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mx250 vs yz125F

01 Apr 2020 06:49
gw1170
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mx250 vs yz125F #1
Hi all, looking at buying a play bike/ sometime vinduro bike, talking over with a mate and we have found a 74 mx250 and a 79 yz125F, obviously both very different and being as I'm not doing serious motocross and the value is unimportant which would you recommend ? The 125 appeals as it has better suspension but my mate say's it will need a lot more engine maintenance whereas the 250 short on suspension but would run and run....any ideas ?

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01 Apr 2020 14:42
Schu
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mx250 vs yz125F #2
If it were me, and it's not.....I would stay away from the YZ125. My son had that same bike and it was nothing special unless the throttle was pinned wide open. The power band on that bike is either ON or OFF. I found it hard to enjoy that bike for the type of trail riding we did.

Schu

70 Yamaha CT175
71 Yamaha CT175
71 Yamaha JT60
72 Yamaha JT60 (2)
74 Yamaha DT360
75 Yamaha GT80
75 Yamaha DT100
75 Yamaha DT125
75 Yamaha DT175
76 Yamaha DT175
75 Yamaha DT250 (2)
75 Yamaha DT400
76 Honda Z50
17 Yamaha SCR950

"Someday, you'll own some Yamahas"
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01 Apr 2020 16:14
Schu
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mx250 vs yz125F #3
Quite a bit of good reading on the YZ125F

pulpmx.com/2014/07/10/gps-classic-steel-87-79-yz125/

Schu

70 Yamaha CT175
71 Yamaha CT175
71 Yamaha JT60
72 Yamaha JT60 (2)
74 Yamaha DT360
75 Yamaha GT80
75 Yamaha DT100
75 Yamaha DT125
75 Yamaha DT175
76 Yamaha DT175
75 Yamaha DT250 (2)
75 Yamaha DT400
76 Honda Z50
17 Yamaha SCR950

"Someday, you'll own some Yamahas"

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01 Apr 2020 18:32
RT325
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mx250 vs yz125F #4
Enjoyed my YZ125F but that was in "79 & same goes for the MX250 in "74 but a lot of water has gone under the bridge since then so Horses for Courses i suppose. How rideable are they both now as regards major work. Buy both & carry on into the sunset. 175 cylinder might fit on the YZ to give it trail type power but lots to consider to find what fits plus crank stroke if different. Or a complete DT175 motor might drop in--don't know. the 250 you're talking is a twin shock? but the "75 MX250B was a different kettle of fish. Monoshock & fast out of the box, [heavy-ish but fast & reliable--in their day].

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01 Apr 2020 20:55
MarkT
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mx250 vs yz125F #5
A 78-81 DT175 engine will bolt right in to the YZ125 frame... maybe even more years if you live in a country that had them after 1981.

77-79 IT175 would bolt in too.

Crank is the same as the later DT175. DT175 cylinder/head should bolt right on to the YZ bottom end... The DT125/175 is very much just a de-tuned YZ125 engine. (IT175 cylinder will not fit a YZ125 case, transfer ports are too big)

In the end, it depends on what you want/like. For trails I prefer smaller lighter bikes even if they have less power... they seem more fun to ride to me.

Have fun with whatever you do! :Buds

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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01 Apr 2020 21:22
mdscott
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mx250 vs yz125F #6
I liked the 74 MX250, nothing special, just fun to ride. I put a bolt-on heavy flywheel, helped with low speed lugging.
4 yrs ago Dove Springs, Red Rock canyon.


Thanks Mark
Roseville, Ca.

'76 Bultaco 143 Frontera
'06 GL1800
'01 KDX220
'68 YG5T 80 Trailmaster
74 DT360
75 Norton
73 CB500K
63 C200
87 PW50
64 McClane Edger
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01 Apr 2020 21:57 01 Apr 2020 22:08 by Rick C..
Rick C.
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mx250 vs yz125F #7
Both Mark's are right.
It depends on if you Want , ring ding ding or WEEEEE on the throttle.
Me, I would do something you don't have to be on the pipe so much. you know what you should get.

We don't really know what type of riding you are planning to do.
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01 Apr 2020 22:03
MarkT
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mx250 vs yz125F #8
To clarify... I would not want the YZ125 for a play bike unless it had more tractable 175 power.

:Buds

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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02 Apr 2020 04:35
gw1170
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mx250 vs yz125F #9
Thanks for all the advice, i was leaning toward the 125 as i raced one in the day but as the bike will be used for fun on an mx practice track day and maybe the odd classic enduro then maybe the 250 would be more usable and less "full on "now im an older guy !

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