(12,50 €) £12.50 exc vat
(15,00 €) £15.00 inc vat
In stock
The finished sizes of the bushes are -
For road use;
Front bush 1.628" +0.002", rear bush 1.503" +0.002".
For race use;
Front bush 1.631" +0.002", rear bush 1.504" +0.001".
NOTE: these figures are based on the crankshaft surfaces where the primary gear runs being 'as new' in sizing. If the crankshaft is well used and shows signs of wear in these areas - carefully measure the journal diameters with a micrometer (or some such suitably accurate device). To the figures gained allow a running tolerance of 0.003" - 0.005" for road use on both bushes, and 0.006" - 0.008" on the front bush, 0.004" - 0.005" on the rear bush for race use.
Running clearance for this gear-front bush running clearance finished size 1.503" +0.002"-0-0"
For race use 1 thou more clearance with plus 1 thou tolerance but never undersize.
Front bush 1.628" +0.002" -0.0" never undersize as it requires clearance.
For race allow an extra thou 1.504" +0.001" only.
if cranks are worn measure crank and allow 3-5 thou running clearance and race use 5-7 thou on front bush and 4-5 thou on rear bush.
(12,50 €) £12.50 exc vat
(15,00 €) £15.00 inc vat
In stockRecommended usage 1 x DAM8889 to fit one mini.
This is the top hat bush for all primary gears and is now silicon based to help lubrication of this dry running bush. Used in all our primary gears.
For Cooper S or pre A plus 1275 type primary gears we also have a a replacement front bush i...
This is our racers favourite way of dealing with the worn or troublesome front primary gear bush.(this is NOT the top hat type rear bush)22.5mm wide. Racers and professional engine builders will use their own tolerances but these are set for road use...
Evolution Straight cut 22 tooth 1275 primary gear.
Achievable drop gear ratios when using our Evolution gears:
22 tooth primary - 30 tooth idler - 25 tooth input = 1.136-1
24 tooth p...
Evolution Straight cut 24 tooth 1275 primary gear.
Achievable drop gear ratios when using our Evolution gears:
22 tooth primary - 30 tooth idler - 25 tooth input = 1.136-1
24 tooth primary - 30 tooth idler - 24 to...
Evolution Straight cut 23 tooth 1275 primary gear.
Achievable drop gear ratios when using our Evolution gears:
22 tooth primary - 30 tooth idler - 25 tooth input = 1.136-1
24 tooth p...
IKO idler gear bearing with special rollers for allowing movement on late type idler gears. The idler gears for twin point cars were also made from clean steel as an upgrade from 1996 on. This special bearing replaces the cheaper inferior earlier bea...
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Some original fi...
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clearance needs to be 0.03mm
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This is the top hat bush for all primary gears and is now silicon based to help lubrication of this dry running bush. Used in all our primary gears.
For Cooper S or pre A plus 1275 type primary gears we also have a a replacement front bush i...
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This is our racers favourite way of dealing with the worn or troublesome front primary gear bush.(this is NOT the top hat type rear bush)22.5mm wide. Racers and professional engine builders will use their own tolerances but these are set for road use...
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