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Apache modified- what next?
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Originally posted by Joel View PostU dont need a bigger jet as such. Just make the needle richer. It will be fine. If you get a 105, put it sometime.Originally posted by Joel View PostIf you are using a smaller dia pipe, then too bad. Not recommended. It will shoot engine temperature and also restrict exhaust gas flow at high revs.Not sure about the 'messing' thing but my engine breaths a lot freely now... it has become a lot smoother and I can cruise at 100 effortlessly.. Between 4500 to 5000 rpm the engine seem to a bit unresponsive but across the rest of the power band, it revs pretty quickly. The 5 cc gain is not something too small to be disregarded as psychological. I am happy that my efforts are paying off except for one problem that there is some starting trouble.. Looking forward for next service... That time I would also conclude whether worn out clutch can really affect the speed.Originally posted by Joel View PostNow although you have messed the cylinder head, u have not not lost any mid-range, coz u are running a smaller dia pipe. A longer and smaller pipe will help kick low-mid at the cost of top-end power. This is exactly what has happend. The moment u switch to a larger dia exhaust pipe, u will loose the midrange and low end a bit over stock too.
Thnx! Imagine if the pipe is smaller than the stock, then the mouth would also be smaller -a blunder which experienced mechs would not commit. I also remember now, the boring mech removed some tiny casting burrs near the mouth of the exhuast.Originally posted by sankar View PostSo invincible, nothing to worry bout much.. the psychological horses that your engine lost due to a thinner pipe may not be not lost afterall
Even if the interior diameter (is that what ID means?) is smaller causing restrictions, the remaining part of the exhaust should relieve the pressure a lot more than stock causing a significant gain.
I think the best way to judge the performance gain of all these changes done, is to drag with a stock A150.
OK we all speak about power gains.. but anyone knows what happens to the torque? Does it change proportionately or it may be having its own effect on the graph?
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To adjust the needle you will need to open the carb, remove the slide, disconnect the acc cable and you will see a locking clip holding the needle in place in the slide. remove this. once you've got the needle out of the slide you will notice some grooves near the top of the needle and a circlip in one of them. this circlip when moved to another groove will change the needle position.
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the pop sound is indeed the reason of lean mixing.. you should be able to fine tune the BS26 by increasing the air screw to make it a spot richer.
Regarding jets, you should be able to get one at teh pro biking showroom. Its a BS26, the same default carb that comes with the tbird..
Too lean of a mixture can cause overheat and ruin the cylinder walls. Also try using Nulon or STP for the engine as this will help maintain viscosity and ensure stablity.
hope this helps..
- mustang
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