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Old 04-02-2009, 05:16 PM   #1
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i have the first gen mag head motor. the crank seems to be alot shorter than other motors i have had. i have a crank extender but it is way too long.
it measures over 4mm. does anyone know who makes a shorter crank extender? 2-3 mm. if i shim everything out to make the one i have work i will run into the tank. i am working with a losi 2.0. i have the king headz quick change mount, with it moved to the rear setting. i think that i read where the aluminum haead motor went back to the standard length crank.
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Old 04-02-2009, 05:19 PM   #2
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Old 04-02-2009, 05:23 PM   #3
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http://www.amainhobbies.com/product_...oducts_id/5428

http://www.amainhobbies.com/product_...oducts_id/2940

Hope that helps.
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Old 04-02-2009, 05:43 PM   #4
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The ones in the ofna shim kit are 4mm and 7mm, just measured mine.
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Old 04-02-2009, 05:51 PM   #5
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Originally Posted by patrick lsp View Post
i have the first gen mag head motor. the crank seems to be alot shorter than other motors i have had. i have a crank extender but it is way too long.
it measures over 4mm. does anyone know who makes a shorter crank extender? 2-3 mm. if i shim everything out to make the one i have work i will run into the tank. i am working with a losi 2.0. i have the king headz quick change mount, with it moved to the rear setting. i think that i read where the aluminum haead motor went back to the standard length crank.
Just wondering, what flywheel are you using and are you running spacers behind the flywheel? Could it be that you are running too many washers/spacers between the flywheel and the front bearing? It sounds unusual that though your crank is too short, that it is coming close to hitting the tank on your vehicle.
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Old 04-02-2009, 06:47 PM   #6
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stock losi flywheel. it only comes close to the tank if i shim it out enough to make the crank extender that i have work. the one i have measures 4.85 mm from end to end. i guess i can dremmel off a couple mm's. if i don't shim anything the crank extender is a good 2-3 mm too long. i tried using the stock losi nut that has a little extender and also a ofner version that has a little more extender built in, but the distance i need is right in between everything that i have.
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Old 04-02-2009, 06:52 PM   #7
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Quote:
Originally Posted by patrick lsp View Post
stock losi flywheel. it only comes close to the tank if i shim it out enough to make the crank extender that i have work. the one i have measures 4.85 mm from end to end. i guess i can dremmel off a couple mm's. if i don't shim anything the crank extender is a good 2-3 mm too long. i tried using the stock losi nut that has a little extender and also a ofner version that has a little more extender built in, but the distance i need is right in between everything that i have.
Sounds like you are just going to have to shave the one you have down a little bit. I do remember hearing about the short crankshaft for some reason. Not sure why OS would do that
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Old 04-03-2009, 02:03 AM   #8
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Quote:
Originally Posted by patrick lsp View Post
i have the first gen mag head motor. the crank seems to be alot shorter than other motors i have had. i have a crank extender but it is way too long.
it measures over 4mm. does anyone know who makes a shorter crank extender? 2-3 mm. if i shim everything out to make the one i have work i will run into the tank. i am working with a losi 2.0. i have the king headz quick change mount, with it moved to the rear setting. i think that i read where the aluminum haead motor went back to the standard length crank.
You best option is the use a flat file to remove some of the material off the back of the flywheel taper cone. This will move the flyhweel back enough to get the CB bolt, shims and washer on. It will still align correctly with the center spur. We did this on my friends AL Speed in his Losi 2.0. Other option is using a bolt with an extended shoulder, but I don't know anyone in the US that carries these specially bolts. It made by H.S. Takagi and is used for the Losi, MBX6 and MP9. They come in 1mm & 2mm offsets.
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Old 04-03-2009, 02:11 AM   #9
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Sounds like you are just going to have to shave the one you have down a little bit. I do remember hearing about the short crankshaft for some reason. Not sure why OS would do that
Prior to newer buggies with longer clutchbells or flywheels, O.S. made the Speed cranks shorter so you didn't have to stack shims behind the flywheel to get the CB to shim up properly. The length of the average SG crank was not needed. But now, a lot of buggies use longer CB/clutch flywheels based off the average SG crank lengths, like the Losi or MBX6, so now the Speed crank ends up too short and you need to use extender ends or special bolts to get them setup correctly. I know the VSpec crank is longer and the JX21 crank I believe is longer also than a Speed crank.
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Old 04-03-2009, 08:55 AM   #10
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Originally Posted by ezveedub View Post
Prior to newer buggies with longer clutchbells or flywheels, O.S. made the Speed cranks shorter so you didn't have to stack shims behind the flywheel to get the CB to shim up properly. The length of the average SG crank was not needed. But now, a lot of buggies use longer CB/clutch flywheels based off the average SG crank lengths, like the Losi or MBX6, so now the Speed crank ends up too short and you need to use extender ends or special bolts to get them setup correctly. I know the VSpec crank is longer and the JX21 crank I believe is longer also than a Speed crank.
I believe all of the cranks are standard length now. I think they made that change when the AL head speed came out.
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Old 04-03-2009, 09:31 AM   #11
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I believe all of the cranks are standard length now. I think they made that change when the AL head speed came out.
Maybe now, but I have to check. The AL Speeds had mid running changes. Also, the Spec II has a different part I believe also, so the change may have been there.
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