yamafun

seems more of a corrosion problem. remove all the electricals including the stator , and rotor and brush all the connections with a steel brush

Thanks for the beautiful pictures. In San Diego, California I get to see a glimpse of Spain from you.

IT CAN BE DONE. REQUIRES TIG AN OR MIG WELDER. DIE GRINDER WITH CUTTING BLADE. NEED TO CHANGE REAR WHEEL SPROCKET TO MATCH PITCH AS USED BY DT400'S.

MY 1979 YAMAHA DT175 HAS 22 HORSEPOWER AT 12000 RPM. MAX RPM IS 13000RPM. DYNO TESTED USING A DYNOJET 2 WHEEL AUTOMOTIVE DYNO. USED ONLY ONE ROLLER INSTEAD OF BOTH. ORIGINAL HORSEPOWER WAS APPROX 14 HP AT THE WHEEL AT 7000 RPM. MODIFICATIONS ARE THE FOLLOWING: IT175 CYLINDERHEAD MODIFIED ON A LATHE; SHAVED CYLINDERHEAD BUT MADE COMBUSTION CHAMBER WIDER. OCTANE USED 91 OCTANE. USED 1977 IT175 CARBURATOR MODIFIED; BORED OUT TO REDUCE VENTURIS. REJETTED ON THE STREET FOR THROTTLE MAX AND FULL THROTTLE; MAIN AND IDLE JETS. K&N AIR FILTER. STOCK CYLINDERHEAD BORED TO FIRST OVER, PORTED TO SPECS OF 1977 IT175 PORTS SIZE. EXPANSION CHAMBER FROM 1991 HONDA CR125 MODIFIED TO FIT. MUFFLER PROCIRCUIT FROM 1991 HONDA CR125 MODIFIED TO FIT. 4TH GEAR WILL HIT APROX 80 MPH. HAVE NOT TRIED 5TH AND 6TH GEAR. BIKE IS TOO LIGHT FOR THOSE HIGHER SPEEDS. DO NOT TRUST BRAKES FOR THOSE SPEEDS. NEED TO UPGRADE FRONT DRUMS TO DUAL PISTON DISC BRAKES.