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Restricting a previously tuned bike

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grant965
Brolly Dolly



Joined: 02 Mar 2011
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PostPosted: 21:10 - 04 Mar 2012    Post subject: Restricting a previously tuned bike Reply with quote
Hi, looking around for a new (to me) bike and Ive seen a tidy bandit, only problem is that it has been dynojetted and tuned to suit and Im on a restricted license.
Surely the same standard restrictors wouldn't work?
Any ideas, other bandits in this good condition don't come up that cheap within a reasonable distance very often so looking for another wouldn't be my first choice.
thanks, Grant
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temeluchus
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PostPosted: 21:19 - 04 Mar 2012    Post subject: Reply with quote
They should be ok-the restictors fit between the carbs and the engine stopping the engine from breathing properly-in effect, no matter how far you open the throttles on the carbs, the restrictors keep the engine throttled.

I assume we are talking a bandit 600 running a dynojet kit and maybe an aftermarket can. that would only add at most a few horsepower, mostly at the top end.
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lihp
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Joined: 22 Sep 2010
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PostPosted: 21:19 - 04 Mar 2012    Post subject: Reply with quote
Get it back to standard first, then restrict, simples Wink

I personally don't like buying modified bikes where original parts are unavailable, are they? If so, it should be just a few hours of work to get it back to standard.
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grant965
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Joined: 02 Mar 2011
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PostPosted: 21:21 - 04 Mar 2012    Post subject: Reply with quote
it says this:
'the bike has been dynajetted on a rolling road and had the engine professionally tuned (all paperwork included)'
not entirely sure what that includes though
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lihp
World Chat Champion



Joined: 22 Sep 2010
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PostPosted: 21:23 - 04 Mar 2012    Post subject: Reply with quote
Temeluchus wrote:
They should be ok-the restictors fit between the carbs and the engine stopping the engine from breathing properly-in effect, no matter how far you open the throttles on the carbs, the restrictors keep the engine throttled.

I assume we are talking a bandit 600 running a dynojet kit and maybe an aftermarket can. that would only add at most a few horsepower, mostly at the top end.


I would imagine that restricting with a dynojet kit fitted will make a mess of fuelling.
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grant965
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Joined: 02 Mar 2011
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PostPosted: 21:24 - 04 Mar 2012    Post subject: Reply with quote
Am i right in thinking a dynojet is added/used in the carbs? Could I simply change the carbs to some standard ones?
thanks
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hornetmike
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PostPosted: 21:24 - 04 Mar 2012    Post subject: Reply with quote
Buy a different Bandit there is loads of them
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grant965
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Joined: 02 Mar 2011
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PostPosted: 21:27 - 04 Mar 2012    Post subject: Reply with quote
hornetmike wrote:
Buy a different Bandit there is loads of them

not like this one, body and paint looks spot on. Isn't in the usual dull/faded red, unusually there is nothing I would change on it.
Priced just below other bandits, looks like its owned by a guy who knows his stuff.
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hornetmike
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PostPosted: 21:34 - 04 Mar 2012    Post subject: Reply with quote
Its going to take effort put it back to standard and will run rubbish if you don't do it right, restrictors make most bikes run rough without extra fuel from dyno jets
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 21:35 - 04 Mar 2012    Post subject: Reply with quote
Hi

Don't think it will make a major problem with the fueling. Should behave just like not opening the throttle that much.

However depends on what they have done to tune it. It could still produce a bit more power than a standard restricted bike. Could also land up producing a bit less than a standard bike. Depends on what has been done to shuffle around the power (ie, different design of exhaust, not just the can, different cams, etc).

All the best

Keith
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Redoko
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Joined: 04 Nov 2009
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PostPosted: 21:35 - 04 Mar 2012    Post subject: Reply with quote
grant965 wrote:
hornetmike wrote:
Buy a different Bandit there is loads of them

not like this one, body and paint looks spot on. Isn't in the usual dull/faded red, unusually there is nothing I would change on it.
Priced just below other bandits, looks like its owned by a guy who knows his stuff.


And ragged it to boot.

Don't rush. There are plenty of other bikes.
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temeluchus
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PostPosted: 21:42 - 04 Mar 2012    Post subject: Reply with quote
PhilDawson8270 wrote:


I would imagine that restricting with a dynojet kit fitted will make a mess of fuelling.


Why? Can you explain this?

Restrictor plates effectively mean the throttle is never fully opened. Will not have any effect on fuelling.
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lihp
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Joined: 22 Sep 2010
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PostPosted: 21:52 - 04 Mar 2012    Post subject: Reply with quote
removed as inaccurate, don't want to mislead.

Last edited by lihp on 08:43 - 05 Mar 2012; edited 1 time in total
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 22:21 - 04 Mar 2012    Post subject: Reply with quote
PhilDawson8270 wrote:

Restrictors that restrict air flow, such as the washers that go under the carbs, can cause fuelling issues for numerous reasons, some bikes have issues, some don't.


Shouldn't really. The washers after the carbs limit the air flow, in the same way that the throttle does. It is this air flow that moves the slide in the CV carb that controls the fueling.

All the best

Keith
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lukamon
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Joined: 18 May 2007
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PostPosted: 23:07 - 04 Mar 2012    Post subject: Reply with quote
grant965 wrote:
Am i right in thinking a dynojet is added/used in the carbs? Could I simply change the carbs to some standard ones?
thanks


hi there id like some dynojetting put in my carbs please

certainly sir, ill just finish putting the headlight fluid in this obe and ill be right with you
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Frost
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Joined: 26 May 2004
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PostPosted: 23:34 - 04 Mar 2012    Post subject: Reply with quote
The bike is like a fit runner, normal bandits are like normal people. Restricting is like making them breathe through a straw. Both are going to be massively down on performance Laughing
The dyno kit might add a few bhp to a full power bike, but once restricted it will probably be exactly the same as a normal one.
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janner_10
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PostPosted: 23:37 - 04 Mar 2012    Post subject: Reply with quote
I can't find any headlight fluid on ebay, it must be rare.
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lukamon
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Joined: 18 May 2007
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PostPosted: 23:52 - 04 Mar 2012    Post subject: Reply with quote
grant965 wrote:
Am i right in thinking a dynojet is added/used in the carbs? Could I simply change the carbs to some standard ones?
thanks


hi there id like some dynojetting put in my carbs please

certainly sir, ill just finish putting the headlight fluid in this obe and ill be right with you
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temeluchus
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Joined: 01 Oct 2008
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PostPosted: 00:05 - 05 Mar 2012    Post subject: Reply with quote
PhilDawson8270 wrote:
I suppose it would depend on the method of restriction. Throttle restrictors, then yes, it will be just like using partial throttle.

Restrictors that restrict air flow, such as the washers that go under the carbs, can cause fuelling issues for numerous reasons, some bikes have issues, some don't.

However, a lot of sports bikes have issues restricted by this method and really don't run well at all restricted with Washers.

The higher state of tune that the engine is in, the more and more critical the fuelling becomes for smooth and correct operation, this makes restriction with washers less reliable and more likely to have running problems.

If you're going to restrict a bike, then a tuned/modified, or high performance engine isn't the ideal place to start from.

If there is a restrictor on the throttle, or slides then it's a better way of doing it, and in my opinion gives a more guaranteed operation post restriction.


You show ignorance of how CV carburettors operate. There is NO functional difference between a throttle stop, slide stop or restriction washers. The rider opens the secondary throttle which allows the engine to place demand on the carburettor. This demand (vacuum) controls the primary throttle which holds the needle and controls the fuelling. The plates place a maximum on the demand-they will not alter the fuelling as a CV carb works on demand, regardless of the operators ham fist.

Dont get confused with straight "slide" (non CV) carbs.

I doubt the bandit has had any real performance tuning. Adding a aftermarket can and a dynoject kit is only tuning in the sense of making the engine run correctly with the new pipe.
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lihp
World Chat Champion



Joined: 22 Sep 2010
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PostPosted: 08:41 - 05 Mar 2012    Post subject: Reply with quote
Admitedly Carbs are not my area, I'm from a fuel injection era, and only worked with carbs on bikes, plus I've never used restrictors, I'll edit my above post so I don't mis lead anybody.

Thanks Thumbs Up
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Wafer_Thin_Ham
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Joined: 18 Nov 2005
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PostPosted: 09:03 - 05 Mar 2012    Post subject: Reply with quote
grant965 wrote:
it says this:
'the bike has been dynajetted on a rolling road and had the engine professionally tuned (all paperwork included)'
not entirely sure what that includes though


Ask the man what it included. I'd be dubious of any engine tuning actually having occured. Firstly because it's on ebay, and secondly because he can't spell "dynojet" correctly.

Ask for a photo of the paperwork and details of the actual tuning. Thumbs Up



(My money's on an oil change and some iridium spark plugs)
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Rogerborg
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PostPosted: 09:32 - 05 Mar 2012    Post subject: Reply with quote
Go for it. It shouldn't nob up the fulling, and how many people bother to check that their 'restricted' bike is really making <=25kW (at the crank!) anyway?
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