185 exhaust question
I recently tore apart my 185 and 200e Big Red for top end rebuilds and I had a question regarding the exhaust on my 185.
First of all, although my 185 was running a wiseco piston, I am going to replace the jug and piston with a stock 200e jug and piston that I have due to the fact that the original jug was chewed up from the previous owner letting the timing chain slap too much and it ate into the cylinder side of the jug's timing chain opening. So, it is going to be a 200 instead of a 185 after the rebuild is done.
Anyway, my question is this, the 185 has what looks like an aluminum baseball bat cut down and clamped into the stock head pipe for an exhaust. It is angle cut on the end, but there is no restriction in the exhaust at all such as any baffles or anything. It is fairly thick walled aluminum too, so the opening where it is clamped into the stock headpipe is only about a 1/2 to 9/16 of an opening in the center.
Will this cause any problems being a straight through pipe without any kind of backpressure, other than the restriction from going down to such a small hole where it clamps into the headpipe and the obvious noise level?
The loudness isn't a concern where I ride and actually it has a pretty good cackle when you rack it out, so I'm mainly concerned about how this will affect the performance of the motor and whether or not is needs to have some more restriction to have the proper backpressure for the motor to run properly.
Will it cause a problem being such a small opening where it clamps into the headpipe as well?
I do not know how much, if any, backpressure these motors need to run right, so I thought I would throw this one out there for the motor and exhaust gurus on here.
How will this exhaust affect the carb adjustments or jetting? It seemed to run great before, but it smoked, so that is why I tore it down to rebuild the top end. It didn't seem to run too rich or too lean. Also, it is running a stock style air filter with an outer dust cover on it inside the stock air box as well. I don't know how this will affect the exhaust decision, but I wanted to point this out.
Does anyone have any suggestions for an exhaust on this bike, other than shelling out a couple hundred bucks for a new complete exhaust? The budget is pretty much tapped out after top end rebuilds for both bikes, so I'm hoping to either run the exhaust as it is for now, modify the current pipes, or build up something from scratch even if possible, but buying a new exhaust is pretty much not an option.
As always, I greatly appreciate any and all replies.
Thanks!
Last edited by jbandb; 09-01-2009 at 05:04 AM.
John
~1983 Honda Big Red 200
~198? Honda 185
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