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General Category >> Rubber Side Down! >> Can the head of a LS650 fit the crank case of a LS
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Message started by paulmarshall on 05/05/12 at 16:32:53

Title: Can the head of a LS650 fit the crank case of a LS
Post by paulmarshall on 05/05/12 at 16:32:53

Hi I have brought a LS650 motor to replace the LS400. How ever the 400 has a 5 speed trans and the 650 has a 4. Can I put the head of the 650 onto the 400 bottom end if I replace the con rod and piston from 400 to 650? My understanding is both motors are the same except the bore and stroke.

Title: Re: Can the head of a LS650 fit the crank case of
Post by justin_o_guy2 on 05/05/12 at 16:42:03

I think stroke is a function of how far the journal is from centerline on the crank, not rod length.

YOure gonna have a 4 speed 650..

Title: Re: Can the head of a LS650 fit the crank case of
Post by verslagen1 on 05/05/12 at 17:17:16

what's wrong with a 4 speed?

Title: Re: Can the head of a LS650 fit the crank case of
Post by paulmarshall on 05/05/12 at 17:26:54

Thank you for your help, A 4 speed it is. Does anyone know of any other trouble I might encounter fitting the 650 into a 400 frame. Will the front sprocket of my 400 fit onto the 650?

Title: Re: Can the head of a LS650 fit the crank case of
Post by justin_o_guy2 on 05/05/12 at 17:29:45

Did the 650 not come with one? IDK if theyll swap, but I wouldnt be at all surprised if they did. Suzuki seems to have really tried to keep the number of inventory items down to a minimum

Title: Re: Can the head of a LS650 fit the crank case of
Post by paulmarshall on 05/05/12 at 18:01:09

The 650 is belt driven and I want to use the chain drive from my 400. Is it easy to convert the front from belt to chain sprocket?

Title: Re: Can the head of a LS650 fit the crank case of
Post by verslagen1 on 05/05/12 at 18:15:16

see chain drive conversion in the tech section.

Title: Re: Can the head of a LS650 fit the crank case of
Post by paulmarshall on 05/05/12 at 19:58:56

Thank you

Title: Re: Can the head of a LS650 fit the crank case of
Post by wambr on 05/05/12 at 21:11:26

paulmarshall Hi! no difficulties in principle to replace the cylinder with the piston and con rod from engine ls 400 to ls 650. all details are identical. We (in Russia) has been doing. easier of course replace engine assy. ...

Title: Re: Can the head of a LS650 fit the crank case of
Post by paulmarshall on 05/05/12 at 22:56:32

thanks. I think I will swap complete motors and convert to front sprocket to match the existing rear sprocket.