Honda Magna VF750C Service Manual page 230

1 1 . Check for e n g i n e ove rheati n g -- Overheati n g
N ot Overheati n g
1 2 . Accel e rate or run at h i g h speed
E n g i n e Does N ot Knock
Poor Performance At Low And Idle Speeds
1 . Check i g n ition t i m i n g
Correct
+
2 . Ch eck ca rbu reto r p i l ot screw
adj u stment
Correct
+
3. Ch eck fo r leaking i nta ke pipe --- Lea king
N o Leak
+
4. Perfo rm spark test
Good Spark
---- -- -- -- -.
E n g i n e Knocks
---- -- -- --. .
--
I ncorrect
---- -- -- -- -t�
I ncorrect
---- -- -- -- -
---- -- -- --•
Wea k Or I nterm ittent Spark
Possible Cause
Excessive ca rbon b u i lt-u p in com-
•
bu stion cha m be r
Use of poor q u a l ity fue l
•
Cl utch s l i pp i n g
•
Lea n fue l m ixtu re
•
Wrong type of fue l
•
Worn piston a n d cyl i nd e r
•
Wro n g type of fue l
•
Excessive carbon b u i lt-u p i n com­
•
bustion cha m be r
I g n ition ti m i n g too a dva nced
•
(Fau lty I C M )
Lea n fue l m i xtu re
•
Possible Cause
I m proper i g n ition ti m i n g
•
( F a u lty I C M )
See F u e l System section
•
Loose i n s u l ator c l a m ps
•
Damaged i n s u l ator
•
Fau lty carbon or wet fou led spa rk
----t� •
p l u g
Fau lty I C M
•
F a u lty i g n ition coi l
•
B ro ke n or s h o rted spa rk p l u g wi res
•
Fau lty e n g i n e stop switch
•
Fau lty i g n ition p u l se g e n e rator
•
Troubleshooting