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1975 DT400 Piston

  • jerryd68
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1975 DT400 Piston was created by jerryd68

1975 DT400. I have been working on my DT400. Since there was enough piston slap that you could hear it while it runs I have decided to bore to the next size and replace the piston. I purchased a 1 size over piston and ring from someone on this site. What are the recommendations for the machine work that will need to be done to the cylinder? Thanks
74 Yamaha DT360
75 Yamaha DT400
77 Yamaha DT100
87 Honda XL600R
87 Honda XR600R
97 ATK 605
09 Kawasaki KLX450R
05 Harley Electra Glide
15 May 2020 08:02 #1

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Replied by Bigdog302 on topic 1975 DT400 Piston

Bil Bune or Enduronut here at the Forums. Enduronut has bored many cylinders and he is my first go to. I have not had any work done by Bill Bune but I hear great things about him. Enduronut is a Moderator here and you can send him a private message.

here is a Link to Bill Bune. www.billbune.com/
2 1968 DT1s,1970 RT1M,1970 DT1C,1971 RT1B,1971 Honda Z50K2,1974 DT100A 1974DT250A,1974 Honda MT250,2 1975 DT400Bs,1975 Honda CR250M1,1978 DT175E,1979 Honda CR250R.
Dave
Jesus is Lord!
15 May 2020 17:47 #2

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Replied by Mothersbaugh on topic 1975 DT400 Piston

Enduronut gave up boring a couple of years ago, I do believe...
15 May 2020 17:55 #3

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Replied by Bigdog302 on topic 1975 DT400 Piston

I know he gave up porting cylinders but last I checked sometime back, he still was boring cylinders. I sent him a private message asking if he's no longer boring cylinders. we will have to wait to hear back from him.
2 1968 DT1s,1970 RT1M,1970 DT1C,1971 RT1B,1971 Honda Z50K2,1974 DT100A 1974DT250A,1974 Honda MT250,2 1975 DT400Bs,1975 Honda CR250M1,1978 DT175E,1979 Honda CR250R.
Dave
Jesus is Lord!
Last edit: 15 May 2020 20:38 by Bigdog302.
15 May 2020 20:36 #4

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  • jerryd68
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Replied by jerryd68 on topic 1975 DT400 Piston

I contacted Bill Brune, I will be sending the cylinder and piston to him, he has asked what piston to cylinder clearance I want to run, not sure what to tell him. Please advise
74 Yamaha DT360
75 Yamaha DT400
77 Yamaha DT100
87 Honda XL600R
87 Honda XR600R
97 ATK 605
09 Kawasaki KLX450R
05 Harley Electra Glide
18 May 2020 15:14 #5

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Replied by mdscott on topic 1975 DT400 Piston


The factory manual says, min .040mm max .045.mm
Thanks Mark
Roseville, Ca.

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Last edit: 19 May 2020 08:19 by mdscott.
19 May 2020 08:19 #6

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  • jerryd68
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Replied by jerryd68 on topic 1975 DT400 Piston

Perfect, Thanks
74 Yamaha DT360
75 Yamaha DT400
77 Yamaha DT100
87 Honda XL600R
87 Honda XR600R
97 ATK 605
09 Kawasaki KLX450R
05 Harley Electra Glide
19 May 2020 12:21 #7

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Replied by Lizeec on topic 1975 DT400 Piston

The piston to cylinder clearances depend on whether you are using a genuine Yamaha piston or an aftermarket such as a Wiseco, the Wiseco will have different clearance specifications than the Yamaha piston.
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19 May 2020 16:55 #8

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  • jerryd68
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Replied by jerryd68 on topic 1975 DT400 Piston

The piston that I purchased is a yamaha piston. Thanks
74 Yamaha DT360
75 Yamaha DT400
77 Yamaha DT100
87 Honda XL600R
87 Honda XR600R
97 ATK 605
09 Kawasaki KLX450R
05 Harley Electra Glide
20 May 2020 09:27 #9

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Replied by MarkT on topic 1975 DT400 Piston

In inches the spec in the manual is 0.0016" to 0.0018"... you can look it up yourself in the Tech Library.
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
The following user(s) Liked this Post: Snglsmkr
20 May 2020 09:35 #10

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