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Post by terryosw81 on May 9, 2018 9:18:08 GMT -5
Ok I installed a 100cc bbk with a 52mm head and it won't start and it blows white smoke from the exhaust please help
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Post by fugaziiv on May 9, 2018 12:16:09 GMT -5
Just a guess, but sounds like you're rings aren't set correctly so you're blowing oil up past the rings into the combustion chamber. That's the white smoke that you're seeing.
Also, there is no such thing as a 100cc kit. A 52mm kit is actually 88cc.
Matt
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Post by terryosw81 on May 9, 2018 12:32:08 GMT -5
Yes I no about the 100cc not being true,ok that's what I thought it's just I've replaced them so many times and moved them around like the specs call for but it still does it,also I had a mother question I have the 50mm jug and yesterday I sent someone to get me a new head just in case and they gave me a 52mm and the bad thing is it's not returnable so can I use it with the 50mm jug thanks
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Post by fugaziiv on May 9, 2018 12:33:20 GMT -5
Yes I no about the 100cc not being true,ok that's what I thought it's just I've replaced them so many times and moved them around like the specs call for but it still does it,also I had a mother question I have the 50mm jug and yesterday I sent someone to get me a new head just in case and they gave me a 52mm and the bad thing is it's not returnable so can I use it with the 50mm jug thanks You can use it, but you'll have lower compression and therefore make less power. Matt |
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Post by terryosw81 on May 9, 2018 12:34:51 GMT -5
Ok thanks ya I'm at 120 psi
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Post by fugaziiv on May 9, 2018 12:38:01 GMT -5
Ok thanks ya I'm at 120 psi Sounds low. Are you using a PWK or CVK carb, and if CVK did you do the compression test with the carb on the bike or off? Matt |
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Post by terryosw81 on May 9, 2018 12:42:57 GMT -5
I think it's cvk and with the carb on with the throttle open,it's on a znen but It's not stock I think 20mm can't remember
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Post by fugaziiv on May 9, 2018 12:47:43 GMT -5
I think it's cvk and with the carb on with the throttle open,it's on a znen but It's not stock I think 20mm can't remember Okay, as a CVK carb is vacuum operated, even if you hold the throttle open unless the bike is running the slide in the carb is never going to be truly open. Pop off the carb and do the compression test again. Matt |
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Post by terryosw81 on May 9, 2018 13:08:07 GMT -5
Ok did that and it's 100psi I guess I was wrong I thought it was 120,but I bought this bike new in 2015 rode it for about 1k miles then put a 50mm bbk in it with exhaust and carb and intake filter and it ran good for about 1k miles then it made funny sounds and died on me so I got a nother kit and have been trying for a year off and on to get this thing going,I've tried several ring sets,and pistons and nothing I did have it going a couple days ago but it smoked so bad
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Post by terryosw81 on May 9, 2018 13:16:49 GMT -5
And I forgot to mention that is with the 52mm head on I get 120psi with the original 50mm head
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Post by fugaziiv on May 9, 2018 13:26:07 GMT -5
Well, neither one is really enough compression to run, so you're losing compression somewhere. Unfortunately, probably time to take the top end down, clean some surfaces really good, and take a hard look at your parts.
Matt
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Post by terryosw81 on May 9, 2018 13:32:54 GMT -5
Ok thanks so much
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Post by terryosw81 on May 9, 2018 18:14:25 GMT -5
Ok took the hole motor apart and found out that I had ring 1 and 2 reversed,so I fixed it and put the 50mm head back on and I got it to start up and run but it was still shooting out a lot of white smoke and a big back fire so I'm guessing it's the rings hopefully I'm so tired of trying to get it to run
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Post by pistonguy on May 10, 2018 7:12:15 GMT -5
He can get back some of that compression loss of the 52mm head on a 50mm bore by running a thinner base and head gasket, can't tell how much without measuring volumes..
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Post by terryosw81 on May 10, 2018 12:09:29 GMT -5
Well now I'm just waiting to get some new rings and then see if that works,I'm hoping to make it to the bike shop by Tuesday it sucks living a hour away from it,or mabey I can shop online just don't know who to trust as far as quality
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