Question about performance exaust
ssterry
05-04-2005, 11:09 AM
When I bought my 1992 Yamaha Seca II it had a Yoshimura Exhaust installed. Iv been having problems off and on with carburetion and a friend told me when a performance pipe is installed the carburators need to be rejeted. Dose anyone know anymore information about this or if it is true. Also how would i find out if the previous owners have rejeted the carbs??? Any insights or suggestions on rejeting this bike??
aussieidiot
05-05-2005, 01:37 AM
usually you can change the pipe and not worry about the jets in the carby. it just won't be unleashing any more power on its own.
people change the pipe, get the jets done and get a K+N style filter so the package as a whole performs well to increase the HP.
each one on its own or in pairs doesn't tend to do to much.
our resident moderator has a seca so when she pops back in she will be best to help with your bike it particular
people change the pipe, get the jets done and get a K+N style filter so the package as a whole performs well to increase the HP.
each one on its own or in pairs doesn't tend to do to much.
our resident moderator has a seca so when she pops back in she will be best to help with your bike it particular
NaKeDZX
05-05-2005, 03:05 PM
Generally, you can get away with a slip on without rejetting. But a full pipe more often than not requires jetting work. Buy a jet kit, follow the baseline instructions, and you'll be surprised how much better it runs. Less vibes, cooler temps, etc....
You can sometimes tell if there is a jet kit installed by pulling the top off the carb and removing the needle. Aftermarket needles have adjustment slots in them. Majority of factory needles do not.
You can sometimes tell if there is a jet kit installed by pulling the top off the carb and removing the needle. Aftermarket needles have adjustment slots in them. Majority of factory needles do not.
Z_Fanatic
05-06-2005, 08:05 PM
There's also a downside to this, if you have an aftermarket full exhaust, and there's a jet kit inside, but never adjusted properly, following nuisances will occure:
- takes 10-15 mins to warm up the bike (at least longer if there wasn't a jet kit)
- higher fuel consumption
- the bike will stall below 2000 rpm
- carbs will easily take in dirt or what not
- carbs will get easily flooded if tipped over, and recovery process might take long time
- sprak plugs might get wet from fuel and reduce sparks
- and the exhaust will release black smoke in higher revs when accelerating hard
- overall, you'll have rich mixture, there's more fuel than air.
Those were the symptoms of my previous bike, one of the carbs was dirty, but the jets were poorly adjusted for all of them. Initially, I only had one cylinder because of wet plugs. Never understood why the plugs would get wet so easily.
- takes 10-15 mins to warm up the bike (at least longer if there wasn't a jet kit)
- higher fuel consumption
- the bike will stall below 2000 rpm
- carbs will easily take in dirt or what not
- carbs will get easily flooded if tipped over, and recovery process might take long time
- sprak plugs might get wet from fuel and reduce sparks
- and the exhaust will release black smoke in higher revs when accelerating hard
- overall, you'll have rich mixture, there's more fuel than air.
Those were the symptoms of my previous bike, one of the carbs was dirty, but the jets were poorly adjusted for all of them. Initially, I only had one cylinder because of wet plugs. Never understood why the plugs would get wet so easily.
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