[greenducky55]

Well 99% sure it’s the valve stem seals after picking some brains. Going to hit up RC scooters and Drow sports for the parts. Partially tempted to order a nicer taiadia head with 24mm/23mm valves vs 23/21mm and my cheaper one as they are the top tiers of heads but realistically it would make more sense to just have mine cleaned up/polished.

I also sent out to a quote get a few sprockets made out of 4140 steel and zinc plated. But also asked if they had another recommendation for my needs/uses hopefully hear back soon.

That’s it for now.

 

[greenducky55]

Ordered everything today.
Valve stem seals were $4
Gasket set was $12 ea so I ordered 2
Ordered another piston and ring set for future needs of it arises $90 so not bad

The pain is the new cam sprockets Contacted a few different places to get it done out of 4140. Heat treated and zinc coated. Also ended up making the sprocket slightly thinner to help with a smoother chain action. The setup is the pain each sprocket is only $20 but having to pay $400 in setup fees sucks. Oh well I’ve spent way more than that at this point 😂

have parts coming from Taiwan and then the machine shop so probably 3 weeks from now before I get to make any progress. Oh well it’s been like 5 years at this point.

 

[storminnorman07]

Whats the reason for having it zinc coated?

 

[greenducky55]

Whats the reason for having it zinc coated?

I was sending out a bucket of parts to be coated anyways so was thinking about sending them with it. Would it be detrimental or just more of a waste?

 

[greenducky55]

Clips of it running

First Start

232cc TTR125 4 valve first start.

Finally got the 4valve big bore TTR125 started!Details:74mm bore (20cc over) 54mm stroke for 232ccLightened flywheelLightened crankRemoved counterbalance sha...

youtube.com

Running and little rev

232cc TTR125 4 Valve Head running - GingerSnap Racing

Little bit of a older video. I thought would be fun to post as I’m busting out the TTR again to get it dialed in hopefully. 74mm bore54mm strokeLightweight c...

youtube.com

First Ride (too rich and some clutch slip) limiting speed. Also stock ECU with its really low rev limiter.

 

[greenducky55]

Got the majority of the parts in just waiting on the new cam sprockets. Got the cost down by switching back to waterjet cutting of 1/8” 4140, then when I get it home I’ll do a slight chamfer on the teeth on my lathe. Then do some heat treating. Was able to drop the cost from $400 to $200 doing this instead. Skip the zinc coating as well.

 

[greenducky55]

Today got my new silencer mocked up. I need to weld the reducer piece in place but first I’ll pull the shock and cycle the rear wheel so I can make sure everything clears the new silencer since it’s bit bigger than the old one. I loved the sound and look of my old one but it was just way too loud.

 

[Hetrickson]

Man I wanna be you when I grow up lol. Wild.

 

[greenducky55]

No photos today but progress none the less.
got the intake valve seals changed without pulling the head doing it kind of red neck but it works. Rope in the cylinder through the spark plug hole and then turning the crank until I have pressure on the valves.

I used a 12mm wrench to push down the retainers and a magnet to remove the collets. Reverse to reinstall. Old seals are a bit hard so that was probably the problem. Need to do the exhaust still but I might have to pull the front end to get a good angle to work on it.

still waiting on the new sprocket before I can really fully re assemble. Was hoping to test it this Thursday but probably won’t happen I rather wait for the new sprocket than use my extra SS one.

 

[greenducky55]

Well the shop contacted me and said they had their material pricing incorrect and it went from about $250 to $580 for the sprocket. So I’m currently reaching out to some other places for other options. I could save some cash by going 4130 but unsure of how long it will last. Hopefully hear back soon from the 20 other places I reached out to and go from there.

 

[storminnorman07]

If you have a shop that case hardens you can use the 4130. If not 4130 is still going to be to soft for the application.

 

[greenducky55]

If you have a shop that case hardens you can use the 4130. If not 4130 is still going to be to soft for the application.

Yeah that was my concern from when I looked at it before and nobody I’ve talked to locally wants to touch the small batch I need in 4140 as they would need a full sheet which is expensive. I have one guy looking around for scrap pieces at other local shops. But it’s kind of a long shot.

I have a sheet of 4130 so a local place was willing to laser cut it for a good price but losing out on durability doesn’t sound like the direction I want to go.

4140 seems like the best of my options to get it cut from sheet. Anything stronger just doesn’t come in .125” and would end up in a cnc mill instead bumping the cost pretty significantly. And I’d have to pay for programming as I only have a 2d design.

Unless you’ve got any other ideas I’ll just save up a little more and go 4140 and get a few of them.

 

[storminnorman07]

Do you have a print of the gear? If you do and don't mind shooting it over to me an email I can put in a couple calls with some homies and see if I can't get a better price. You're looking to do 20 of them right?

 

[spiz5]

Holy shit, can’t believe this is still going on. I’ve lost and regained interest in my bigger mini several times since you started this. Keep it up, I admire your determination.

 

[greenducky55]

Holy shit, can’t believe this is still going on. I’ve lost and regained interest in my bigger mini several times since you started this. Keep it up, I admire your determination.

Haha yeah I feel you on the losing interest MANY times. I went too far trying to do EFI and got discouraged with it after it started burning oil and the carb float failed so it sat for over a year. Problem is I put too much work all at once instead of taking my time so I get fustrated 😂. It’s finally in the final stages once this gets sorted. I’ll ride it for a bit, get some heavier fork springs. I need to weld some reinforcements around the shock mount, And once I feel like it’s dialed I’ll tear it down one last time for powder and cerakote.

so maybe next year or two at the current rate. Haha

 

[greenducky55]

Well found a good local shop to do the sprockets out of 4140 for a reasonable price. ETA 3 weeks or less so hopefully running by the end of the year.

 

[greenducky55]

Got the call yesterday that the sprockets are complete. Unfortunately I just won’t have the time to make the drive to pick them up until the 3rd with the holidays and work going on. But at least it’s not a waiting game for parts anymore. Right now my 2stroke is torn down to the frame so I wouldn’t be wrenching on the TTR anyways. But come the new year it’s on like donkey Kong!

 

[storminnorman07]

Oh sh!t so it won't be long now

 

[greenducky55]

Oh sh!t so it won't be long now

Yes Sir!!!! Really excited to get it done fingers crossed I actually sorted out all of the problems.

 

[greenducky55]

Just picked up the goods. Expensive but finally the good stuff.