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Post by onewheeldrive on Feb 16, 2015 2:08:14 GMT -5
If you go to "normal reply", there is a "preview" option--- hit that to see if your pic shows up before posting.
It definitely looks like the rod busted through the case, that's for sure.
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Post by geh3333 on Feb 16, 2015 2:19:17 GMT -5
 Okay I think its finally working. First off may I thank each and everyone of you who have given me great input on whats going on. I have very little knowledge of finding out what went wrong. The big bore kit was ordered from Amazon for 60 bucks. I have very little knowledge on how to asses what went wrong. I followed the video on putting everything together and it ran fine for a bit. There is only 275 miles on the engine. So I don't know what went wrong. My guess is that it was running lean. Since everything else seemed fine. I adjusted the intake to .008 an the exhaust to .010. Thats pretty much all I can say for now. IS there a way to tell whats lean from rich? lean is bad right? rich is good? How many miles on the engine before the bbk ? |
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Post by stevo684 on Feb 16, 2015 3:58:52 GMT -5
Okay I think its finally working. First off may I thank each and everyone of you who have given me great input on whats going on. I have very little knowledge of finding out what went wrong. The big bore kit was ordered from Amazon for 60 bucks. I have very little knowledge on how to asses what went wrong. I followed the video on putting everything together and it ran fine for a bit. There is only 275 miles on the engine. So I don't know what went wrong. My guess is that it was running lean. Since everything else seemed fine. I adjusted the intake to .008 an the exhaust to .010. Thats pretty much all I can say for now. IS there a way to tell whats lean from rich? lean is bad right? rich is good? How many miles on the engine before the bbk ? THere was about 150 miles on it. When I changed the BBK. |
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Post by ramblinman on Feb 16, 2015 8:36:32 GMT -5
My guess is that it was running lean. Since everything else seemed fine. I adjusted the intake to .008 an the exhaust to .010. Thats pretty much all I can say for now. IS there a way to tell whats lean from rich? lean is bad right? rich is good? alley's thread on tuning 4 strokes: itistheride.boards.net/thread/12/4ts-carb-tuninga lot of the carbs on these new scoots will be sealed so you'll either have to drill them out or install a new unsealed carb. i think most use  -  main jet with a 50mm bbk. someone correct me if i'm wrong. |
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Post by jerseyboy on Feb 16, 2015 9:14:56 GMT -5
Looks like the rod broke and came through the back of the case...just a guess man thats horrible,,I haven't seen that yet on these motors....could also be something else but pretty sure its the rod or crank.
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Post by tvnacman on Feb 16, 2015 9:46:01 GMT -5
Its new engine time looks like there is damage to two of the 3 parts that make up the engine . it looks like crank failure .
John
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Post by alleyoop on Feb 16, 2015 12:23:05 GMT -5
Yes the crank broke through the casing on that one. New motor time unfortunately, but they are cheap enough it will cost you more if you try to rebuild that motor. If you every have taken one apart you will notice there is not much clearance between the crank and the case. So when either of the bearings fail and creates some slop in the crank it will hit the case from the inside and bust it open.
Alleyoop
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Post by stevo684 on Feb 16, 2015 18:18:33 GMT -5
Yes the crank broke through the casing on that one. New motor time unfortunately, but they are cheap enough it will cost you more if you try to rebuild that motor. If you every have taken one apart you will notice there is not much clearance between the crank and the case. So when either of the bearings fail and creates some slop in the crank it will hit the case from the inside and bust it open. Alleyoop First off thank you so much to everyone. onewheeldrive, geh3333, stevo684, ramblinman, jerseyboy, tvnacman, alleyoop . It makes sense as when I installed the bbk it would start up right away. And then some time after the customer said it was hard to start. And took a long time. And when he called me over. It would not start at all and the battery was wearing down. And went I tried to kick start it it fired up a bit and I felt a big jolt in the kick start. I have already changed it out with a spare engine I have in stock and now its back to 50cc. So should I add in the bbk again? He did pay me for labor and parts for the bbk. Just scared I may break another engine as now I only have 2 more in stock. Please help. THanks. |
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Post by rcq92130 on Feb 16, 2015 18:22:38 GMT -5
Might want to check oil level. Even with that big hole, I'd expect most of the oil to be there. If the engine is dry, or almost dry, that would likely be the reason the inners exploded.
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Post by rcq92130 on Feb 16, 2015 18:22:50 GMT -5
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Post by tvnacman on Feb 16, 2015 18:32:15 GMT -5
i'm with RCQ on the oil .
John
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Post by stevo684 on Feb 16, 2015 22:06:37 GMT -5
One thing that I do know. When I installed the bbk. I added oil in there. and made sure it was topped off before starting the engine. And then when I started it I had the front head off exposing the valves and then it was pumping and oil eventually made it through. Should I have checked the oil again. after the engine had cooled?Im just thinking that maybe because there was no oil in the big bore kit chamber maybe the level went lower? Does that make sense or does that even happen. Appreciate the input. Thanks.
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Post by alleyoop on Feb 16, 2015 22:13:20 GMT -5
Let me ask , did you up jet the carb, I think it was running really lean and got nice and hot. Don't forget when you turn a hot motor over to someone they open it up and bend over the handlebars and see how fast can I go..LOL Some will take them down a hill to see how fast they can get it to go but at the same time the rpms climb out of site. So if you put in a 83 or so make sure you at least up jet the carb to a or so at least it has a chance of living a few days. Alleyoop |
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Post by geh3333 on Feb 16, 2015 23:24:36 GMT -5
Let me ask , did you up jet the carb, I think it was running really lean and got nice and hot. Don't forget when you turn a hot motor over to someone they open it up and bend over the handlebars and see how fast can I go..LOL Some will take them down a hill to see how fast they can get it to go but at the same time the rpms climb out of site. So if you put in a 83 or so make sure you at least up jet the carb to a or so at least it has a chance of living a few days. Alleyoop That's why I like my scoot to never be able to climb over 8000 rpms even down huge hills . maybe 8100 lol |
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Post by alleyoop on Feb 16, 2015 23:33:52 GMT -5
Good for you..LOL
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main jet with a 50mm bbk. someone correct me if i'm wrong. 
..BAD TO THE BONE..
