670 track swap?

thumperracing

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I have a 98 summit 670 with a 136" track currently which i believe to be 1 3/4inch lugs and i bought a 144" track and rails with 2inch lugs and i have been told by some people that it will not fit, that it will hit the tunnel where it goes around the drive shaft and other people have said i have to buy new drivers/sprockets for the driveshaft that are smaller and then it will work. Just wondering if anyone has any ideas or experience with this. Thanks!
 

99summitx

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Welcome to the site, you came to the right place. You need to go to 8tooth extrovert drivers to get the lug clearance, new bearing and a seal while your at it. No gearing changes need with a 144 and 8 tooth swap.
 

0neoldfart

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Or better yet: use 9 tooth extroverts, and drop and roll your chaincase for the track clearance. You neglected to state if your Summit was an X pkg or not - the reg Summit 670 came with 8 tooth drivers and a 2" track, the X had 9 tooth drivers with an 1.75" track.
 

thumperracing

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Yes sorry it is a 670X model. How do you drop and roll the chaincase?
 

mxz sledhead

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I just change out mine org. was .95 i went to a 1.75 change the drivers to
7tooth the 9 tooth was 8.125 dia 7 tooth is 6.125 anti racketing modified
the plastic end caps on the slide rails i good clearance all round i hope this helps
 
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