The 1979 Honda CB750 has 4 recalls, all centered on engine oil leaks that can coat the rear tire and cause a sudden loss of traction.
Two of the recalls involve the countershaft oil seal, which can split when the engine is repeatedly revved hard right after a cold start. When that seal fails, oil escapes and can reach the rear tire while the bike is in motion, drastically reducing grip without any warning to the rider. The other two recalls involve the threaded insert that holds the oil filter bolt in place. Under the heat and pressure of normal engine operation, or if the bolt was overtightened during a service, that insert can crack and break, allowing the oil filter to come loose entirely and dump oil directly onto the road surface below the rear wheel. All four defects share the same end result: oil on the tire, reduced traction, and a serious risk of losing control. These recalls affect CB750K and CB750KZ trim variants.
At a glance
What can fail
The threaded insert that holds the oil filter bolt may crack under engine heat and pressure, especially if over-tightened. A cracked insert lets the oil filter fall off, spilling oil onto the rear tire and reducing traction.
What the fix does
No remedy description available.
Summarized — see the official notice for exact wording, dates, and contacts.
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At a glance
What can fail
The engine oil filter mounting point may crack from heat, pressure, or over-tightening, allowing oil to leak onto the road and potentially reach the rear tire, reducing grip.
What the fix does
No remedy description available.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
On certain CB750KZ models, the countershaft oil seal can split when oil pressure spikes from revving the cold engine, causing oil to leak out and potentially contact the rear tire, reducing traction.
What the fix does
No remedy description available.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The countershaft oil seal can split from extreme pressure changes when the engine is repeatedly revved right after cold starts, causing oil to leak. If unnoticed, the leaking oil may contact the rear tire and reduce grip.
What the fix does
No remedy description available.
Summarized — see the official notice for exact wording, dates, and contacts.
