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Sorry man...Calling BS ON THIS Way too many people running heavily built motors with excellent reliability results to make a statement like that. The least common denominator in this equation here is you or whomever built the motor. I have a decent sized back yard track and a private group that has at least six of us riding 143 equipped bikes, one with a 160 and mine with a stroked 155 and NONE of us have had issues with our motors. If you had issues with a BBK installed on a 110 it was caused by user error. No denying it. One of our riders even budgeted himself to run a no name manufactured 143 kit and its running just fine and hes going on season #3 with it.
 
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i had two different places do it and it happened both times
Is the issue you are having with the big bore kit itself or the output shaft? These are two different things/conversations....
 
yea mine smoked and metal shavings were in my oil then after a while the out put shaft snapped and it was lots of money to fix
its not alot of $$ to fix unless you have to have someone do the work for you... its not that hard to split the cases and replace
 
well now that he states it doesnt shift in second obviously you found your problem.... Ive seen metal shavings from clutches, rebuilds, trannys, etc....
agreed, :) every person on here is a mechanic remember LOL
 
Sorry man...Calling BS ON THIS Way too many people running heavily built motors with excellent reliability results to make a statement like that. The least common denominator in this equation here is you or whomever built the motor. I have a decent sized back yard track and a private group that has at least six of us riding 143 equipped bikes, one with a 160 and mine with a stroked 155 and NONE of us have had issues with our motors. If you had issues with a BBK installed on a 110 it was caused by user error. No denying it. One of our riders even budgeted himself to run a no name manufactured 143 kit and its running just fine and hes going on season #3 with it.
. Man i dont see why ur getting all butthurt and defending 110 big bores like ur in a relationship with them lol. I was just telling him what happened to mine and what the shops told me... They said the big bore kit made something happen causing the output shaft to wear down or sometghing i dont remember full detail it was a year ago
 
. Man i dont see why ur getting all butthurt and defending 110 big bores like ur in a relationship with them lol. I was just telling him what happened to mine and what the shops told me... They said the big bore kit made something happen causing the output shaft to wear down or sometghing i dont remember full detail it was a year ago
Wow - And you believed the shop that told you this? Hey - I got some land in Florida I will sell you cheap... The reason I am getting butthurt over your comment is because when a person such as the original poster asks a question here looking for honest input to find/fix his problem and some non mechanical ability having ass clown like you chimes in and makes an absolutely false statement it does not help the person trying to get their bike fixed in any way and it hurts the credibility of those posting here who have a clue as to what they KNOW...Not what some shop told them.
 
Between 2006 and 2008 (got out of pit bikes after that) I replaced at least 6 second gears on completely stock motors. Hard riding destroys the gears, not just big bores.

Output shafts broke as a result of kick starting big bore/high compression motors with no comp. release devices. Plenty of people bump started their big bore bikes with stock shafts and never had any issues. It the design of the engine transmission that breaks the shafts during kick starting.
 
yeah in just gonna split the case and rebuild it, what case spliter should I get??
If you watch Alexthekid on YouTube. He shows you how to split the cases with out a case splitter.

I tired his method on one of my junk china motors. Worked just fine

Sent from my iPhone using Planet Minis
 
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