spydey98

Good points oldgitonabike and 2 wheels. I definitely shall replace the seal for good measure...and no, I haven't check the seal on the back of the oil pump. I'll do that this morning after I clear a few things up at the shop. Now that you mention it, the transmission oil did have a bit of a blue hue to it. You might be onto something there 2 wheels: haven't checked the exhaust for blockage but was thinking about that myself last night. The theory on not enough oil in the mixture may be correct if some of it is leaking into the transmission oil. The HT lead is good, checked that first along with other peripheals. Thanks guys, I'll keep you posted

Good points oldgitonabike and 2 wheels. I definitely shall replace the seal for good measure...and no, I haven't check the seal on the back of the oil pump. I'll do that this morning after I clear a few things up at the shop. Now that you mention it, the transmission oil did have a bit of a blue hue to it. You might be onto something there 2 wheels: haven't checked the exhaust for blockage but was thinking about that myself last night. The theory on not enough oil in the mixture may be correct if some of it is leaking into the transmission oil. The HT lead is good, checked that first along with other peripheals. Thanks guys, I'll keep you posted

Hi guys, thanks for all the responses. Oldgitonabike: No movement in crank, yes to the exhaust blocked off. I'm as baffled as you are. 2 wheels: Yes it still starts and runs. Starts easy, pretty much first kick everytime..UNTIL it starts that bogging down and smoke routine. Vez: I'm at the point where I'm ready to agree with you about the heating up issue...but after 2 hours of riding??? It seems to me that it would rear it's ugly head long before that. Does anybody agree with that?

I see your point, but as of right now I have the clutch side cover off so I have a direct visual of the crank seal. I've put oil around the seal and pressurized and there are not bubbles from the seal and the air does hold in the cylinder.

Normally I would agree with you, however, when I took it apart I examined the sealing surface (metal) and it is pristine...and I'm not exagerating on that...it looks perfect. you can't even feel the tinyest scratch either. I'm an automotive and marine technician, so taking from that knowledge I decided to pressurize the cylinder with air (much the same way we test marine outdrives for leaks), and no air escaped except on the exhaust stroke through the exhaust.

No, same issue, bogging down and white smoke. This is where it's baffling me. The seal is in it's place but the same symptoms occured. Last time it was blatently obvious...now???

Ok, so I got it opened up this morning but the seal had not popped out???? It's still in there. Good compression, ran fine for a couple of hours and then...started bogging down. Any ideas on this one?????

Hello everyone I'm having a hard time finding points and a condenser for my DT175. Does anyone know a source for these? Thanks

Well, finally going to get the time to get at that seal today. I'll keep posted on the results. I did verify and it is indeed the correct seal.

I wish I had that. So, I pushed the seal back in and it ran fine for about 2 hours. After that you start to to see the tell tale white smoke begin and the motor started bogging down...so...here is my dilemma. Does anyone have any suggested sealants I could put around the seal when I push it back in? Anybody had this problem before and found a fix? Thank you, any input VERY much appreciated towards a fix as I don't want to do this every 2 hours of riding lol Jesse

Hey guys, Indeed the clutch side crank seal...however...it wasn't because it was worn, it had popped right out. Didn't have time to check the bearings as the day was over and I was pretty tired. I'll check them in the morning and see if I can figure out why it popped out. It definitely had some work done in the past couple of weeks. It was spotless in there and the seal did look fairly new. Cheap seals maybe???? Thanks for the input.

Hi everyone, So, earlier today I bought a GT80 for one of my kids for about 300. It looks great, has great compression, no major leaks. The kids were riding it around today at the farm and it was going great!!! I mean this thing really pulled for a 30 year old bike. Anyways, after about 30 mins the thing started blowing whitish smoke out the tail pipe and bogging down after we put it in gear and pulled away. In neutral it will rev up, but not in gear. Any ideas??? My kids are really hounding me on this one...they love the bike (we have two others of different years). Thank you in advance.

Hi guys, New to this forum...my name is Jesse, I own an automotive shop in B.C., canada. Love this group, I own a few Yamaha's and this has been a great place to browse around and read up on all sorts of topics. Anyways, my question is this...does anybody know what the compression numbers should be on a DT175C? I've recently acquired one and can't find the numbers anywhere Thanks in advance for the help.