FirebladeST
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| posted on 26/5/09 at 05:41 PM |
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Jetted or not jetted???
How would i know if my fireblade engine has been jetted? Can somebody fully explain what it actually entails? I seem to have noticed some flat spots
and wonder if its been done? or needs mapping???
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mistergrumpy
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| posted on 26/5/09 at 05:47 PM |
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To re jet the engine means that the carbs have been played with. Basically you change the main fuel jet to a fitting with a larger or smaller diameter
bore and the needle is changed for an adjustable needle (basically it has ridges in with an E clip and washers on) They both alter power at a certain
range.
You can't really tell unless you take the carbs apart which isn't an especially hard job.
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snapper
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| posted on 26/5/09 at 06:20 PM |
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Jetting is only half of the job.
A good rolling road will set up jets, needles, progresion holes and float levels.
Its a black art to me but people like Boggs brothers seem to have a good reputation.
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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andrew.carwithen
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| posted on 26/5/09 at 06:33 PM |
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What 'blade engine have you got? - is it an early carbed one or later with throttle bodies (fuel injection).
If its a carb motor, then as previous post, jetting refers to fitting larger main jets and fitting different tapered needles to richen the fuel ratio
between mid and top end.
If its fuel injected, then a Power commander is used to enable different mapping to be used to change the airfuel ratios.
Assuming you have carbs, then standard size of main jets is 115. If its been correctly dynojetted, then depending on what air filter/exhaust system
you've used, these will have been changed for something in region of 128 or 132's (you'll have to remove carbs and floatbowl to
check. The jets are marked.)
If it does seem that its been done,then your flat spots perhaps could be due to the carbs being imbalanced.
Have a look at http://www.zen69595.zen.co.uk/carb.htm
which explains how to do the dynojetting.
Should you need to fit one, then I'd strongly advise buying the dynojet kit from AB Performance. Tell him (Andy Bates)what exhaust and air
filter you're using and he'll supply the appropriate size jets.
He spent two days solid on a rolling road establishing what the optimum jet size and needle settings were for the blade, so there is no need to waste
money on a rolling road session yourself. All his RGB boys use the settings he came up with to great success and if its good enough for them then
it'll certainly be good enough for you!
I fitted one of his kits and my engine (also supplied by him) pulls cleanly all through the rev range with no flatspots whatsoever.
[Edited on 26/5/09 by andrew.carwithen]
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