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TOPIC: 1978 Dt400 with fmf turbinecore

1978 Dt400 with fmf turbinecore 11 Apr 2019 16:03 #1

  • Fpalbrecht
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Could someone with a 77 or 78 DT400 and a fmf turbinecore post a picture. I'd like to see how you installed it.
Thanks much.

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2016 Yamaha Super Tenere
2009 Honda Goldwing
2003 Honda Superhawk
1999 Suzuki DR350
1978 Yamaha DT400
1974 Yamaha RD350

Re:1978 Dt400 with fmf turbinecore 08 May 2019 14:48 #2

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Finally found someone who could bend 1 1/4" pipe. Turned out great. Now the tuning fun begins.
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2016 Yamaha Super Tenere
2009 Honda Goldwing
2003 Honda Superhawk
1999 Suzuki DR350
1978 Yamaha DT400
1974 Yamaha RD350

Re:1978 Dt400 with fmf turbinecore 08 May 2019 15:36 #3

  • KennyV
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Nice work, looks great.
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71 Z50 Minitrail
72 RT2
74 250A
78 XT500E
06 F650GS Dakar

Re:1978 Dt400 with fmf turbinecore 08 May 2019 16:17 #4

  • MarkT
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Very nice job! Looks like it came that way from Yamaha! :likey
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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

Re:1978 Dt400 with fmf turbinecore 23 May 2019 13:06 #5

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Finally had a chance to play with the jetting. For now, stock pilot, needle in the middle position(there are 5). 220 main. I'm not done with the main. Started at 250,went to 260, 240, 230, I'm at 220. After leaning out the needle to middle position I scared the crap out of myself. The bike stood straight up in first and will raise the front in 2nd and 3rd. On a gravel road. Rpms climb very fast to 5000-5500. After that it's not happy. Which is what people say. Has anyone got the 77/78 DT400 to rev smoothly past 5500? Power up to 5000 is great. I can be happy with it as is but will try some more lower mains when I have time.
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2016 Yamaha Super Tenere
2009 Honda Goldwing
2003 Honda Superhawk
1999 Suzuki DR350
1978 Yamaha DT400
1974 Yamaha RD350
Last Edit: by Fpalbrecht. Reason: Hit wrong button

Re:1978 Dt400 with fmf turbinecore 31 May 2019 03:00 #6

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I tried 200, 195 and have settled on 190 main. Stock for 77-78. I think I'm done as far as jetting goes. Very fun to ride. Had it off road and love it. Now it's time to spruce up the cosmetic side.
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2016 Yamaha Super Tenere
2009 Honda Goldwing
2003 Honda Superhawk
1999 Suzuki DR350
1978 Yamaha DT400
1974 Yamaha RD350

Re:1978 Dt400 with fmf turbinecore 31 May 2019 09:13 #7

  • FrankC
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I don't believe anybody has gotten the 78 400 to live happy past 5500.

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Re:1978 Dt400 with fmf turbinecore 31 May 2019 12:50 #8

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4500-5500(maybe 6000) is definitely the sweet spot. But if I had to I think it would hold 6200. That would be over 60mph in 5th and I have no reason to go that fast on this bike. I'm really happy with the performance 1st-3rd trail riding. 45mph in 4th and as long as I'm at 4500 rpms when I shift into 5th, everyone is happy. 5th gear 55-60 all day. But where it really shines is gear 1-3.
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2016 Yamaha Super Tenere
2009 Honda Goldwing
2003 Honda Superhawk
1999 Suzuki DR350
1978 Yamaha DT400
1974 Yamaha RD350
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