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How to Tighten the Chain Properly on a 1977 IT175?

14 Jan 2020 11:32
Songpool5
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How to Tighten the Chain Properly on a 1977 IT175? #1
Hi All,

I was lucky enough to get my hands on a nice 77' IT175. Seems to be in good working condition but the chain was shot so I replaced it.

However, this is the first bike I've worked on that has a spring loaded "tensioner" to take up chain slack which makes me wonder, "How should I be adjusting the chain tension to take that into consideration?

(Also, a bonus side question. The Yamaha DT175 seems like a more popular but similar model of bike. Are the majority of parts with these models interchangeable? Rims specifically?)

Thank you!

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14 Jan 2020 13:59
darinm
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How to Tighten the Chain Properly on a 1977 IT175? #2
I don't know on the chain, but I don't think the DT175 has a whole lot in common with the IT177. DT175 is old technology relative to the IT175, at the time it was a a modern, high performance machine. I believe the rims and hubs will be totally different, with lighter aluminum on the IT175 - can't say as I don't own one.

1972 Yamaha CT2 175
1972 Suzuki TS 185 Sierra
2006 Yamaha XT225

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14 Jan 2020 14:44 14 Jan 2020 14:48 by MarkT. Reason: added link to owner's manual
MarkT
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How to Tighten the Chain Properly on a 1977 IT175? #3
The Owners Service Manual in the Tech Library has the procedure. For items not covered in that manual, use the 1978-81 DT175 service manual. yamaha-enduros.com/index.php/ownders-man...t175e-service-manual

The IT175 is high performance... and the monoshock 78-81 DT175 is heavily based on the 77-79 IT175 as sort of a "detuned" version.

I could write a book on the differences... You asked about the wheels... IT175 has the same hubs with aluminum wheels. DT175 hubs are laced to steel wheels. IT175 brake plates are magnesium, DT175, aluminum. Brake arms are aluminum on IT, steel on DT.

Cylinder base and reed valve on IT175 are bigger bolt patterns... cylinder heads have same bolt pattern. Basic engine design is the same, some slightly different parts like gear ratios. Crank and rod are the same. Ignitions are different but can be swapped as assemblies. Clutch is the same.

Frame, forks, shock and steering head are bigger on IT175 and not interchangeable with DT175.

That's the basics... you got yourself a great bike! :Buds

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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14 Jan 2020 15:06
darinm
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How to Tighten the Chain Properly on a 1977 IT175? #4
Mark's knowledge is always impressive :)

1972 Yamaha CT2 175
1972 Suzuki TS 185 Sierra
2006 Yamaha XT225
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14 Jan 2020 15:42
Steve F
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How to Tighten the Chain Properly on a 1977 IT175? #5
Definitely down load & print the the manual Mark speaks of.
It's your 1st line of defense & info. Great bike you have.
Love my 78 model & you'll have a blast with your's.
Post up a pic or 2. Would like to see your bike.
Good luck!Welcome!

1974 DT250A
1974 DT250A
1974 GT80A
1977 IT175D "Alex'
1978 IT175E "Paul"
"And there ya have it"

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15 Jan 2020 07:31
Songpool5
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How to Tighten the Chain Properly on a 1977 IT175? #6
Hey Mark,

Thank you for all that great information! Your in-depth knowledge is very impressive indeed. I also appreciate the link to the service manual! I'll make sure to go through it thoroughly.

I have a little washing and tire replacement to do still, but after that I'll snap a few beauty pics and post one.

Happy to have found such a knowledgeable and welcoming group!
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