Cycle Mechanics | Yamaha 125/175 Hop-Up
5 responses to “Cycle Mechanics | Yamaha 125/175 Hop-Up”
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Published - May 2, 2018
What’s up with the bmw cool-aide lately? Who’s next? Ben? John G? Harley boys gonna buy running bmw’s so they can come camp this year? I’ve seen more bmw bumble-dakar’s in the last 3 weeks then I ever have in my life.
Awesome. I have to do the hop-up. I’m tired of getting dusted by you guys in the 175s.
I imagine that the bottom ends are the same between the DT125s and 175s. I’d be interested to see if the stroke is the same for both motors, if so, you could probably just pop a 175 top end on a 125 bottom end. You’d definitely have to open the cases up to allow for the extra girth of the cylinder skirt on the 175 cylinder, but you might be able to get away with it without having to add any meat to the cases.
I’ve been toying around with the idea of doing it to my 250 with a 360 top end, but 110 CCs worth of girth is a lot more than 50.
The strokes are the same. The ct/ 4 bolt dt 175 cylinder on the dt 125 bottom end was a common mod.
The hop up article for the reed valve ct2 175 is a great read. You can find it by scouring the web.
I have a 69/70 ct1 175. I want to put a 75 dt175 cylinder and head on the ct case. Is this possible?
I remember having the cylinder mods done back in the day for my CT-1 and the difference was like night and day. There’s no doubt I was competitive in the 250 class. Reliability suffered though, as it was a screamer and shorter engine life was the price I paid. It was more temperamental, too. But when it ran, it really ran. I still smile just thinking about it.