problems with aftermarket exhaust - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 4 Old 04-10-2016, 03:34 PM Thread Starter
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Unhappy problems with aftermarket exhaust

i have done so many long rides , especially i use cbr to go to my village ,650 kilometres now 14000 on odo i had installed akrapovik slip on exhaust with baffle off on my cbr , all seemed fine until i was riding in the city, but when i went for a 650 km long drive i experienced some problems that i couldnt coup, after 30 kilometers my right hand went numb may be because of vibrations from acra exhaust,,though it never happened in the past with stock exhaust, after 60 kilometres the culprit 1/2 inch wide locally made gasket [packing between stock pipe and akra slipon] fell somewhere again due to vibrations,the original graphite gasket was stuck in stock pipe ,,and stock pipe was 600km away ,,no mechanics could help me out, and i am a carpenter by progression, so i managed to fix it in a giffy with a 38mm piece of m.s pipe and metal sheet packing, it was done , there was no leakage, but still i felt little lose of power , after 60km my head was in pain by the sound from exhaust,as my brother told me it will be unbearable for long rides,,it was truly unbearable later, but fortunately i had the baffle attachment with me , so installed it and it was fine to move further, i experienced little power loss without the baffle, and i saw no improvement in top speed,, i did 148.5kmph with stock exhaust , and 149kmph with akrapovic exhaust ,as i always check the coneset with both hand off while riding, but this time bike wanted to steer to left may be because of less weight on the right hand side as akra weighs less than the stock,,bike runs straight in a line with no hands on bars with heavy stock exhaust the only thing i liked about akra was the sound with baffle off, but it was unhelpfull in the event of long rides, i managed to reach in 10 hours & 30 minutes, first thing i did after reaching home,,removed akra, and installed the stock back.my younger brother told me ,i will have to remove akra one day.

riding in rain, riding insane
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post #2 of 4 Old 04-10-2016, 09:03 PM
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Yes, I had a similar experience regarding the loudness of the aftermarket exhaust. At first it seems fine but then it becomes very intrusive, especially on long rides. After a month, I was thinking about methods to improve the baffle. Then the rubber clamp on the exhaust melted and made a mess. I gave up on the aftermarket system and went back to the stock exhaust system.

The system manufactuer gave me a full refund, so I will not post pictures of the melted clamps. I don't think the system was designed to be used for long rides and it overheated. It's really intended for offroad use.

I decided to keep the aftermarket stainless steel header pipe, because the factory header pipe was rusty.

I don't think your feeling of numbness in the hands was result of the exhaust system. That happens to my hand sometimes, usually because I forgot to support my weight with my body. Also if your clothes bunch up under your armpit, it blocks circulation.

Not sure what to say about the steering...it was probably the road surface. It's very hard to steering a motorcycle by shifting only weight on one side.
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post #3 of 4 Old 04-10-2016, 10:49 PM
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Ear plugs? I find the wind noise over 60km/h unbearable. Wind noise + a loud can is a surefire way to lose your hearing prematurely. $70 for some custom molded earplugs is a tiny investment that will save your hearing and associated medical costs down the track.
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post #4 of 4 Old 04-11-2016, 12:27 AM
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akra is one of the better quality slip ons
[used by honda on 'concept' bikes and moto3 etc]
reduced weight of slip on will not cause imbalance..
if anything the reverse [i also did tests for this effect
with leo vince evo II carbon s/o, knee steering etc]..

your position and knee steering will vary
according to c of g, road camber and
input from mind, ie, expectations etc..

aside from using db reducers or other
additional sound suppressors, which can have
only a limited if real effect [on systems stated to be
for closed course racing use] the obvious and
well know solution is ear plugs, plus other
direct sound suppression at helmet level
such as good fit, tight seals, scarves etc..

sore hands from long distance runs
may be effected by significant vibration
but can and do happen to novice riders
and others with poor hand condition
[many today] especially when gripping
the bars.. holding the same position,
for any joints, must result in muscle
tiredness in joint support muscles etc..

for long rides esp on good surfaces
consciously rest plus flex fingers etc,
do regular hand changes, taking one hand
off, changing back etc positions, stretching
fingers etc, perhaps resting forearm on tank..
otherwise try to find a balanced distribution
of weight thru main control joints, shoulders,
elbows, wrists, hand/fingers..

unless time is a serious priority, stop and rest,,
stretch out, have a drink, take a leak, look around
[ie, gentle neck stretching] close your eyes
[small muscles move eyes, thus get tired
from constant use staring ahead]
and generally relax.. smile..

continue on relaxed and refreshed..

if wheels are not aligned perfectly
[or close to] ongoing disruptions to
power flows thru drivetrain to wheels
can result in extra vibration effects..
good wheel/sprocket alignment
with free running chain will
result in smooth running..

tire pressures also effect feel
and potential stability..
over inflated/too hard will amplify
any irregularities in road surfaces etc..

some use higher pressures for less
rolling resistance thus better mileage,
and for extra loadings, gear etc..
for comfort a touch less pressure
may be helpful..
according to manufacturers
recommendations etc..
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