Jog-Mania

[tsimi]

The good news, she's ALIVE! After approx. 10 kicks she fired up and idles steady.
I used the exact same carb and CVT setup as I did with the Polini Sport engine.
That was the good news. The bad news;

- My head and tail light are very, very dim or not shinning at all when engine is idling. And when driving the lights are working but rather weak. Stator issue maybe? Where should I look?
- Compare to the Polini or even stock engine this one lacks bottom and mid-range punch. It feels similar when advancing the timing, higher rpms but no punch. No way you can get the front wheel up like that.

I will revert back to stock CVT setup to see what will happen.
Here a comparison from 2 stock varios one from a normal Jog and the other is from the legendary 7.2 hp Jog. As you can see the drive boss is bigger and the vario has a flat inner area. Curious to see how it will perform.




To be honest I did not measure how much fuel was inside the tank, I just know that I added around 3 liter few days ago and added 100ml 2T oil into the tank so I might be running with a bit too much oil at the moment.
The other thing I think might be an issue is the carbs Jets. I think I have to rejet since I run premix now right? Kinda feel slugish at 1/4 - 1/2 throttle.

I guess I am not done with this engine yet....

If you know what causes the light issue please let me know. And if you have any hint or advice to get this cylinder better running I am all ears.
I will order a new 12mm MHR Rep piston soon now that I know the engine runs that might fix some of the issues?

[tsimi]

06jog

Sorry but I have no experience with Airsal stuff. I was also thinking about a couple of times already to get one of those since they are really cheap but I have no clue how good they perform in comparison to Polini or Malossi.
Maybe spaz12 or Lucass2T know more?

[spaz12]

May 14, 2016 7:20:36 GMT -5 tsimi said:

The good news, she's ALIVE! After approx. 10 kicks she fired up and idles steady.
I used the exact same carb and CVT setup as I did with the Polini Sport engine.



That was the good news. The bad news;

- My head and tail light won't are very, very dim or not shinning at all when engine is idling. And when driving the lights are working but rather weak. Stator issue maybe? Where should I look?
- Compare to the Polini or even stock engine this one lacks bottom and mid-range punch. It feels similar when advancing the timing, higher rpms but no punch. No way you can get the front wheel up like that.

I will revert back to stock CVT setup to see what will happen.
Here a comparison from 2 stock varios one from a normal Jog and the other is from the legendary 7.2 hp Jog. As you can see the drive boss is bigger and the vario has a flat inner area. Curious to see how it will perform.




To be honest I did not measure how much fuel was inside the tank, I just know that I added around 3 liter few days ago and added 100ml 2T oil into the tank so I might be running with a bit too much oil at the moment.
The other thing I think might be an issue is the carbs Jets. I think I have to rejet since I run premix now right? Kinda feel slugish at 1/4 - 1/2 throttle.

I guess I am not done with this engine yet....

If you know what causes the light issue please let me know. And if you have any hint or advice to get this cylinder better running I am all ears.
I will order a new 12mm MHR Rep piston soon now that I know the engine runs that might fix some of the issues?

It sounds lean to me Tsimi.
Not sure about the lights issue either. Maybe a loose wire somewhere?

And before you order a piston you should check the compression and then tear it down and look at it again. See what ya see.
A new piston might make it much better because the one you have in it now is not meant for that cylinder. Then again, it might do nothing? Fark, I don't know what to tell ya.

[spaz12]

May 14, 2016 7:26:53 GMT -5 tsimi said:

06jog

Sorry but I have no experience with Airsal stuff. I was also thinking about a couple of times already to get one of those since they are really cheap but I have no clue how good they perform in comparison to Polini or Malossi.
Maybe spaz12 or Lucass2T know more?

When I hear/read Airsal, I think of the T6. I'm not sure if they even make it anymore, but people raved about the power and durability. That's the only thing I know about Airsal. I'm sure Lucas or someone else will know more.
Lucas probably won't be on for a couple more days though since he's out having fun on a 3 day scoot journey.

[06jog]

May 14, 2016 13:56:04 GMT -5 spaz12 said:

May 14, 2016 7:26:53 GMT -5 tsimi said:

06jog

Sorry but I have no experience with Airsal stuff. I was also thinking about a couple of times already to get one of those since they are really cheap but I have no clue how good they perform in comparison to Polini or Malossi.
Maybe spaz12 or Lucass2T know more?

When I hear/read Airsal, I think of the T6. I'm not sure if they even make it anymore, but people raved about the power and durability. That's the only thing I know about Airsal. I'm sure Lucas or someone else will know more.
Lucas probably won't be on for a couple more days though since he's out having fun on a 3 day scoot journey.


it would be lean by what ever the percentage of oil you pre mix as it takes up part of the fuel to air ratio. You still need to break it in too don't you.

[06jog]

May 14, 2016 7:26:53 GMT -5 tsimi said:

06jog

Sorry but I have no experience with Airsal stuff. I was also thinking about a couple of times already to get one of those since they are really cheap but I have no clue how good they perform in comparison to Polini or Malossi.
Maybe spaz12 or Lucass2T know more?

Thanks for your reply anyway. It is a cast cylinder not the alloy T6. It does not work out much cheaper than the stage 6 when it was on special.
i am more interest in this as it is not a high revving combo and I can run the stock carb with an up jet.

thanks

[tsimi]

06jog

I tried to premix at 32:1 but this was my first try and I didn't had the exact amount of fuel inside the tank so it was more of a guessing.
I think it will get better when I need to fill her up next time.

[tsimi]

Currently the oil pump and electric starter wire harness are not connected could this be the cause of the no light/very weak lights issue? Or doesn't that matter at all?

[spaz12]

May 14, 2016 19:32:10 GMT -5 tsimi said:

Currently the oil pump and electric starter wire harness are not connected could this be the cause of the no light/very weak lights issue? Or doesn't that matter at all?

The oil pump no, but maybe the starter? I don't use my starters but I left them hooked up (minus the clutch) so I'm not sure.

[birdman]

06jog
I had a T6 before on my vertical jog motor. I seized it on my first real ride. At the time I thought it was a cheap cylinder but now I thing I just wasnt careful with the tune and got too anxious to go ride. It was powerful cylinder though I may try one again one day. Everything deserves a second chance.

tsimi
Im glad you got it running but as far as the electrical issue Im clueless. then with the performance problem, I would do as you are... Start with the stock cvt set up and the base carb settings that I think Pig or corrosion recommended awhile ago. then take it from there. Also what pipe are you using again?

[tsimi]

birdman

Using a V8 pipe. That is sure also a performance killer since it won't allow high rpms but it should give me decent bottom punch. Like you said back to the roots with the CVT and jet the carb exactly as corrosion recommended and see what happens.

spaz12

I don't use the starter but I remember in the past when I forgot to connect the earth wire to the CVT case it caused some issues so I'll try to put back on again.

[birdman]

oh yea ground wires are crucial.. In automotive electrical class the teacher always said that "80% of all electrical issues can be traced back to a bad ground"

[tsimi]

Today was a very good day with good results and a lot of learning.

First the light issue. As I thought the starter wire harness has to be connected and the ground wire needs to be attached to the engine case. In the image below you can see that harness (red line) and the blue arrow shows the ground wire.



I believed that if I don't use the starter motor I could leave the harness out but I was wrong the ground wire is part of the whole circuit. The other wire that usually gets attached to the starter motor can be left as is, no need to attach it anywhere.
That fixed the lights and now they shine nice and bright even at idle.

Regarding the cylinder having no punch at the bottom and mid-range. Before reverting all back to stock CVT I thought I give this following a try. I added another 0.5mm washer to the vario to get a bit more clearance between the halfs and that gave me a few hundred rpms more. Now when I drive and reach 8000-8200rpms that thing starts to pull like a real beast! Unbelievable how much power it can put out once the "right" rpm is reached. It was foolish and stupid of me to believe that a mid-race cylinder like the MHR Rep would output power at low rpms like 4000-7000. Now I know I need to get those rpms up as quick as possible at take off and then I should be flying in no time. Red racing CDI + Polini Evo vario + stiffer clutch springs should do the trick and keep me at 8000+ rpms from the start.
Now I definitely will get me a 12mm MHR Rep piston to be on the safe side. Did a couple of longer WOT runs and all seems to be running good, no weird noises, no lean condition anymore.

[spaz12]

Just imagine it with nice and smooth cylinder walls. It really pulls when they're fresh! Now you need a C16

Maybe Lucas can find you a nice used C16? Just a thought.

[tsimi]

Came home from work and found this in my mail. 






THANKS ryan_ott !