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Courtesy of PJ1,Why would I need to rebuild my motorcycle carburetor: Hesitation on accelerationHard starting while coldThe bike sat for a long time without runningLack of power or poor fuel economyCarburetors need to rebuilt under 2 circumstances. First, if the bike sat for a long time with fuel in the carb the fuel can turn to varnish and clog small orifices or make things stick keeping your bike from running right. This can cause hesitation on acceleration or hard starts when it’s cold. T …

These Tips were originally posted on the Cope Racing website, which no longer exist. They were authored by engine guru Greg Cope. Greg is the current crew chief on Geno Scali's NHRA pro stock Suzuki. Many people missed these tips when Greg shut the site down, so the fact that I do not know him at all I thought it was OK to rip off his page and repost it for everyone to enjoy. The page will stay up until we receive the "cease and desist" letter from Greg's attorneys. Most of this stuff applies …

THE FIRST FEATURE on ‘How to Build a Café Racer’ struck a chord. Not everybody who read it agreed with the content, but when it comes to style, there are several different schools of taste.I’m going to focus on the performance side of building a cafe racer. Or street tracker, scrambler, or any custom motorcycle, for that matter. Let’s start by picking the right bike up front to avoid expensive mistakes down the track.View Full Size1. Choose your weapon. The most affordable motorcycles to customi …

For all your tuning needs. Check out Mikuni's handy tuning manual. Tuning Manual.We have been tuning and jetting carbs for over 30 years, and sometimes you still have to read the fine print. Mikuni Carburetors from SpeedMotoCo

User paulages breaks down the similarities between the CB550 DOCH4 and the CB650 DOCH4. A 650 crank can be mated to the cb550 bottom end with minimal machining. To do a big bore on a 650 bottom end you will need cb750 cylinder liners, cb750 pistons, rings, custom head gasket, and standard gasket plus o-rings. The cylinders and top case will both have to be bored out to fit the oversized liners. The new liners will have to be machined to the same height and taper at the bottom a …