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1976 yamaha AG 175

  • s900t8v
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1976 yamaha AG 175 was created by s900t8v

Hi new to the forum, heres my yam :)

This was what I bought (3x ag 175 bikes, came with a 4th engine) for a few hundred bucks - they had been heavily farm abused.
AG 175 uses the CT2 motor with different gearing

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did a quick and cheap paint and tidy up - , but the real deal was to mod the engine to make some more ponies for as little cash as possible

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this is where it sits now
- rebuilt bottom end bearings + seals - CT2 gearset (ag gearset is short ratio) original 12,000km top end - good comp
- new wheel bearings, seals, fork seals, chain, tyres, new cables, cosmetics etc

mods
- ported cylinder, exh 180 degrees transfer 145 degrees - upjetted
- inlet widened to fit DT 175 reed cage - boyesen reeds fitted
- expansion chamber
- boost bottle

to do
- cut own DT 175 cylinder head from 25cc to 18cc, recut squish
- mikuni 34mm flatslide
- widen exhaust port
- increase transfer duration another mm or so
- increase reeed cage inlet
- bore and hone cylinder once I'm happy with porting
- new needle bearing conrod to rebuild crank
- new rings + DT piston
- shorten header to have pipe rip to 10,000rpm
- CDI
- new clutch - current one slips like a pig but still lifts the front end
1976 Yamaha rAG175
1969 Yamaha L5T
The following user(s) Liked this Post: James Hart
Last edit: 27 Nov 2015 16:01 by s900t8v.
15 Jan 2015 02:36 #1

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Replied by Hammer on topic 1976 yamaha AG 175

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Oh the horror! A perfectly adequate off/on road tiddler, converted to, to, a CAFE RACER! Oh the shame of it all! :haha
Leroy Miller must be crying into his beer if he's seen this!

Oh, WELCOME ABOARD! We NOW have all types here...

Hammer
"Who, More than Self, His Country Loved."
15 Jan 2015 03:24 #2

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Replied by Makotosun on topic 1976 yamaha AG 175

We welcome all types! It sounds like you have done some neat performance mods to the bike.

I am wondering if you have an extra usable fuel tank in your stash? I would love to find one I could use as an extra capacity tank on my AT1 if going out for and extended backwoods jaunt.

THe bike looks to be quite nicely done!

Welcome to the site.
IF it isn't one thing, it's another.
15 Jan 2015 06:49 #3

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Replied by Hammer on topic 1976 yamaha AG 175

All,

The pipe caught my attention. Whoever made it, made it removable and easily re-packable. Sweet! Is that a support for the battery bracket between the frame and the battery box? Nice job there, too!

Hammer
"Who, More than Self, His Country Loved."
Last edit: 15 Jan 2015 07:20 by Hammer.
15 Jan 2015 07:19 #4

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Replied by s900t8v on topic 1976 yamaha AG 175

haha yeah sorry its not a pure bred... I figured that doing a resto./custom job would extend the life of these bikes that would otherwise have probably ended up as scrap!

hey makotosun sorry I dont have a spare tank, I disposed of all my spares except for the engine parts.

the pipe is made by bert flood, a friend gave it to me... its a fairly good pipe despite the fact it was made for a 500 triple (specs are almost the same as what I wanted though). I am probably going to make a fatty high pipe for a wider powerband an a better look... i've done all the maths for a better pipe.

I modified the stinger and inserted it into the belly of the chamber to reduce noise.. yeah the silencer is very easy to repack etc...

the aluminium bracket holds the seat on!
1976 Yamaha rAG175
1969 Yamaha L5T
Last edit: 15 Jan 2015 11:42 by s900t8v.
15 Jan 2015 11:40 #5

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Replied by MotoMan354 on topic 1976 yamaha AG 175

I like it a lot :likey I bet it is a riot on a twisty back road. Jeff
To race is to live and everything else is just waiting.
16 Jan 2015 20:39 #6

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Replied by denverbiker on topic 1976 yamaha AG 175

Great Job!!!
18 Jan 2015 11:52 #7

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Replied by s900t8v on topic 1976 yamaha AG 175

hey thanks for the nice comments guys!

quick update

I found a set of new old stock OEM friction plates on ebay - got 5x for $30!, I've had endless problems with clutch slipping like a pig the whole time so I am looking forward to putting them in, I have brand new steels as well and I will re use the original springs but shim them back to their original height. if the clutch slips I will have to go to uprated springs and then I dont know what. I am going to use type F ATF in the gearbox and hopefully that provides a solid improvement in clutch grip.

I also bought a used 32mm mikuni roundslide off ebay for $15 delivered lol, figured it is probably not going to work, have no idea if its for 2 stroke or 4 stroke or what! lol but for $15 thought why not. I have a bunch of main jets an pretty sure idle jets etc are all interchangeable if not i'll just sell it off again.
1976 Yamaha rAG175
1969 Yamaha L5T
27 Jan 2015 23:18 #8

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Replied by Bigdog302 on topic 1976 yamaha AG 175

looking really good! B)
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!
28 Jan 2015 08:21 #9

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Replied by pntrbl on topic 1976 yamaha AG 175

New stock green colored springs are like a buck and a half a piece. The free length spec is 1.433. 10% less is considered "time to replace" in a few manuals I've seen.

Your call tho! :)
28 Jan 2015 20:49 #10

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