Bob,
What I meant when I said no carb restrictions it was only to emphasize the ones found
in US models, such as tamperproof screws, in some cases non adjustable needles,
special brass plugs that do not allow you to change idle mixture etc. Mine has none of
that and that is why I use the "non restrictions on my carbs" as opposed to the US
models ( I hear the Californian model is even worse ).
The original needles and main jets were perfect for the original exhaust system I had,
but now with the S7K I have 175 mains, totally different needles, bigger slide holes
and springs, air jets and so on ( I only keep the standard idle screws...), my bike
would have not worked if I hadn't changed the pipes and filters. Of course if you put
more mixture in you need more room to let the combustion gas out.
By the way, did you know that the Dynojet Stage 7 Kit for the European model is
exactly the same as the one sold in the US? It makes you think that there could not be
large differences between engines otherwise it would not work properly.
About your friend and his Cobra's, if you let the gas out freely, you are bound to get
less power from your engine, since the valve timing is designed for a certain amount
of backpressure on the exhaust, otherwise you let out part of the unburnt mixture,
thus letting some of the ponies run away. Most of the mods to the exhaust system mean
a change to the carburetion including filter & all.
But I'm sure you already know that.
Best regards,
Charles ( [EMAIL PROTECTED] )
----- Original Message -----
From: Bob Huber <[EMAIL PROTECTED]>
To: V-MAX TECH LIST <[EMAIL PROTECTED]>
Sent: Sunday, March 12, 2000 12:31 AM
Subject: Re: slight backfire
> Charles
> While you state that there are no restrictions in carburation I must
> disagree.Not only in the way they limit the output through carburation but
> also in ignition
> timing and advance (the dreaded black box).As Tyler has mentioned before the
> mains are smaller,different low speed circuit and also needle taper.I have a
> friend in the U.K. that put some Cobra slipons on the bike with disastrous
> results as far as performance with a slight change in exhaust.Thanks to
> Tyler and others I sent the gent a set of stock U.S. needles,some shims and
> a different set of low speed air jets as well as slightly larger mains and
> he's a happy camper as far as I know.Yes your not limited as far as what can
> be done but it's a real pain in the as- without the resourses.Just my
> input.Again thanks for all the info provided by this list.
> Bob H
> ----- Original Message -----
> From: <[EMAIL PROTECTED]>
> To: "V-MAX TECH LIST" <[EMAIL PROTECTED]>
> Sent: Saturday, March 11, 2000 6:02 PM
> Subject: Re: slight backfire
>
>
> Tyler,
> the European Max comes without any restrictions regarding what you can do
> with the carburetion . Slide covers have no special tamper proof screw,
> needles have five slots to choose from, idle mixture screws only have a
> rubber protection to avoid rust, so I still believe that if there is a lean
> mixture problem, we in Europe would have enough resources to sort out the
> problem.
>
> In my case I have tried adjusting the screws from fully closed (clockwise)
> to four turns anti clock wise with no real effect on this sudden cough when
> opening the throttle. I must say it is very annoying and what is more, it
> can't be good for the engine.
>
> Regards,
> Charles ( [EMAIL PROTECTED] )
>
>
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