sdm

You can also look for a clutch basket for a 76 or 77 DT100. I got one on ebay. Same part number that you have listed. I used one on my Ty 175 a few years ago and it was fine.Than part number may cross over to other models but I haven't dug that deep. Both the baskets I had had play between the basket and the driven gear but that seems to be a common thing. I never had any clutch issues because of it.

Sounds pretty normal to me but I may be missing exactly what you are hearing. Might have a bit of piston rattle but not unusual imo. The cylinder fins can make any noise sound louder some times. Also try pulling the clutch in at idle to see if it changes. You might be hearing some primary gear noise..

Hi jberg98n... curious as to who you finally went with for a rear sprocket? I am trying to do a similar thing for my 63 C15s and need to re-gear it in a big way.Also what size sprocket do you have on the gearbox end? Thanks Sam

I have gotten my bearings from Speed & Sport for my Cota. Matt has a nice website and can fix you up with bearings and seals. Also he is here in Cali and caters to the vintage bikes of all types. www.speed&sport.com

They are a bit notchy or stiff to shift compared to other bikes. An easy thing to check is to make sure that you are getting full travel from the shift lever in both directions without any interference of the lever with the engine case or anything else. Sometimes they can get pushed out of shape in a crash and interfere with other parts. Also the shift shaft is connected to linkage that goes to another main shift shaft behind a small cover . It is on a spline. If the linkage or spline is worn, it could cause the trans to only partly engage a selected gear or popping into a neutral. I assume you were at Bushey Ranch? Sam

Also check to make sure the exhaust isn't partially plugged with carbon somewhere. That could cause the symptom you describe also and seem to run ok at low throttle.

If the po was running premix the oil injection is probably not hooked up. The stock throttle cable is a split cable with one end going to the carb and the other going to the oil injection pump. If you take the oil pump cover off(right side front of the engine) you can determine if the oil injection pump is still connected. I believe Yamaha calls for 10w 30 engine oil for the tranny and allot of people use ATF. I would use a good quality motorcycle oil 10w30 like Yamalube. Matt at Speed and Sport can help you with all your other questions and probably has the parts in stock. He is a good source for all vintage Yamaha stuff and has a good web site. I think he has manuals also for your bike. www.speedandsport.com He has done allot of the Domino/ throttle cable conversions for the TYs and may be able to send you what you need from memory or tell you what he needs for measurements.

If I'm not mistaken your piston looks to be 2nd oversize over stock. The correct procedure to do would be to measure (or have it measured) the cylinder bore at different spots to see how much taper or out of round it is. A shop manual will give the correct specs for measuring.That would tell you for sure where you need to go as far as a rebore and oversize. If the engine runs very rattly also check the main bearing play by trying to wiggle the crankshaft flywheel.If you detect any movement you will probably need main bearings... and while you have the crank out might as well have a new rod pressed in for good measure. You don't want to do any work you don't have to obviously but don't short cut it either.. Sam

Yes they can be changed without splitting the cases. You will need a magneto flywheel puller for the magneto flywheel, and a good stout puller to pull the primary gear on the clutch side. There are seal housings that unbolt from the main engine cases making seal replacement very simple. Sam

Like Turbo said some pics would be helpful.. I replaced the clutch basket with one off a DT100 which is basically the same as the TY 175 and I got it used off of Ebay. Mine is a 76 TY and the driven gear on the basket is the same as the 77 DT100 with minor differences. The only thing is the replacement basket I got off Ebay has the same slop in the gear between the basket and gear that the old one had. I figure I will just run it and assume it is suppose to be that way... Sam

Always good to resolve a problem on these old bikes. They all seem to have little hidden issues for various reasons ...

Wow ! Very nice Rock...I like the yellow and all the bits you added. I didn't know the RD 350 inlet boot would work on the 175 so that will be a good resource to look for. Did you use the stock air box and carb to airbox boot? Sam

Mine looked like that about 2 months ago but is up and running now.. Love the bike and plan on doing some vintage trials soon. The cool thing is parts are available out there if you have some good bones to start with.

Yes it does which I hadn't planned on but is nice. I no longer slam my heel into the foot peg when kicking!

Yes I did drop the foot rests some.. I was too scrunched up with the stock position and dropping them improved my riding position (for me) quite a bit. The rear brake pivot kind of dictated what I could do but in the end I like the results. I also dropped the brake pedal pad some with an extension that I welded on. Looks kinda cobby but it works well. Sam

Here is my 76 175 that followed me home after an event... I just got the engine back together after sending the crank out for a new rod,mains etc and a fresh bore and piston. A friend did a nice job on the tank and exhaust guard and I resprayed the frame. Lots of small bits to get it back to reliable running and I have about 2 hours break in so far. Loving the light weight and handling.

I finally got a pic of my 74 247 Cota that I ride regularly in AHRMA events. It has been good to me with the exception of things I have done.

I assume you have already tried Southwest Montesa in Arizona and Matt at Speed & Sport in Calif....

A little trick I use to minimize the flash rust is, after you flush the tank with hot water and get it as dry as possible, spray the inside of the tank with WD40 and slosh it around. From a spray can it will make a fog inside the tank and get to all the nooks and crannies and also displace any moisture that is left in the tank. I have used this method on 2 tanks with good results but you have to be quick to spray the WD40 as soon as you think you have the water flushed. The only problem is you will have a film of WD40 so if you are going to use a sealer of some kind you will have to remove the WD40. I also have been using a product called Evaporust. It is non toxic and designed to remove rust in gas tanks and on tools etc. Good luck Sam

For anyone that may be looking for a carb to airbox boot for their TY 175, I have sent my old original to Clauss Studio for them to use as a pattern to make a new one for me. When I get the new boot back I will report here and let you know how it works. Sam

That's what I was thinking but didn't want to start pounding away on things without checking with more experienced folks. thanks Sam

I am doing a full tear down on the engine on my TY175 and have noticed that the gear on the clutch basket has what seems to be quite a bit of play in the direction of rotation where it rivets to the basket. This doesn't seem normal to allow this much play so I am wondering if there is a standard fix for this or am I being overly cautious?

That's what I am hoping if they don't have a specific boot to fit. The one I have is ok to use as a template but just has a tear that has been siliconed over. Thanks

Tried Matt at Speed & Sport first and no luck... I have an email in to Clauss Studios in So Cal and am waiting to hear back. They make all kinds of reproduction rubber parts so maybe they have something that isn't listed on their web site. Thanks petert Sam

Just picked up a 76 TY 175 and going through it to see what it needs. The airbox to carb boot has silicone covering a couple cracks so I would like to find one that is in better shape. Does anyone know of a source for these? I have done the usual searches on the search engines and also most all the vendors but nothing comes up for this application. The boot off a 77 TY 250 has the same size openings but is configured differently with different bends. Ebay has nothing that I see. Yamaha part # 525-14453-00-00 Thanks Sam