Quick questions about the CX500 motor in my morgan replica!
Discussion
I know that i aint a proper biker, but i do have a bike engine so please dont kick me out!
Iv just bought a JZR Trike, i know peanuts about bike engines so could do with a little advice! its a replica of the old morgan racers. powerd by a CX500 engine, drive shaft straight through to the stock rear wheel and suspension unit. its got stock exhausts fitted to custom extension pipes from the engine down each side.
Im trying to get some sports exhausts for it but have been advised to simpley drill a few holes through the back plate of each exhaust can!!! Apparently this should do the trick. what im after is some more snap crackle and pop on the overrun, not just a loud drone all the time. each can already has a (seemingly standard, def not rusted through) very small hole on the underside right by the joint to the extension pipes, iv also been told that by drilling these out slightly it will let more air in the system which will and some crackle. (Already looked for baffles to remove but cant spot any) are these bright ideas?!!! or willi just cock up the backpressure and flow dynamics? iv done a quick search for sports cans designed for the CX500 but they all seem to be 2 into 1ns.
Also, im haveing intermittent trouble selecting first gear. Neutral and the rest are spot on but sometimes ijust cant select it! as iclick back from neutral to select first it just finds neutral again! this is intermittent and seems to happen whilst the engine iss very hot.
hope that you can help! Thanks, mitch
Iv just bought a JZR Trike, i know peanuts about bike engines so could do with a little advice! its a replica of the old morgan racers. powerd by a CX500 engine, drive shaft straight through to the stock rear wheel and suspension unit. its got stock exhausts fitted to custom extension pipes from the engine down each side.
Im trying to get some sports exhausts for it but have been advised to simpley drill a few holes through the back plate of each exhaust can!!! Apparently this should do the trick. what im after is some more snap crackle and pop on the overrun, not just a loud drone all the time. each can already has a (seemingly standard, def not rusted through) very small hole on the underside right by the joint to the extension pipes, iv also been told that by drilling these out slightly it will let more air in the system which will and some crackle. (Already looked for baffles to remove but cant spot any) are these bright ideas?!!! or willi just cock up the backpressure and flow dynamics? iv done a quick search for sports cans designed for the CX500 but they all seem to be 2 into 1ns.
Also, im haveing intermittent trouble selecting first gear. Neutral and the rest are spot on but sometimes ijust cant select it! as iclick back from neutral to select first it just finds neutral again! this is intermittent and seems to happen whilst the engine iss very hot.
hope that you can help! Thanks, mitch
Sorry I can't offer specific advice on the CX500, but as you say, drilling random holes in the exhaust, will not offer any more performance.
Have you tried Motad Exhausts 01432 850055 I could be wrong but I'm sure they did exhausts for the CX 500, or try ringing Harris Performance 01992532501, they may be able to point you in the right direction.
Have you tried Motad Exhausts 01432 850055 I could be wrong but I'm sure they did exhausts for the CX 500, or try ringing Harris Performance 01992532501, they may be able to point you in the right direction.
Crackling and popping is a product of overfuelling, not extra air into the exhaust system. I used to get it running Art cans on the CBR600F, as it messes with backpressure, so maybe sticky different cans on will help, otherwise its a case of making it richer until it pops, but not too much.
You're not wrong about the two into one thing, so you might want to consider picking up a couple of cheapie cans from fleabay, and running your own manifold to can tubing, especially as its going to be quite different on a car anyway.
You're not wrong about the two into one thing, so you might want to consider picking up a couple of cheapie cans from fleabay, and running your own manifold to can tubing, especially as its going to be quite different on a car anyway.
From my days of CX500 ownership I don’t remember there being any performance cans on sale. There were some cheap pattern ones that looked and sounded like the original Honda offerings and I think there were some Dunstall offerings which were more cone shaped and a bit more ‘throaty’. Other than that it was the 2 into 1 options.
Smashin, thanks for the help. iv has a peep on ebay and found these:
http://cgi.ebay.co.uk/NORTON-TRIUMPH-BSA-DUNSTALL-...
they should just slip on to the exhaust pipe extensions i think, a custom hanger from my local garage may be needed though i think! along with some fuel tweeking to get the required crackle!
as above im not that botherd about a performance increse, but i dont want to lose any power. these should effect it too much should they? just noise?
http://cgi.ebay.co.uk/NORTON-TRIUMPH-BSA-DUNSTALL-...
they should just slip on to the exhaust pipe extensions i think, a custom hanger from my local garage may be needed though i think! along with some fuel tweeking to get the required crackle!
as above im not that botherd about a performance increse, but i dont want to lose any power. these should effect it too much should they? just noise?
mitchipoo06 said:
as above im not that botherd about a performance increse, but i dont want to lose any power. these should effect it too much should they? just noise?
It shouldn't lose any power only gain, just keep an eye on the fueling - as running less restrictive silencers, tends to make the engine run lean - check the spark plugs after a few dozen miles, and if they're white it's running lean, a dynojet kit will fix this.The small hole in the muffler is to let rain water out, most stock bike systems have them.
Generally speaking, a well set up "road" engine won't pop or crackle much at all, the noises are usually indicative of something slightly out of adjustment. Competition motors, with wild cams and rich fueling tend to make more of these noises when off the cam. As an aside, you can also get "pops" on over-run with an over lean mixture, the lean mix burns too slowly and is still burning when the exhaust valve opens, (which is not great for the engine.)
The 1sr gear thing could be the linkage slightly out of adjustment.
Generally speaking, a well set up "road" engine won't pop or crackle much at all, the noises are usually indicative of something slightly out of adjustment. Competition motors, with wild cams and rich fueling tend to make more of these noises when off the cam. As an aside, you can also get "pops" on over-run with an over lean mixture, the lean mix burns too slowly and is still burning when the exhaust valve opens, (which is not great for the engine.)
The 1sr gear thing could be the linkage slightly out of adjustment.
those cans will be horrendously loud ,you have been warned! old 80's bikes are difficult to get set up
if you mess with the pipes and extra performance will be hard to get out of a cx500 you would be better off leaving well alone or get a cx650 lump .if you must,have a word with http://www.predatorexhausts.com/
if you mess with the pipes and extra performance will be hard to get out of a cx500 you would be better off leaving well alone or get a cx650 lump .if you must,have a word with http://www.predatorexhausts.com/
MTBR said:
The small hole in the muffler is to let rain water out, most stock bike systems have them.
Generally speaking, a well set up "road" engine won't pop or crackle much at all, the noises are usually indicative of something slightly out of adjustment. Competition motors, with wild cams and rich fueling tend to make more of these noises when off the cam. As an aside, you can also get "pops" on over-run with an over lean mixture, the lean mix burns too slowly and is still burning when the exhaust valve opens, (which is not great for the engine.)
The 1sr gear thing could be the linkage slightly out of adjustment.
...or the clutch dragging a bit.Generally speaking, a well set up "road" engine won't pop or crackle much at all, the noises are usually indicative of something slightly out of adjustment. Competition motors, with wild cams and rich fueling tend to make more of these noises when off the cam. As an aside, you can also get "pops" on over-run with an over lean mixture, the lean mix burns too slowly and is still burning when the exhaust valve opens, (which is not great for the engine.)
The 1sr gear thing could be the linkage slightly out of adjustment.
Great, thanks for all the tips guys. im on with getting most things sorted now, should get a pic or two of the final exhaust once set up. its currently running with no airbox at the moment, im looking to make one out of sheet alloy to place in the footwell with two silicon hoses dropping straight into the top of it and a ram pipe out of the front. ill also be fitting a baffle plate to make the air less turbulant. What im not sure about is how big the panel filter needs to be? any suggestions???
mitchipoo06 said:
Great, thanks for all the tips guys. im on with getting most things sorted now, should get a pic or two of the final exhaust once set up. its currently running with no airbox at the moment, im looking to make one out of sheet alloy to place in the footwell with two silicon hoses dropping straight into the top of it and a ram pipe out of the front. ill also be fitting a baffle plate to make the air less turbulant. What im not sure about is how big the panel filter needs to be? any suggestions???
Be careful, as force feeding air to a carburettor can disrupt the fueling procedure by messing up the air velocity through the venturi. It is designed to 'suck' air at a given rate, thus producing pressure differential and sucking fuel in through the jets. Feed it more air than it wants and things may wierd. To be honest, you'd maybe do better getting an establisehd K&N filter conversion for it, complete with new needles/jets or whatever to correct the mixture. If they make them?
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