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Makotosun

Yamaha 1st year collection purchase.

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Replied by pabdt on topic Yamaha 1st year collection purchase.

How was the fit of the mag side crank in the bearing?

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1969 Yamaha CT1 175
1974 Yamaha DT125A
1974 Yamaha DT360A with SP96 Exhaust
Next…196x-197x Yamaha something.


17 May 2026 20:20 #31

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  • SKYDANCER46
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Replied by SKYDANCER46 on topic Yamaha 1st year collection purchase.

Tight. In fact when it was all together there was no play what-so-ever on either side. If it wasn't for the howling noise of the bearings you would have never known there was an issue. Even the bearings had no movement. This engine was dry everywhere. Not a drop of oil in the crank cavity, bearings or the engine cases. None! I didn't even see much sealant if any in some area's of the center cases. Usually there stuck together pretty good. this one wasn't. 

There was also 2 shims on the mag side and 1 shim on the pump side but the crank rotated freely. Never seen 2 shims on a mag side before. Will have to do some measurement when it goes back together and see what's going on. Have not measured the shim sizes or the crank width yet.

I know this bike was restored as a show bike. He may have just slapped the engine together just to look good. There was shims out of place, wrong circlips and things loose everywhere along with the bad teeth on the gears and gouges on the clutch basket. Never seen anything like it. But I'm not surprised either.

It will be an interesting build for sure. looking forward to it.
1968 DT1 250, 1969 AT1 125, 1969 CT1 175, 1970 RT1 360
Last edit: 17 May 2026 22:05 by SKYDANCER46.
17 May 2026 21:56 #32

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Replied by SKYDANCER46 on topic Yamaha 1st year collection purchase.

So I press the crank apart this morning to inspect. This is what i found.
All was good but the rod. So now it's getting the whole kit and kaboodal. 

I was lucky and found a NOS rod on e-bay 30 miles from me. Will be replacing the bearing, pin and washers too. 
What else is going to come up? 

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1968 DT1 250, 1969 AT1 125, 1969 CT1 175, 1970 RT1 360
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19 May 2026 16:53 #33

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Replied by MarkT on topic Yamaha 1st year collection purchase.

Bummer it was bad.  But a lot better to catch it now rather than in a few months!

I have a feeling it's going to be smooth sailing the rest of the way.  

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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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19 May 2026 19:11 #34

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