Hi , so following on from earlier topic i got round to fitting the new double sided gearbox aduster . As an extra hole needs drilling to mount the square anchor block it was off with primary drive case, hole drilled on left side of cradle exactly matching the one on the right . Primary case put back and sprocket n clutch replaced , then i realised my mistake - its impossible to get any sort of spanner on the adjuster nuts on left side so thease are not much more than finger tight - makes them a bit pointless !
To anyone else fitting one of thease , it would be better to fit the square anchor block forward of the main bolt slot where you can get a spanner to the nuts .
Next was setting primary chain tension , my solution was with top n bottom gearbox bolts slackend i put a block and wedge between chain and swinging arm to keep it tight and pulling box back , then setting primary chain tension . Others may do it differently ?? Anyway i have now done 20 miles and nothing has moved so a success .
Conclusion - the double sided adjuster was a pain to fit and probably not necessary if i had set gearbox up correctly , my haynes manual mentions pulling gearbox backwards but doesnt say how or why so hope this post helps somebody
"How and why". As force in…
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Reduced hex nuts
I use reduced hex nuts (7/16" spanner size) on the gearbox adjuster.
Same size as the alternator stator fixing nuts.
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Next time the primary drive…
Next time the primary drive casing is off i will get some some bar about 1/2" long , drill and thread it and drill holes around outside to accept a tommy bar
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"How and why". As force in rear chain is greater than the force in primary chain, especially on lower gears, the gearbox will be drawn back. It also wants the gearbox to turn slightly to the left causing a misalignment. So you always have to adjust pushing the box forward and finally tighten the front adjuster nuts. Usually only loosen the upper bolt is enough for adjusting. I've heard that on a belt drive the engine and gearbox axles has to be parallel to minimize side wear on the belt. A chain drive can tolerate some misalignment. Reason for twin adjusters with belt drives. I've seen racers who replace the adjusters with metal strips with two holes. Having a set of those with different centre to centre distances to get adjustment right. Saves some weight.
Hopefully you can understand my bad English.