Uploaded September 2020 | Updated September 2026, 3 weeks ago

---

The Broken Moto Show - Episode 6

Weak Spark & Rich Sputter


Join Matt and I as we dive into questions riders are in need of some help with.


Submit questions to: askbrokenmoto@gmail.com
motorcyclemd.com
howtomotorcyclerepair.com

Question 1: Joe from Northern California. No real question, just chinese scooter talk.
Answer: Try retro fitting quality parts on your scooter.

Question 2: Eivind from Denmark. Weak spark at contact breaker. Spark visible at points system.
Answer: Usually a bad condenser depending on if the “no spark” is isolated to certain cylinders or all of them at once.
Links - What is the MotorcycleMD Inner Circle?
“Adjusting points” video from MotorcycleMD


Question 3: Dave from northern Virginia. 1975 Honda CB750. Sputtering at ⅛ throttle position. Recently went from 40 to 42 pilot jets.
Answer: Sputter is too rich. Dave reinstalled 40 pilots and the problem pretty much went away.
Carb clean video - howtomotorcyclerepair.com/cb750carbs
Engine rebuild - howtomotorcyclerepair.com/cb750enginerebuild

Question 4: Honda CB mechanical slide carbs are binding.
Answer: Start taking it apart and see what is binding. You need to isolate the problem.
Honda CB carb clean videos:
CB750: howtomotorcyclerepair.com/cb750carbs
CB500, 550, 650: howtomotorcyclerepair.com/cbcarbrebuild

Enjoying The Broken Moto Show?
You can now show your support by
BUYING US A BEER!
gumroad.com/a/995423347
howtomotorcyclerepair.com/codymattbeer


Thanks,
Cody & Matt