[Lotus54]

I picked up a 72 175 Enduro a little while back. I’ve been slowly working on it. It had sat for 5 years before I got it. I did get it fired up and ran ok, but then started running really rich (bad float needle).
I also noticed a fair amount of carbon on the exhaust port, to popped off the head. Piston/head was suspiciously clean. I think someone cleaned it off.
I then decided to pull the cylinder, which took a little bit due to a stuck cylinder stud (cylinder won’t clear frame with them on). But I got it in the end and it looks pretty good overall.

the original SanRemo steel rims were very rusty- so I sent the hubs to Buchannan and had some Borrani alloy rims and stainless spokes/nipples loose laced. Yeah, the wheels are now worth more than the bike.
Shocks are shot, but happened across some Curnetts and installed those- they even had springs almost exactly the same orange as the bike.
I have a taillamp working, but nothing else, so time to sort the electrics.
I also am replacing the crankshaft seals, since so many of my vintage 2-strokes have those leak. It is a pretty easy job to replace and I needed to replace points/condenser anyway.

I think it will be a pretty fun bike for the use I plan for it. I always wanted one for some reason. I know they are not really that great, but I still like it.

 

[Lotus54]

I’ve pulled the engine- decided to just go through it all now. A lot is off already, so not that much more work to just pull it apart and make sure all the bearings/seals are good.
I will try to remember and take pictures.

The plan is to get it done by spring. But I want to finish a 65cc mini engine I’m doing first. I don’t like too many things going at once if I can help it. It is almost done, so shouldn’t be long before I split the cases on the 175.

 

[Lotus54]

 

[SPEIRMOOR]

Nice Enduro 👍
I have one also and yours may be missing a piece on the tailpipe ?

 

[Lotus54]

I have the missing baffle- I took it out when having some odd running issues and though maybe it was clogged.
After checking a bunch of things, it was ready to split cases. So I just popped the engine out and will go through it.

 

[Lotus54]

I split the cases on the 175. The countershaft sprocket was a bugger to get off. the key was sheared, but I’m not sure if I did that getting it off, or if it spun and part of the reason it was so difficult. The shaft is tapered also.

I did a quick vaporhone- I will go back and get any places I missed. Since it had water in the oil for who knows how long- there is some corrosion on the lower parts of the case. But should be fine.

 

[Lotus54]

 

[Lotus54]

I now have all the gaskets, seals, bearings- except for the small end connecting rod bearing. No luck yet.

I will start to reassemble. I do have one someone gave me that is a little longer and possibly could be trimmed to fit.

 

[Lotus54]

Starting to reassemble. When cleaning the kickstart shaft I saw some splines were damaged. So I ordered a NOS ($17 US). That will delay assembly awhile, but should only be a few days.

 

[Lotus54]

Better detail photo.

 

[Lotus54]

Cases are together.
Next bolt it all up, then install clutch/primary gear.

 

[Lotus54]

Clutch, flywhee etc are all on.
Installed cylinder studs- the Snap-On tool works really well.

 

[Lotus54]

I fit the Vapor ignition/charging.
So I had to time it. Specs call for 26º and gave distance on flywheel. The Vape is smaller, so I first transfered over, then checked with degree wheel.
The degree wheel setup was just a quick mock up before I did a proper ‘pointer’ to double check what I did. Then I measured the mm BTDC so it would be easier to set/adjust if needed.

 

[Lotus54]

 

[Lotus54]

I was preparing to torque the head nuts, then discovered I could find no torque specs in the manual.
Maybe I missed it, but if anyone knows what they are supposed to be, please let me know.

I can make a pretty good estimate, but rather do it to spec if I can.

Making the wiring diagram and a new simple harness (keeping the stock one intact). Since using the Vape setup, I’m leaving a bunch of stuff off and no battery. I plan on still using original key for kill button and maybe headlamp/taillamp switch. Or I may just have them on all the time and just have a hi/lo switch. I was thinking it would be sort of neat to you that switch with the key- but may change my mind. I have a spare headlamp housing with key etc- so will still have original entirely intact.

 

[Lotus54]

Engine in, new wiring harness made up and done. Getting closer.

 

[Lotus54]

I’ve been doing short rides. Still have to sort an air filter (I have original, but someone put foam in there and it doesn’t work that well), mount the skid plate and get the speedo working.