Jog-Mania

[moofus02]

Dec 28, 2015 19:53:37 GMT -5 spaz12 said:

Dec 28, 2015 19:46:12 GMT -5 moofus02 said:

No snow riding with those but I could ride with slicks where I live and no one would even care

My friend rides with them on his sport bike and from behind while it's rolling you can't tell. He says he just tries not to stop in front of cop cars and he's done a good job of doing just that for the last two years 
I wonder if it would be a fine, or a fix-it ticket? Or prison!? 

They would chew you out and tell you the next time they see it it has to have tread or they are impounding it lol

[spaz12]

I think I might try that some day.

[tsimi]

Finally installed the 19mm PHBG carb today. Man what a PITA to hold the spring back while fiddling the cable through the hole inside the slider.
Kick started the Scooter and she fired up. So far, so good. Idle is steady and good. Just needed to screw in the idle screw a little bit to adjust. Played a bit with the throttle handle to see if it responds well and also if I can get WOT, here too no problems. The only thing that disturbs me a bit is the throttle wire movement. I can crank it open but it won't go as smooth as I would like back to its 0 position. Maybe it's just me...
Another PITA was the choke cable. The Stage 6 50cm choke puller came with a wire pre-installed and the wire was a bit too long but I could use an additional adapter between the bendy and the wire cover end.

Questions:

1.) What the hell is that manual choke for anyways? The Scooter starts without pulling it.
2.) I am a bit nervous regarding the Jetting. It would be really too bad if I would seize the BBK now after all that engine swap work. So I would like to know the Jet settings you guys have ever used with a 70cc BBK and a PHBG 19mm carb. My current setting is PJ #40 MJ #100

Tomorrow I will go for a test drive and see what kind of performance increase I got with the carb upgrade.

And again, pictures!

[90GTVert]

1. The manual setups are way nicer than the auto stuff, for me at least. I have a lot easier time with starting in the winter with them than I ever have with an auto enricher. If you don't think it does anything, pull it and it should start running rich at idle if it's working.

2. If you're nervous, there's no reason you can't start big. If you go too big it'll sputter and be obvious. Just work your way down. 100 is probably a good starting point. I think the biggest jet I've ever used in a 19-21mm PHBG is a 110, most are 95-105.

[tsimi]

Thank you Brent.
So that is what the choke is for. If I can't get the engine started I just flip the switch and it should start. That explains why it started to sputter and die when I flipped the choke switch while the engine was running/idle. Meaning the choke is actually working properly.

I will ride with a 100 MJ tomorrow and see how it goes. I don't have the quick access float bowl to swap main jets so I hope I can find the right MJ as quick as possible.
It's a PITA to remove the carb enough to access the MJ.

[90GTVert]

Yeah, it will enrich the mixture for cold starts. You need fuel vapors for combustion, and you'll get less vapor from fuel at low temperatures and with cold surfaces. Adding more fuel, in excess of what would be a normal mixture for a hot engine, increases the amount of vapor.

Take good notes when you tune and it will help you find the jet that you want more quickly. Speed, RPM, weather conditions, feel and sound observations, and noting how the plug looks if needed should all be useful. I keep as many panels off as possible till I know it's in tune to speed the process. No sense in buttoning it up just to take it down the road, unless you can't have proper lighting or something along those lines without all panels in place.

[tsimi]

The panels are no issue I will keep the side panel open for easy access. I am more thinking about the intake and airbox, both very, very tight fits and not easy to put in and out. I could loosen the whole intake (4 screws) and get the carb to move enough to reach all of the float bowl screws from below.

[spaz12]

Tsimi, your choke lever will come apart so that you can adjust the length of the cable. You have to be careful not to cut it too short though because it will make it really hard to move the lever and a good chance you break it (just the handle).


Comes apart here:

[tsimi]

90GTVert

Brent, what size of pilot jet do you usually go with on a stock airbox without snorkel and 70cc sport grade BBK?

[90GTVert]

I believe around a 40.

[tsimi]

Went for a test drive.
Now I know why you guys can make wheelies. Brutal power from the start. I didn't expect that much power improvement so the front went right up and I quickly hit the brakes to avoid crashing the scooter into the gate.
After one WOT test run I removed the spark plug, black, pitch black. Too rich. And I am not sure about the pilot size yet since the scooter sputters at the start but that could go away once I figured the right MJ size first.

spaz12
Thanks for the stage6 choke advice. I cut the wire to it's right size and all is good now. Pretty straight forward once you open that thing. Still I didn't need to use the choke yet.

[tsimi]

Swapped the MJ today from 100 to 98 and installed a new spark plug. Didn't go for a ride yet though.
My guess is it will be rich again. With the 100 MJ the spark plug was pitch black and I think I could go down to a 95 MJ but I don't want to rush things and go step by step this time even if it means more work.
I also need to adjust the throttle cable since it is a bit too stretched, it needs more play otherwise it pulls the slide and it revs very high when kick started.

[oldgeek]

Make sure to get the throttle cable straightened out before you are trying to tune the carb, otherwise you may have to re tune again. Also keep in mind that sizes stamped on MJs can be several numbers away from what they actually are. For instance I had some 98 MJs that were bigger than the one stamped 100. Jetting made me pull my hair out until I found out what was going on.

[tsimi]

After I got the throttle cable stuff right I went for a test run with the 98 MJ.
She likes the 98 better, still black spark plug. It does not sputter as much as it did with the 100 and I have a feeling that the 95, which is next, will do a good job. And if not I still got a 92, 90 and 88 to test.
Anyways, I was running low on fuel and I went to the gasoline stand but to my disappointment it was closed, in fact all stands were closed today.  Bummer. So I thought it would be good to get home slow by slow before I run out on fuel......aaand it happened! But not because I just simply run out but because I did not follow one of Brents simplest rules. MAKE SURE THAT ALL YOUR HOSES ARE TIGHT GOOD! My fuel hose came off and it pumped the little bit remaining fuel on the road and not into the carb.
....-> walk of shame....
If you know where I live you know that it is not possible to just push the Scooter home unless you try to compete as world strongest man. So I ran home, cut my garden hose (was not used for a while so no water in it) and siphoned 500ml fuel from my stock Jog and grabbed my smallest zip-ties and ran back to my red Jog.
Arrived there I zip-tighted the fuel hose and added the bit fuel into the empty tank.
She fired up and I could drive her home. On arrival I checked again the fuel hose and saw that the oil hose was off too. Man I can consider myself lucky today to not have seized the BBK. Tomorrow I will zip-tight the shit out of all hoses and make sure they never ever come off again.

Man what a day....my hands still smell like fuel even after 3 hand wash and one shower.

Btw. spaz12 remember the spare throttle wire? That thing wasn't worth shit. It was the stock wire for the old Jogs and that one won't give me full WOT no matter how I adjust it so I went back to the red longer one. The stock one was 150cm (which is the correct size) and the red, current one is 175cm (around 10 inches longer). No problems thus far.

[spaz12]

SAFETY WIRE IS YOUR FRIEND