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Post by tsimi on May 20, 2015 20:52:10 GMT -5
nelsonThat scooter is currently my daily driver to get to work or go anywhere I need to. Next week I should get my second Jog up and running and then THAT one will be my new daily driver and the current one will be the BBK scooter. I cannot keep a tank full of gasoline at home that will not cope good with my house president(wife) so I will have to mix on the way. I would like to also keep the oil pump so I thought I just add a bit oil to the tank. The thing is no one really knows home much oil gets pumped in by the pump therefore it is kinda hard to calculate how much I should add additional to the tank. Especially at the beginning when the BBK is still new I don't want to break it so I thought more is better then too few. I can sure carry around a small bottle of 2T oil that is no problem. According to my calculation; (full tank 5.7l) 80:1 => 71ml 50:1 => 114ml 32:1 => 171ml I could go with 80:1 just to be safe and not over do it. BTW. congrats on your new scoot! Yamaha all the way! 
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Post by nelson on May 20, 2015 22:36:59 GMT -5
Thanks, and the only thing it would hurt with too much oil is the plug since most is being injected and not going through the main jet. I would think at the least it would inject 40:1. You could put an oz or 2 in the reservoir and see how many tanks of gas it take to run the oil out but u better be careful!
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Post by 2stroked on May 22, 2015 8:52:40 GMT -5
Yeah, I have to agree with nelson, on this. Okay, you have to understand that using the pump and adding extra will be just a tiny piece if mind, right. The only way to know for sure your getting oil, is to ditch the pump and go premix. I suggest you learn the sound of your engine very well, before you try to count on the added oil to help any. I use the pump, and add the little extra cuz I know ( knew, its been a whip since its ran ) the way my engine sounded when happy, and when being starved for oil. I also pay attention to the smell, and the smoke, or lack thereof. The oil in my tank won't make my bike smoke a lot,but when I add an ounce or so to a tank, it does make a beautiful plume of sweet smelling smoke. I know that if it stops smoking, for more that a split second, that something is bad wrong, and shut her down. I have also learned to tell if I am running excessively hot, by the smell of the engine, or the sound at times. More often the smell. Everybody is different, and so is every bike. So take the time you need, to learn yours. The small amount of oil I add, iznt quite enough to foul the plug much faster than normal.
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Post by tsimi on May 31, 2015 9:37:42 GMT -5
Finally I had a bit time today and so I installed the BBK.
Good news everything seems to be back in place.
Bad news the engine won't start.
My Jog has no on/off valve for the fuel so i need to kick it to fill the bowl so it is possible that i didn't reach that point yet or when i assembled the BBK some oil might have gotten to the spark plug and therefore prevent it from firing?
It got dark outside and i was too exhausted from the kicking to continue.
Will look again tomorrow.
I just hope that the piston rings are OK. Can you feel by the movement of the piston if the rings are broken?
Took also pictures so stay tuned...
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Post by tsimi on May 31, 2015 19:48:52 GMT -5
UPDATE:I could barely sleep yesterday...going through the install process over and over again. Asking myself, did I do something wrong? Did I forget to connect something? Did I send the piston rings to their nirvana? Did I insert the needle and it's collar correctly inside the carb? In the morning before going to work I took my tools and opened the top part of the carb, checked it and it was all OK there. Then removed the spark plug, there was no oil residue it was dry and still looking new. So I kicked the starter a few times without the spark plug inside it. Then put back the spark plug and kicked it once more and....... WROOOOOM! It fired! And what a relief that was after all the anxiety. I didn't had time to let it warm up or even drive it yet since I was running a bit late for work. Will check again this evening but it seems like all is going well. Here some pics; 1. My "garage", hilarious compare to what you guys have. 2. Preparation, securing the scooter. (you see 90GTVert this is what I meant with small roof.) 3. Needed to empty the oil tank to remove the hose. 4. Main bolt removed! and scooter is holding. 5. Old 50cc 6. Engine block without cylinder. The crank looked really good and way better then I thought it would. 7. Piston and cylinder installed. Just a little bit more.... 8. Cylinder head installed and tighten down with 14Nm torque.  
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Post by niz76 on May 31, 2015 23:39:22 GMT -5
Yay tsimi! Sounds like it just needed a few more kicks to get the fuel through the system eh? We want vids of your first wheelies!
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Post by birdman on Jun 1, 2015 0:36:36 GMT -5
Nice!! Goodjob tsimi!!! Hearing it run after the install feels great doesn't it! |
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Post by tsimi on Jun 1, 2015 0:56:40 GMT -5
Nice!! Goodjob tsimi!!! Hearing it run after the install feels great doesn't it! Yes sir it does indeed! Is this something you get used to it or is it something that always stays, that feeling I mean? |
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Post by tsimi on Jun 1, 2015 0:58:53 GMT -5
Yay tsimi! Sounds like it just needed a few more kicks to get the fuel through the system eh? We want vids of your first wheelies! Yeah it seems that way. Or the scooter needed a good night sleep, lol. I'll do that after the break in. I still have no clue how much power gain I got or will it die on me after the first few meters? Need to cut the rear fender too or I will drop ugly. |
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Post by Lucass2T on Jun 1, 2015 10:49:44 GMT -5
Is that a 5BM engine i see there in pic 6? |
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Post by tsimi on Jun 1, 2015 17:34:21 GMT -5
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Post by tsimi on Jun 1, 2015 19:06:58 GMT -5
Another short update; Yesterday after work I took the Scooter for a "very short" drive (approx. 2-3x 100meters). I think I did something wrong because the spark plug didn't change/show any color. No matter if MJ #86 or MJ #88. Maybe I didn't warm up the engine enough before going for a drive? How fast does a spark plug take color? With the MJ #86 I had no bogging, engine didn't sound strange at all, good response up to 6000rpm. Didn't go higher then 6000 for the first run. Then after looking at the spark plug I thought oh shit it hasn't changed at all. So Brent recommended in his tutorial to go 2 numbers higher and that would be a #88. After adding the 88 the scooter started to bog a bit when going up hill. (In front of my house are only hills no matter if I go left or right.  ) But I felt safe because I thought better having a bogging Scooter at first then a damaged BBK. But after pulling the spark plug this morning I was buffed. It looks same as when I drove it with the #86. (See picture below) That is why I think I didn't do it right. So next time I'll go for a longer drive with the #88 in place and see how that behaves and then eventually go lower back to the #86 since the scooter felt better with it.  |
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Post by niz76 on Jun 1, 2015 23:22:44 GMT -5
I think it takes a while for a plug to show color. I'm horrible bro- after a BBK install I go half throttle for exactly 4 minutes then I say "F-it that's enough break in" if the rings didn't snag and snap by now they're not going to! and go balls to the wall lol. You can't really read the plug for main jetting until you go WOT anyway!
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Post by tsimi on Jun 1, 2015 23:47:05 GMT -5
I think it takes a while for a plug to show color. I'm horrible bro- after a BBK install I go half throttle for exactly 4 minutes then I say "F-it that's enough break in" if the rings didn't snag and snap by now they're not going to! and go balls to the wall lol. You can't really read the plug for main jetting until you go WOT anyway!  I have read somewhere "the" exact same expression. "Balls to the wall" The rings didn't snag so far which is good. I am more worried about the friction and overheating thing. But you are probably right I should go out on the street and WOT the shit out of it.  Maybe then finally the spark plug will show some color. |
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Post by 90GTVert on Jun 2, 2015 8:45:58 GMT -5
I generally just read plugs for WOT. A few bursts of accel and letting it decel from 1/2 and 3/4 throttle on a new build and then a few at WOT. Then it's on. WOT passes and if I read the plug I'm looking at the mixture ring, not the porcelain up top. The rest of the plug can be helpful, but for quick WOT passes you need to be looking deep down in the plug. It's usually easiest for me to do WOT passes with trial and error and use the plug reads if I'm not quite sure which jet is best or just to verify that the one I chose is alright. 49ccscoot.proboards.com/thread/1727/spark-plug-reading-tuning-info |
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