 1977 dt250

The link below shows you how the paint simply flakes off the magnesium side covers like Mark just described. Scroll to see how I ended up spraying them with a light coat of Rustoleum truck bed coating. Not recommended if you want the original appearance, but as you can see, my 400 is by no means original. I think the textured finish looks perfect for what I wanted, and it has held up for several years now.
imgur.com/a/CylpdhM
 
Schu

CT1B, CT1C, JT1, JT2, DT360A, GT80B, DT100B, DT125B,
DT175B, DT175C, DT250B, DT400B, Z50, SCR950

Someday, you'll own some Yamahas
11 Feb 2024 07:21 #4

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  • MrDrSirMan
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Replied by MrDrSirMan on topic Paint questions 1977 dt250

Are you sure the covers are magnesium? I had a 400 and they had mag stamped in the side. The left side of this bike is for sure plastic. I believe the right is aluminum. I put some 5% distilled vinegar on it and I saw no bubbles but maybe I need something more acidic? Additionally I got rustoleum engine enamel primer and paint. They didn't have VHT where I went to grab paint. I did an exhaust with this combo once and It came out fine but that was the extra high temp stuff so not sure about this. 
11 Feb 2024 16:12 #5

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Replied by MarkT on topic Paint questions 1977 dt250

I'm not sure.  I said "may be magnesium".   Earlier ones were for sure. 

5% should bubble up on bare magnesium.

Another test is file the edge and try to light the shavings on fire.
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
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11 Feb 2024 17:03 #6

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