Question about 2003 CCM 604 DS Dual Sport

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Improvement the performance

I have a totally standard well looked after engine. Are there any basic mods to do just to unlease a bit more potenial?

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Drill several 1 holes in the airbox185 main jet in the carb and as u sayfree flowing exhaust..........(big bore kitport and flow head),,,

Posted on Nov 10, 2008

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Posted on Jan 02, 2017

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Is it ok to put high performance spark plug on my tao tao 50cc scooter

Hi, Anonymous sure why not just make sure it is the same heat range as OEM for more information about your question and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
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Mar 11, 2016 | Motorcycles

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I have a 2004 CR125R that i baught in 2006 brand new it has less than 20 hours on it. ever since i've got it, it hasn't liked anything other than high rpm/powerband...if im just riding along at...

Reason is pretty common as these 2 stokes and all 2 strokes they really only designed for one thing - Wide open throttle ! Race track performance. short bursts of flat out to clear all fuel and oil enough to idle through tight corner then straight into wide open throttle again.
Some alternatives for you to try would be lean out the fuel air screw just tiny amount 1 / 8th off a turn in. See if bit leaner setting helps your low RPM a bit also you could consider less oil in the fuel mix 32:1 is pretty high on oil. Most would run these at around 40:1 at the track you don't need to make big changes just adjust to 36:1 first just to check the results - you will soon know if is improvement or not ?
Only change one thing at a time then test ride or you will never know the right direction if the change helps then great but if no change or worse, put it back to original setting and try something else until you find the right direction If the bike is at its best flat out then there cannot be to much wrong thats actually perfect really! so just some very fine tuning should get you where you want to be - Good luck! regards Jamie

May 27, 2011 | 2004 Honda CR 125 R

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My pulsar 150CC silencer is partially rusted. It has a hole & so the noise level increased. If I dont change the silencer now, will the engine get affected ?

Some say that "an engine needs backpressure to work correctly." Is this true?
No. It would be more correct to say, "a perfectly stock engine that cannot adjust its fuel delivery needs backpressure to work correctly." This idea is a myth. As with all myths, however, there is a hint of fact with this one. Particularly, some people equate backpressure with torque, and others fear that too little backpressure will lead to valve burning.
The first reason why people say "backpressure is good" is because they believe that increased backpressure by itself will increase torque, particularly with a stock exhaust manifold. Granted, some stock manifolds act somewhat like performance headers at low RPM, but these manifolds will exhibit poor performance at higher RPM. This, however does not automatically lead to the conclusion that backpressure produces more torque. The increase in torque is not due to backpressure, but to the effects of changes in fuel/air mixture, which will be described in more detail below.
The other reason why people say "backpressure is good" is because they hear that cars (or motorcycles) that have had performance exhaust work done to them would then go on to burn exhaust valves. Now, it is true that such valve burning has occurred as a result of the exhaust mods, but it isn't due merely to a lack of backpressure.
The internal combustion engine is a complex, dynamic collection of different systems working together to convert the stored power in gasoline into mechanical energy to push a car down the road. Anytime one of these systems are modified, that mod will also indirectly affect the other systems, as well.
Now, valve burning occurs as a result of a very lean-burning engine. In order to achieve a theoretical optimal combustion, an engine needs 14.7 parts of oxygen by mass to 1 part of gasoline (again, by mass). This is referred to as a stochiometric (chemically correct) mixture, and is commonly referred to as a 14.7:1 mix. If an engine burns with less oxygen present (13:1, 12:1, etc...), it is said to run rich. Conversely, if the engine runs with more oxygen present (16:1, 17:1, etc...), it is said to run lean. Today's engines are designed to run at 14.7:1 for normally cruising, with rich mixtures on acceleration or warm-up, and lean mixtures while decelerating.
Getting back to the discussion, the reason that exhaust valves burn is because the engine is burning lean. Normal engines will tolerate lean burning for a little bit, but not for sustained periods of time. The reason why the engine is burning lean to begin with is that the reduction in backpressure is causing more air to be drawn into the combustion chamber than before. Earlier cars (and motorcycles) with carburetion often could not adjust because of the way that backpressure caused air to flow backwards through the carburetor after the air already got loaded down with fuel, and caused the air to receive a second load of fuel. While a bad design, it was nonetheless used in a lot of vehicles. Once these vehicles received performance mods that reduced backpressure, they no longer had that double-loading effect, and then tended to burn valves because of the resulting over-lean condition. This, incidentally, also provides a basis for the "torque increase" seen if backpressure is maintained. As the fuel/air mixture becomes leaner, the resultant combustion will produce progressively less and less of the force needed to produce torque.

Sep 16, 2010 | 2005 Bajaj Pulsar 150

2 Answers

I wish to debaffle o9 1200c

if you are on about the standard exhaust , then you will need a long cold chissel to punch out the washer welded in the baffle to direct air in to sound deadner. hammer the chissel through the washer making hole as big as you can , i did mine while exhaust were still on bike and use a 16mm blunt sds drill bit i had lying around. does create a harsh sound compared to screaming eagles.try the sportster .org site for more info.screaming eagles are the best way to go , i only punhed mine through cause i couldn't strech to carb, air filter and exhaust mod in the same month, it will also affect you efi system ,if you do not do some fueling, and air filter mods, the bike will lean out causing detonation problems and possible damage to engine.

Oct 03, 2009 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

387 cc engine best performance mods

The best bang for the buck is a race cam. Google performance motorcycle cams and then make a couple of phone calls. There may be a cam for your engine sitting on a shelf or you just send them your cam and they re-work it and send it back. The cost is around $250 plus the cost for your local bike shop to remove and then re-install the cam. Other mods do not even begin to add power the way a hot cam will.

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Sep 30, 2009 | 1978 Yamaha XS 400

1 Answer

2003 xj600 needs an engine what year engine will fit???

Many years will fit as this engine is an old one that has had minor internal mods over the years. If you want to keep the same performance you need to stay close to your model year.

Aug 25, 2009 | 2002 Yamaha XJ 600 Diversion S-N

4 Answers


backfiring means you have an air leak or a lean mixture. Look for leaks at the header pipes or perhaps a crack in the exhaust.
Cold air getting into the exhaust is usually what causes the backfire noise.
You may have a lean engine running situation but the bike would have other issues besides the backfire.
Let me know if you are having any other issues or if it just the backfire.

Jan 02, 2009 | 2005 Suzuki Boulevard C90

1 Answer


For more power you can port the engine but I would start with performance Reeds. Also would adjust suspention and revalve if needed. That would be it for me…,,

Nov 10, 2008 | 2003 HM CRE 250

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