Question about 1998 Cagiva Mito 125 Evoluzione

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Exhaust problem I Have had some good help on here so far so i fought i would just ask about the exhaust

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I looked on the rs 125 posts and alot of them said to de-cat the exhaust is best? is this correct? also how is it done on a bike thanksMitos dont have cats liek cars maybe they ment de-coke? (black stuff in the zorst from unburt fuel and oil) hope your going for the jolly moto exhaust.,,

Posted on Nov 10, 2008

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I bought a 2005 XL 883 its been customized by the previous owner, it has a two into one exhaust, screamin eagle air cleaner, its always had a cough, it had a 200 mianjet, 42 low, what jets should it h


Hi Anonymous, the stock 883 came with a 160 main jet and a 42 slow speed jet. As far as the juggs go see if you can find casting numbers on the cylinder base. Does your bike have the power of a 1200 or an 883? As far as the coughing goes look for any telltale signs of oil like stains around the intake manifold to the heads or gun powder like residue at the exhaust ports, a sure sign of leakage.

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Fueling issue running far to lean, choke makes the circuit richer so it will run , lean running causes over heating and serious engine damage if its running red hot, check the plug for white burnt or blistering will show lean running. Compression test to make sure the piston ring and barrel are not damaged over 110psi. Is the exhaust blocked restricted or dented ?

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Hi im just wondering about mounting toss over style saddlebags on my 1986 harley heritage softail. how far above the exhaust do they have to sit


They don't have to be real high, just clearing the exhaust is usually sufficient as the pipes really aren't that hot at the end. I'd have them at least an inch above the pipe though.

Good Luck
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I have an 860 GT and want to know the ideal compression pressure


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Valves "Unadjustable" 2004 Dl-650


If the valves were bent, the engine wouldn't run worth a darn, if at all. What I suspect is that the exhaust valves have sank their way into their seats and are now positioned too far upward in the cylinder head to attain adequate tappet clearance. Exhaust valves have more of a tendency to do this because of their high thermal loading during operation. Then, as the engine continues to be operated - and the tappet clearance diminishes, the valves run even hotter, causing damage to the valve and seat ares.
So, to answer your question; yes, the previous owner did neglect it - by failing to keep the valve tappet clearances set correctly.
The only cure for this, sadly, would be to remove the head and replace the exhaust valves and recondition the cylinder head's valve seats. Of course it may turn out that the cylinder head valve seats are worn beyond repair, requiring a new cylinder head.

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1 Answer

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hi,fairly common problem with modified exhaust,start with the pilot screws,turn right in untill the screws are firm then back out 1 and 3/4 turns,this is a fairly standard rule of thumb that will get most things going,as far as the jets go,the original size would be a good starting point,but you should only need to go up 10-15 sizes to compensate for the exhaust mods(ie stock might be 127 may need to go to138 or 140 etc),the other thing that i would recommend is getting hold of a set of damped carb balancers these will enable you to get the mixtures and carb balance dead right,they are relitively cheap and easy to use and will have paid for themselves the first time you use them.(i regularly get 4-8 sometimes 10-11 extra hp over stock by tuning the carbs up properly).hope this helps

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5 Answers

2005 RM 85 fouling plugs every ride.


obviously theres way to much oil in the mix. Speak to your local bike shop and ask them on the best mix for the bike

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