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1980 dt125mx 6 hole head

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1980 dt125mx 6 hole head was created by ogre

hi all on my 125mx i noticed when i came to strip it has a 6 hole head gasket and 6 studs.everywhere i look should be 4 hole even on 175.its a basket case so before i try to repair the barrel i want it standard if poss.its the right size got 123cc on side of it.were these an upgrade or aftermarket.
cheers ogre 
24 Nov 2022 03:10 #1

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Replied by ogre on topic 1980 dt125mx 6 hole head

just had a proper look its got 2A8 on the barrel and 2A7 on the head with the yamaha logo so presume genuine yammy
24 Nov 2022 03:24 #2

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Replied by MarkT on topic 1980 dt125mx 6 hole head

2A7 is a DT175 head which has 6 studs holding it on.

When you get to the monoshock generation, only the 125 had 4 studs holding on the head.

My guess is someone has doctored a 175 cylinder marking to say 123...  Since you're calling it an "MX"  which means "monoshock" in other parts of the world I'll guess you're not in the USA? 

Anyway, I've heard that some countries had licensing age and displacement restrictions so there could have been an incentive to forge the displacement and model markings on the barrel. 

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If bore is around 56mm, cylinder is a 125.  If bore is 66mm or more, then cylinder is a 175.  That's a 10mm difference so should be easy to tell.
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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24 Nov 2022 06:29 #3

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Replied by ogre on topic 1980 dt125mx 6 hole head

hi no im in the uk and your probably right they have stamped there own i think cos i measured the bore and it is 66mm bore not 56mm so dt175 hopefully pics will upload thanks.
24 Nov 2022 07:58 #4

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