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Electric Start For Vincent
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<blockquote data-quote="greg brillus" data-source="post: 177256" data-attributes="member: 597"><p>The starter kits work very well.......but on a super tuned up twin, or a big bore high comp engine, the starter will struggle........it is a big compromise and cranking the engine from the opposite end of the gearbox mainshaft is less than ideal.......I see no harm in using the decomp to assist in the start.......it is really more if the engine has not run for some time and the lower crank case is full of oil......this extra drag puts extra strain on the starter just like it slows the crank when you kick start with your leg. The issue with a Norvin is there is very little space on the handlebars (clip ons) for a valve lifter lever.......Some of the ones i've done had the late model TPV heads on with the ability to fit a 12 volt solenoid type Harley decomp valve in each head.......this was a simple matter of a horn type push button on the bars.......Another good mod that I am doing to my own Norvin twin build is to machine a second plug hole on each head and install a pair of the Royal Enfield (India made ones) decomp valves.....these are a very simple cable operated poppet valve that can be hooked up together via one of the one into 2 cable spliters like originally used for the throttle on a twin.......They are quite cheap to buy and readily available.......with the 2 hooked up to a small lifter lever on the bars, it takes up very little room and is very easy to operate, much less effort than the original valve lifter set up.......one finger job.......I did this exact same mod for a new build Vindian project I have just finished for a customer in Victoria.......this is a kick start only bike but the decomp set up is the same as described......works very well and takes up no room on the bars. I first used these valves on a special build twin I did for Ian Boyd in Western Australia years ago.......this was primarily a post war "B" twin but the engine was a pre war bottom end and post war top end.......with this engine there was no decompressor mechanism in the engine at all.......so the use of these type valves was the only solution. I was amazed at how good the set up worked, it made starting the engine an absolute breeze, and this was using the pre-war Burman gearbox with the normal short kickstart lever........all good fun.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 177256, member: 597"] The starter kits work very well.......but on a super tuned up twin, or a big bore high comp engine, the starter will struggle........it is a big compromise and cranking the engine from the opposite end of the gearbox mainshaft is less than ideal.......I see no harm in using the decomp to assist in the start.......it is really more if the engine has not run for some time and the lower crank case is full of oil......this extra drag puts extra strain on the starter just like it slows the crank when you kick start with your leg. The issue with a Norvin is there is very little space on the handlebars (clip ons) for a valve lifter lever.......Some of the ones i've done had the late model TPV heads on with the ability to fit a 12 volt solenoid type Harley decomp valve in each head.......this was a simple matter of a horn type push button on the bars.......Another good mod that I am doing to my own Norvin twin build is to machine a second plug hole on each head and install a pair of the Royal Enfield (India made ones) decomp valves.....these are a very simple cable operated poppet valve that can be hooked up together via one of the one into 2 cable spliters like originally used for the throttle on a twin.......They are quite cheap to buy and readily available.......with the 2 hooked up to a small lifter lever on the bars, it takes up very little room and is very easy to operate, much less effort than the original valve lifter set up.......one finger job.......I did this exact same mod for a new build Vindian project I have just finished for a customer in Victoria.......this is a kick start only bike but the decomp set up is the same as described......works very well and takes up no room on the bars. I first used these valves on a special build twin I did for Ian Boyd in Western Australia years ago.......this was primarily a post war "B" twin but the engine was a pre war bottom end and post war top end.......with this engine there was no decompressor mechanism in the engine at all.......so the use of these type valves was the only solution. I was amazed at how good the set up worked, it made starting the engine an absolute breeze, and this was using the pre-war Burman gearbox with the normal short kickstart lever........all good fun. [/QUOTE]
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Electric Start For Vincent
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