help with new BBk ---- please!

micco · 06-19-2017, 12:26 PM

update time....the egr system was T piped to the vacuum to the intake. So i blocked off the egr side.
Upgraded the rollers to 8g.

So the scoot is peppier now...BUT smokes like i'm fogging for mosquitoes.
I hope my rings aren't shot, b/c it really looks like oil is blowing by. Smoking under load and idle.... :(

Thoughts?

sc00ter · 06-19-2017, 10:48 PM

To rich would be my guess. Do a plug chop (Moped Army has a great how-to) and see what color it is. Compression test would be next. Find out what ballpark your compression is supposed to be. You can "borrow/rent" a compression tester from a better auto parts store. They love to leak during testing so make sure all connections are snug. Soapy water is your friend. The original compression reading would have been you data point, but to late for that. Its out there somewhere on the Web. You checked the valve clearance and made sure the timing was correct so Im not thinking that. If it was sudden (the fog affect) you could have a bad float or the choke got stuck, but not really thinking choke. If it was sudden you may have jumped a tooth? Does the bbk use the same spark plug heat range as original cylinder? Same reach spark plug? Check if the spark plug gap is correct also. Thats all I can think of for now off the top of my head.

micco · 06-20-2017, 09:43 AM

great points, again.

I switched back to the original cylinder head last night, still smokes - but i did get rid of that rattle sound. Might have been the emissions tube vibrating against the valve cover...

I reused the same plug, NGK and its black with some deposits on in.

Since its smokes right off the start, that wouldn't be the main jet i swapped, correct?

I'm really thinking its the rings, as its smoking much much more then it did at first, and the smoke has a white/blueish tint.
I didn't file the rings down during install; i read somewhere you need to...maybe my bad?

There's a tomos nitro 150cc for sale, which i might just buy, rather then spending time on this project :(

sc00ter · 06-20-2017, 11:53 AM

We have never filed rings before but know others who have. If I were to bet on what I think it is-float in carb bowl. Did you remove the bowl on the carb? If so, I bet you may have accidentally knocked the float out of adjustment. Common mistake and kinda easy to check the float height. Check the compression. That will tell you if the cylinder is at proper compression and tell you if there is a ring issue or if its something else non-compression related. Now, about the Nitro 150. You going to tag and insure it or swap the motor into your current 50cc? I have a 200cc Burgman for my main ride and play around with the 50cc for a hobby. If you tag and insure the Nitro then you can take your time and figure out the bbk kit. Learning is power, so dont give up on the bbk until you at least figure it out first. Anyways, do a compression test first and if that looks about right (info is out there, forgot what the Zuma bbk kit was) then check the float height.

06-19-2017, 10:48 PM	#2
sc00ter Join Date: May 2017 Location: Norfolk, VA Posts: 530	To rich would be my guess. Do a plug chop (Moped Army has a great how-to) and see what color it is. Compression test would be next. Find out what ballpark your compression is supposed to be. You can "borrow/rent" a compression tester from a better auto parts store. They love to leak during testing so make sure all connections are snug. Soapy water is your friend. The original compression reading would have been you data point, but to late for that. Its out there somewhere on the Web. You checked the valve clearance and made sure the timing was correct so Im not thinking that. If it was sudden (the fog affect) you could have a bad float or the choke got stuck, but not really thinking choke. If it was sudden you may have jumped a tooth? Does the bbk use the same spark plug heat range as original cylinder? Same reach spark plug? Check if the spark plug gap is correct also. Thats all I can think of for now off the top of my head.
	0

06-20-2017, 11:53 AM	#4
sc00ter Join Date: May 2017 Location: Norfolk, VA Posts: 530	We have never filed rings before but know others who have. If I were to bet on what I think it is-float in carb bowl. Did you remove the bowl on the carb? If so, I bet you may have accidentally knocked the float out of adjustment. Common mistake and kinda easy to check the float height. Check the compression. That will tell you if the cylinder is at proper compression and tell you if there is a ring issue or if its something else non-compression related. Now, about the Nitro 150. You going to tag and insure it or swap the motor into your current 50cc? I have a 200cc Burgman for my main ride and play around with the 50cc for a hobby. If you tag and insure the Nitro then you can take your time and figure out the bbk kit. Learning is power, so dont give up on the bbk until you at least figure it out first. Anyways, do a compression test first and if that looks about right (info is out there, forgot what the Zuma bbk kit was) then check the float height.
	0