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Makotosun

1979 IT 400 restoration

  • Gr8uncleal
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Replied by Gr8uncleal on topic 1979 IT 400 restoration

"Wish I could change the title of this thread. LOL"

Mark can probably do it, if he sees these posts. 

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06 Dec 2022 11:39 #11

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Replied by MarkT on topic 1979 IT 400 restoration

It took a few tries... think I got it changed though.
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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06 Dec 2022 14:58 #12

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  • GaryInVA
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Replied by GaryInVA on topic 1979 IT 400 restoration

Whoohooo!  Thank you so much for doing that. Now I won't feel like I'm a fraud as this bike slowly makes its way back to running condition.
Last edit: 06 Dec 2022 16:40 by GaryInVA.
06 Dec 2022 16:39 #13

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Replied by shyted on topic 1979 IT 400 restoration

That would be great . Riding a dirt bike on dirt roads going to work.
07 Dec 2022 02:25 #14

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Replied by GaryInVA on topic 1979 IT 400 restoration

Got a chance to work on it with my son this weekend. Pulled off the seat, tank, pipe and silencer, and then the head. It's soaking in Kroil right now. Have been able to get the piston to move 0.5 inches so far.

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Last edit: 09 Jan 2023 09:45 by GaryInVA.
09 Jan 2023 09:41 #15

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Replied by RT325 on topic 1979 IT 400 restoration

That's going to be fun when up & running. Plenty of power to be had waiting in there. It's a shame when bikes get parked up for years & go rusty like that, but it happens.
09 Jan 2023 15:10 #16

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Replied by GaryInVA on topic 1979 IT 400 restoration

Figuring that I'll have to go .25 over on this piston and rings. Been seeing different opinions on different makers of pistons. Anyone know what is available for this bike other than a Wisco? Or do you have good opinions on Wiscos?
10 Jan 2023 06:28 #17

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Replied by MarkT on topic 1979 IT 400 restoration

Wiseco goes in steps of 0.5mm.  If shop bores to Wiseco spec...  not a "little extra clearance"... and you check ring gap to make sure it's not too tight, they work great in my experience.  I've used them for decades and never had an issue. 

(Being a racing piston, in the early days instructions said to file the end gap to get it perfect...  ring gap is something that should always be checked even with OEM parts.  But people ignored the instructions and had issues.  Wiseco has since opened up the ring gap so not likely required to file...  but should be checked.)

Check with Enduronut to see if he might have an OEM piston.

Wossner or Vintco are two other potential sources.
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
10 Jan 2023 06:44 #18

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Replied by AirborneSilva on topic 1979 IT 400 restoration

I put a Wossner piston in my DT2 and am happy with it, got it from e-bay seller bikebuzzard here's his link bikebuzzard
2023 Tenere T7
1976 DT400C
1975 DT400
1981 DT175H
1972 DT2 250
1980 GT80
1972 JT2
10 Jan 2023 06:44 #19

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  • GaryInVA
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Replied by GaryInVA on topic 1979 IT 400 restoration

I can find 1978 IT400 piston and rings all over but nobody lists a 1979. Were they different than the 1978?

Edit: After doing a little bit more reading, I see that they are different sizes diameters. This should be fun trying to find one.
Last edit: 10 Jan 2023 14:41 by GaryInVA.
10 Jan 2023 13:19 #20

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