s900t8v

ok so I picked up 2 x ag 175 bikes, a 79 model which is pretty rough and really just a parts donor and a 76 model which is going to be the one I ride. I also got a complete 3rd engine for free and a frame... after a fair bit of research I discovered the ag is pretty much a dt 175 with some cost cutting and some durability agricultural/framer style modifications (ie silent block swing arm bushes (dont need grease) etcetc I want to get one on the road as cheaply and quickly as possible! this is how I got it - this is the one I have been doing up terrible photo of the parts donor - thing is rusted to death stripped down the frame to degrease and see what needed replacement bare frame after degreasing - new tyres at this stage - dunlop k70s here shows the bike with the degreased engine back in so what i've done so far - new k70 tyres - new wheel bearings, wheel bearing seals + sprocket bearing - painted frame & shocks and various other bits black - chopped off the heel toe gear selector so its just a toe selector - cleaned carb - reset float height, needle jet height, and mixture - adjusted throttle cable - emptied oil tank, flushed bled and adjusted autolube system I need - rear brake rod - silencer for exhaust (will probably just make an alloy can with 38mm perforated tube, glasspack and then 60mm overlaid aluminium tube - handlebar mirror - turn signals - chain - 16 or 17t front sprocket - chain guard I have ordered - flat bars - will use standard levers throttle etc etc for now - 43mm pod filter the lights and wiring is all good which is great! I was stoked to see a front brake switch! problems at this stage - bike doesn't want to idle, it will idle but then after blipping throttle it will bog down or idle high... to me this is the classic sign of bad crank seals... so it looks like I'l be tearing down and rebuilding a spare motor lol. lucky i have 2x spare motors... I have gone over the engine a few times to ensure there is no exhaust or intake leak.. I suppose a head leak would cause that but I would expect to hear foofing.. future plans - full engine rebuild - boyesen dual stage reeds - port work - expansion chamber - cdI perhaps ? if anyone in aus has any bits I need in particular - rear brake rod - chainguard for dt 175 please let me know cheers

hey all I have an aussie AG 175 1975 model (apparently DT125 gearbox with 175 cylinder- reeds 24mm mikuni etc I just want to see how different hte porting is between cylinders ( or if it is different at all) if anyone has any port pics can they please throw them up cheers ed

yeah wel the ag was apparently an aus and nz bike only... ct3 had speedo + tacho + low front guard.... was the ct3 1 down 4 up or 5 up ? the ag is 5 up.. my understanding is the ag ratio is way too short... I want to do 100kph comfotably so yeah I guess 16 or 17t is the way to go... lucky I have few spare engines, I will leave the runner as is and build up the spare an see how I go... the bike has now got all new wheel bearings and seals, a ghetto black rattle can spray job ove the frame and rear shocks..... I had disconnected the oil pump but my dad had mentioned the fact it will ruin the pump if it runs without oil.. I disconnected as it was blowing lots of smoke, I decided to run premix but now my concern is the crank seals have gone.... its nice to see the ag 175 has a bung where the tacho goes, showing the motors were the same, and it should be easy to run a tacho if I can find one on the bay... I would start a resto, but its more 'cheap cafe racer' than resto.. most of my cash is going into the puch (cranks $400!) can you believe that!!! ag 175 cranks are about $70 lol

hey thanks guys I've checked on the EPC, its apparently the same as a DT125 bottom end with DT 175 cylinder... slightly lower compression, no real chamber, well there is a diverging section that has a diffuser effect, but no converging /baffle section to provide the power kick that the DT's had... that and the dt porting is probably a little more aggressive, a slightly higher exhaust port (greater top rpm) and longer transfer duration,.. same mikuni 24mm roundslide... a bunch of other things similar to the 125 - silent block swingarm mounts etc I think the internal gear ratios are all the same between all variants but the ag 175 got smaller front sprockets to provide lower gear ratios,... I will upgrade the front to a 17t or so to get longer gear ratios... the bike will get some boyesen dual stage reeds, some porting work and an expansion chamber made by a guy who used to race a dt125 (lives around the corner from me!) probably also a mikuni 28mm flatslide... so got 2 bikes, a 75 and a 79 *(parts) first pic is how it came second pic is strip down and new tyres third pic is how it is now - needs silencer, chain guard, and indicators and brake light switch etc etc etc to get on the road motor is ok, good compression but think the crankcase seals are bad, thing is smoky as hell with autolube disconnected so must be sucking gearbox oil.. that and the mikuni needs a rebuild kit (leaking) probably needs float height set etc... magneto - with points - never been set - this will be the plan over the next few days... the bike may just need to be run to clear all the old oil out of the crank case...

hey im ed i'm a 24 year old uni student just about to buy some yamaha ag 175's for fun project to rebuild / cafe I love 2 strokes, and up until now have been a Puch guy (1950s split singles) keeen to get stuck into a resto/modifcation project on these ag bikes if anyone needs any parts I wil surely have a bunch left over. cheers ed

Edit: hey all this is going to be my ag 175 resto/cafe racer thread enjoy