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Makotosun

Incoming ….. The Brave Pill

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Replied by MarkT on topic Incoming ….. The Brave Pill

The "problem" is the parts lists and manuals are all dated mid-1968 (or later).  Yamaha was probably ramping up 1969 production by then? 

That tank bracket change probably happened sometime in 1967 with the bolt size change?   I can't imagine such an obscure, limited part would have ever been made aftermarket. 

Hopefully Enduronut, another expert, or someone that has a very early DT1 will comment...  so many little details are undocumented. 
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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21 Nov 2021 14:16 #21

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Replied by type one on topic Incoming ….. The Brave Pill

So …. time to investigate the engine issues … first inspection of the exhaust port and head off didn’t look great tbh …
  

head bolts were reasonable easy to undo.

 
DT1's mainly -
x4 1968 US (survivor, shiny resto, MX frame mods & early project)
1968 AUS
1969 Early B front yard ripper
1969 B scabby track bike
1969 B MX project
73 CT3 project
'77 z750 hard tail chop ......
BMW GSA 2018
22 Nov 2021 14:21 #22

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Replied by type one on topic Incoming ….. The Brave Pill

…. Actually went better than I thought as crank freed up and looks very clean and the inlet port is very clean and the back of the piston looks clean as well…

  

piston is stuck fast …. Penetrating fluid and some taps with a block of wood/mallet have seen minor movement but not sure the best course of action next
???? 
cheers
T1

 
DT1's mainly -
x4 1968 US (survivor, shiny resto, MX frame mods & early project)
1968 AUS
1969 Early B front yard ripper
1969 B scabby track bike
1969 B MX project
73 CT3 project
'77 z750 hard tail chop ......
BMW GSA 2018
22 Nov 2021 14:26 #23

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Replied by Gr8uncleal on topic Incoming ….. The Brave Pill

Don't know if your engine will be heavy enough, but this is what I did on my Suzi GT550!  

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22 Nov 2021 23:42 #24

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Replied by shyted on topic Incoming ….. The Brave Pill

Do you know what Evaporust is ? I unseized a 1969 HT 1 motor with it.
It was solid in the bore and crank. The barrel was already an inch in the air on the studs strangely enough. One day it was in there and both ends freed up.
You can buy it here in the UK for £25 per gallon and it's re cyclable for further use. I swear by it now and i found out about it on this site.
 
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23 Nov 2021 00:27 #25

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Replied by yamahahaha on topic Incoming ….. The Brave Pill

Have you tried using heat gun. Alternate with heating and cooling. Try hammer and piece of wood each time
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24 Nov 2021 10:53 #26

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Replied by type one on topic Incoming ….. The Brave Pill

Yes Yamahaha … that is definitely on the cards Asan option …. Gonna give the other options or variations of them a go first and then the heat gun …

cheers
T1
DT1's mainly -
x4 1968 US (survivor, shiny resto, MX frame mods & early project)
1968 AUS
1969 Early B front yard ripper
1969 B scabby track bike
1969 B MX project
73 CT3 project
'77 z750 hard tail chop ......
BMW GSA 2018
24 Nov 2021 13:02 #27

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Replied by type one on topic Incoming ….. The Brave Pill

  

A little progress….. after the soak in freeing agent didn’t work I bought a heat gun this morning and took Yamahahas advice …. worked a treat … 

the top of the piston is badly corroded so I can’t tell what size it is ….. I have 0.25 and 0.5 so will have the barrel vapour blasted and rebored to suit …..

cheers
T1
DT1's mainly -
x4 1968 US (survivor, shiny resto, MX frame mods & early project)
1968 AUS
1969 Early B front yard ripper
1969 B scabby track bike
1969 B MX project
73 CT3 project
'77 z750 hard tail chop ......
BMW GSA 2018
08 Jan 2022 14:10 #28

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Replied by type one on topic Incoming ….. The Brave Pill

 
Also capt dave has confirmed the tank stay is the same on his No51 …. this early stay must be super rare!!
cheers T1
 
DT1's mainly -
x4 1968 US (survivor, shiny resto, MX frame mods & early project)
1968 AUS
1969 Early B front yard ripper
1969 B scabby track bike
1969 B MX project
73 CT3 project
'77 z750 hard tail chop ......
BMW GSA 2018
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Last edit: 08 Jan 2022 14:25 by type one.
08 Jan 2022 14:24 #29

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Replied by type one on topic Incoming ….. The Brave Pill

Does anyone know anything about the numbers stamped on the bottom of the engine cases? Likely just factory production numbers for batches?

cheers
T1 

  
DT1's mainly -
x4 1968 US (survivor, shiny resto, MX frame mods & early project)
1968 AUS
1969 Early B front yard ripper
1969 B scabby track bike
1969 B MX project
73 CT3 project
'77 z750 hard tail chop ......
BMW GSA 2018
09 Jan 2022 04:21 #30

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