Bagger John
CB750 Member
But a thread about big-bore kits and other modifications for them to work optimally.
Several decades ago I did a Wiseco 836 kit conversion to one of mine. I seem to recall the kit included heavy-duty studs (or maybe not...) but the shop I bought the parts from made sure they were included. This outfit also did the boring work. I ran a 4-1 header and individual K&N air cleaners. No other head work or carb work other than jetting was done.
For the life of me, I can't remember which octane fuel I used...
Fast forward to the present. I want to build another solo tourer/commuter using a K7 or K8 as a base. This setup will have a Windjammer and set of Shoei SB-2s; a short sissybar/tail rack and engine guards. So a bit of extra power would be nice. An 836cc conversion is perfect; exhaust will be MAC 4-2 if I can find the right set. Also planning on using the stock air box.
Questions arise: Are the stock con rods and bolts enough for this application, or should I look to an upgrade? How about cams and cylinder head work - not looking for a race engine but to broaden HP/TQ where possible; especially the latter. Carb swap - go with the setup off a 72-76, a different arrangement (larger throats) entirely?
I ran a Barnett clutch in the original conversion and used a Lockhart oil cooler - good to have either/both?
Input welcome. I can yank the top end and send the cylinder block, head and any required parts to whomever for boring/porting and valve train work as needed, so I'm open for suggestions/guidance here.
Several decades ago I did a Wiseco 836 kit conversion to one of mine. I seem to recall the kit included heavy-duty studs (or maybe not...) but the shop I bought the parts from made sure they were included. This outfit also did the boring work. I ran a 4-1 header and individual K&N air cleaners. No other head work or carb work other than jetting was done.
For the life of me, I can't remember which octane fuel I used...
Fast forward to the present. I want to build another solo tourer/commuter using a K7 or K8 as a base. This setup will have a Windjammer and set of Shoei SB-2s; a short sissybar/tail rack and engine guards. So a bit of extra power would be nice. An 836cc conversion is perfect; exhaust will be MAC 4-2 if I can find the right set. Also planning on using the stock air box.
Questions arise: Are the stock con rods and bolts enough for this application, or should I look to an upgrade? How about cams and cylinder head work - not looking for a race engine but to broaden HP/TQ where possible; especially the latter. Carb swap - go with the setup off a 72-76, a different arrangement (larger throats) entirely?
I ran a Barnett clutch in the original conversion and used a Lockhart oil cooler - good to have either/both?
Input welcome. I can yank the top end and send the cylinder block, head and any required parts to whomever for boring/porting and valve train work as needed, so I'm open for suggestions/guidance here.