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Interchanging crankshafts???

Posted: Fri Dec 07, 2012 11:16 pm
by 20QL
Can a crankshaft from GP engine fit in a Jet or any other series 3 engine casing without any modification and vice versa? I am attempting to build a Li125 engine and have a spare GP crank so I do not want to fork out if I don't have too!
cheers
Luke

Re: Interchanging crankshafts???

Posted: Fri Dec 07, 2012 11:22 pm
by carlos fandango
20QL wrote:Can a crankshaft from GP engine fit in a Jet or any other series 3 engine casing without any modification and vice versa? I am attempting to build a Li125 engine and have a spare GP crank so I do not want to fork out if I don't have too!
cheers
Luke
Yes you can as long as its a std. gp crank (ie 58mm stroke and 107mm con rod) it will be fine in a li 125 engine. You will need a different bearing in the mag housing NU2205 and a GP flywheel for a gp crank.

Re: Interchanging crankshafts???

Posted: Fri Dec 07, 2012 11:25 pm
by bristolmod
will fit but you will need to have the correct flywheel for the crank. Flywheel side bearing is specific as well (GP vs LI).

The other anomaly is when a TV175 is brought into the equation as their cranks had longer rods fitted

Chris

Re: Interchanging crankshafts???

Posted: Fri Dec 07, 2012 11:40 pm
by rosscla
^ to summarise the answer to your question is no, not without other expensive modifications

Re: Interchanging crankshafts???

Posted: Fri Dec 07, 2012 11:44 pm
by RICSPEED
rosscla wrote:^ to summarise the answer to your question is no, not without other expensive modifications
true but its the gp type fly wheel that is the only issue and tbh a gp crank is a worth while modification anyway especially if kitting the scoot at a later date

Re: Interchanging crankshafts???

Posted: Fri Dec 07, 2012 11:52 pm
by 20QL
Thanx for feedback Lads!
Ha Ha! Anomalies, facts and opinions are always accepted!!