Weight Saving

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knackeredMk1
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Bike Owned: Modified Mk1
Weight Saving

Post by knackeredMk1 » 10 Oct 2011, 18:32

What I did:

Stock dry weight of CRM250 Mk1 123kg. Knackered's project weighed 112kg with all oils and 1/2 tank of petrol. The weight reduction has come through -

Approx weights as I remember them, though I did not weigh many parts.

Tank - original v CR125 = -1.5kg
Got rid of lots of useless brackets holding on stuff e.g. rear brake fluid reservoir, whole section from back of sub frame for lights, helmet lock ........ (saved a lot of weight)
Got rid of whole rear brake light switch and replaced with HEL pressure switch.
Replaced whole rear brake master cylinder, pipe and reservoir with one from a CRF.
Replaced steel brake pedal with ally one from CR500. = ~-300g
Replaced front brake master cylinder and also calipers front & rear with CRF.
Replaced steel kickstart with ally one from CR250 = ~-300g
Replaced whole exhaust system FMF/DEP = - 2.5-3.0kg
Got rid of carb heater.
Got rid of coolant overflow tank and piping.
Got rid of some wiring in the loom and relays = -250g (weighed)
Got rid of sound proofing in air box side panel = -200g (weighed)
Got rid of all original rear lights = a lot
Got rid of indicators + brackets
Replaced speedo and removed surrounding metal work.
Got rid of speedo drive and cable.
Got rid of chain guard on swing arm.
Got rid of whole oil level sensor system.
Ally rear sprocket.
Got rid of rear foot pegs (put in plastic bolts to save threads) = -450g (weighed)
Replaced carb = -135g
Replaced air filter frame = ~-100g
Stainless steel brake hoses are much lighter than original.
Got rid of side stand switch, cover etc.
Replaced steel bars with ally.
No tool box and tools.
CR seat is lighter than the CRM one.
I suspect lighter tyres.

Rear shock is 500g heavier than original. There is also the sump guard and hand guards to put in here.

The biggest areas to reduce weight are the exhaust system, the tank and getting rid of the very bulky rear lights and supporting framework. You could loose quite a bit by making an aluminium subframe.

Titanium bolts are not really worth doing as they are not suitable for stressed areas and are very expensive.


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