4G T-Belt Transmission (Honda)

[chrisnbush]

Hey, in case anyone still hits on this - I recently got the Dax "super titan" and am really happy with it - running with the Grubee 4g, the one with the 11 tooth freewheel. I suspect that it matches up more closely with the torque of the Honda. Don't know what Duane did to it - or HuaSheng but it is noticeably more powerful (now to see how it holds up (!), I have 530 mile on it now).

I bought the new motor after I blew up my original standard HuaSheng, also from DAX racing a bicyclist (and losing). At that point, I had 744 miles on the 11 tooth freewheel, so now I have 1274 miles on the freewheel. Still looking good (knock on wood, my head maybe) what I have been doing is feeding it Triflow oil (the liquid, not spray) via an insuling needle my friend gave me, which I epoxied to the delivery straw that comes with the Triflow product. I just squeeze it drop by drop into both cracks in the freewheel, left and right side of bike. Waiting for bikeengines to get more freewheels so I can get a spare, probably going to have one welded just for a sure thing. Here's hoping

 

[Irish John]

Chrisnbush, the best thing to do with the 11T freewheel is to completely dismantle it and rebuild it adding thick grease to the inside. You need to keep the grease off the threads because they need to be clean so you can put red locktite threadloc on them. When it is reassembled and installed you need to leave it for about 2 days to set. That way thefreewheel will hold together until the teeth wear out ar 4000 -5000 kms.
Like with a lot of Chinese components you need to totally rebuild it if you want it to function properly.

 

[chrisnbush]

Thanks Irish John, that is a big help (particularly the thread direction on taking it apart, and the grease - looks like some kind of spanner wrench would be appropriate here ?).

I will pack it with grease. I read about the loctite, I had the bolt spin off a couple of times when I first got the 4g, put a big split washer on it and haven't had a problem since then. The problem I have had with loctite is that if I don't get the metal completely clean of any oil they spray on, I guess as a rust preventative, it doesn't hold well. So, even if I think the metal is clean enough, I don't trust it. But I probably walk more than you do...

Hey, there is a product called Tufoil - it is suspension of PTFE (teflon) particles. Slippery stuff - I swear by it in my cars, e.g. got 160+ miles on my little Tracker 1.4 liter motor, and it was still running strong (and not burning oil) when I sold it. They make a treatment size for small motors, I have it running right now in the HuaSheng. Posting it here in case you have had any experience with it, anyways I want to see how many miles i can get on this motor

Regards

 

[Irish John]

Yeah Chris, you need to undo the freewheel with a small centre punch. There is probably a special tool for the job but I haven't seen one. When you do it up again make sure it is tight as can be. I don't get the threads totally oil free but the threadloc seems to hold really well. If your 4G gearbox puts too much torque through the shaft then you might have freewheel problems. I gave up on the 4G just after it came out and I tried one to see what it was like. I was very critical about the 4G very early on in a thread I posted and attracted lots of nasty abuse from MB members but I was proved absolutely correct over time. The newer 4G with the smaller pulley wheel is still geared all wrong. The older Mark 2 GB is a better GB but they stopped supplying it because they knew it was better than the new one. I wish Don Grube would stop experimenting and just find a disused aerdrome near his home in China where he could actually ride his inventions to see if they do or do not work.

 

[ibdennyak]

John, I also appreciate the tutorial. I am putting a lot of torque through one, and am concerned about longevity. Already had a few problems with it freezing in winter.

Rhetorical question.....wouldn't it be possible to add a few more ratchets and machine the center to beef it up?

 

[Irish John]

John, I also appreciate the tutorial. I am putting a lot of torque through one, and am concerned about longevity. Already had a few problems with it freezing in winter.

Rhetorical question.....wouldn't it be possible to add a few more ratchets and machine the center to beef it up?

It was because they found out that the 11T freewheel couldn't cope with the increased torque that they changed the 4G Mark 2 to a 10T rigid sprocket. The 10T rigid is too small and Grubee knew that but what the heck they are plentiful because the 2-strokes use them so why go and get one specially made.
To justify this piece of logic Don Grube said ' well the old GB was making the bikes go too fast and that is dangerous etc. as if he really cared.
The very old 11T freewheels were actually more robust than the later ones but they must have been the victim of quality fade.
I reckon it would be easier to source an 11T freewheel that could be adapted than to include more ratchets (pretty impossible) or machine the centre to beef it up (don't really understand quite how).
What I think a person of moderate integrity would do is to get the 11T freewheel made of better material and certainly better assembled before throwing all that stuff together in kit form.

 

[ibdennyak]

Yeah, that's kind of what I was getting at John. I don't mean modifying an existing one, I meant having one manufactured with 4 or 6 of the little pawls. I tend to overbuild stuff, and I guess *planned obsolescence* doesn't quite fit in my scheme of things.

Guess that just makes me an olefart, and out of touch.

 

[Irish John]

Yeah, that's kind of what I was getting at John. I don't mean modifying an existing one, I meant having one manufactured with 4 or 6 of the little pawls. I tend to overbuild stuff, and I guess *planned obsolescence* doesn't quite fit in my scheme of things.

Guess that just makes me an olefart, and out of touch.

I'm the same as you.
Our day will come!!