This is a parts list of everything you should require at a minimum to complete a triple or quadruple bypass on a Honda CX or GL motorcycle (CX500, GL500, CX650, GL650). For more info on the procedure - and this is a work that's currently in progress - check
Part |
No. |
Part Number |
Where to buy |
Notes |
Cam chain |
1 |
14401-MA1-013 14401-415-003 |
eBay, DS (UK), DS (US), PZ |
All models take the same chain. Do NOT buy used |
Tensioner blade, manual models |
1 |
14500-470-751 |
eBay, DS (UK), DS (US) |
Only required for manual tensioner models. What are the manual/auto differences? The O-ring requires dropping the engine to replace so replace it while the engine is out. |
Tensioner blade, manual models, reproduction alternative |
1 |
14500-470-751P |
DS (UK), DS (US) |
Manual tensioner bolt O-ring |
1 |
91312-415-000 |
eBay, DS (US), DS (UK), PZ |
Guide blade, manual models |
1 |
14620-415-014 |
eBay, DS (UK), DS (US) |
Tensioner blade, auto models |
1 |
14511-MC7-000 |
DS (UK), DS (US) |
Only required for auto tensioner models. What are the manual/auto differences? |
Guide blade, auto models |
1 |
14620-MC7-000 |
DS (UK), DS (US) |
Part |
No. |
Part Number |
Where to buy |
Notes |
Front cover gasket |
1 |
11391-449-306 |
eBay, DS (UK), DS (US), BB, PZ |
Also called the transmission cover gasket. |
Clutch cover gasket |
0-1 |
11372-449-306 |
eBay, DS (UK), DS (US), BB, PZ |
You don't have to remove this cover if you are removing the front cover |
Rear cover gasket |
1 |
11394-449-306 |
eBay, DS (UK), DS (US), BB, PZ |
Thickness critical - 0.8mm required |
Pulser cover gasket - CDI |
1 |
11432-415-306 |
eBay, DS (UK), DS (US), PZ |
Only required for CDI models |
Pulser cover gasket - TI 500 and all 650 models |
1 |
30373-MC7-306 30373-MC7-000 |
eBay, DS (UK), DS (US), PZ |
Only required for TI engines |
Water pump/impeller gasket |
See "O-rings" section |
Exhaust gasket |
2 |
18291-286-306 |
eBay, AMA, DS (UK), DS (US), BB, PZ |
Goes between the head and the exhaust header |
Exhaust gasket |
2 |
18392-MK4-000 |
eBay, AMA, DS (UK), DS (US), BB, PZ |
Goes between the header and H-box |
Exhaust gasket |
2 |
18392-MG7-750 |
eBay, AMA, DS (UK), DS (US), BB, PZ |
Goes between the H-box and silencers |
Part |
No. |
Part Number |
Where to buy |
Notes |
External water pipe O-ring |
1 |
91302-415-003 |
eBay, DS (UK), DS (US), BB, PZ |
For 650 motors |
External water pipe O-ring |
1 |
91301-MB6-003 |
AMA, eBay, DS (UK), DS (US), PZ, BB |
21.9x2.3 - For 500 motors |
Water pump cover O-ring |
1 |
11396-415-000 |
eBay, DS (UK), DS (US), BB, PZ |
127x3, 126x3 or 128x3.5 O-rings fits as well, if the OEM part is unavailable |
Shift shaft seal |
1 |
91251-ZW5-003 |
eBay, AMA, DS (UK), DS (US), BB, PZ |
- |
Rear cover water transfer pipe O-rings |
2 |
94608-50000 |
eBay, AMA, DS (UK), DS (US), BB, PZ |
23x2.8mm |
Inspection cover O-ring |
0-2 |
91302-001-020 |
eBay US, eBay UK, eBay CA, eBay AU, AMA, PZ |
27.5mm O-rings do not fit - part number 91302-001-000 and 91302-001-710 aren't correct. 30.8mm. One for inspection cover on rear cover, one for front cover. You don't strictly have to replace them but most of them are well and truly flat by now. |
Camshaft oil seal |
1 |
91202-283-013 |
eBay, AMA, DS (UK), DS (US), BB, PZ |
18x28x6 |
Mechanical Seal |
1 |
19217-611-000 |
eBay, DS (UK), DS (US), BB, PZ |
Early engines will require aperture to be reamed out to fit this larger seal |
Mechanical seal Cheaper Alternative |
1 |
11H-12438-10-00 |
eBay, BB, PZ |
Yamaha item - like the Honda it's larger than the older bike seals (NLA) so this requires reaming out the aperture to fit if you have an early engine and fits properly with the later 500s and all 650s. |
Oil pipe O-rings |
2 |
91301-268-020 |
eBay, DS (UK), DS (US), BB, PZ |
Fit under front cover - one above clutch, one on oil pump - DO NOT OMIT - 13.6x2.4 |
Oil orifice O-ring |
1 |
91306-HB3-003 |
PZ |
Don't omit this either! See here for where it should go. |
Any corrections, additions or comments are welcome.