Questioniam building a single cylinder 200cc honda xlr for dragracing. my problem is weak igniton very tiny sparks. what carburator size in mm. what is the ideal final gear ratio. the modification i have so far are - port and polished,stainless big valves,ceramic coated piston,combustion chamber,valves. lighten crankshaft&flywheel.stronger valves springs.
AnswerHi David,
Q: my problem is weak igniton very tiny sparks.
A: Perform electrical diagnosis to verify the integrity of the charging and ignition systems.
Q: what carburator size in mm.
A: You'll have to do the math and figure the appropriate size carburetor needed. I recommend Lectron carbs.
Q: what is the ideal final gear ratio.
A: Again, you have to have do the math or learn from experience which final gearing produces the best results. Most racers keep a wide selection of sprockets in their spares kits for tuning.
Fianl drive gearing ratio is 3:1 or make changes in three point incriments on the rear sprocket and one point incriments on the front sprocket.
Q: the modification i have so far are - port and polished,stainless big valves,ceramic coated piston,combustion chamber,valves. lighten crankshaft&flywheel.stronger valves springs.
A: Nice mods. Keep plenty of spares and gaskets handy for the frequent rebuilds associated with maintaining the engine.
Respectfully,
Mark Shively
