Started the swap late yesterday afternoon, finished about an hour ago. I had reason to change the engine. It decided to loose oil pressure at an idle the other day. That sealed it's fate.
I've been running a Seca rear sprocket for over a year, in combination with a 17t front. That combo had the engine revving slightly higher than a stock Maxim. It will be interesting to se how the Seca 6 speed transmission gearing compares.
Sounds like it. I know the intake cam was wearing after a valve adjusting shim exploded a couple years ago (I kinda may have possibly over revved the engine once in anger). And I have laid it on it's side a couple times while off road. No plans on rebuilding the old engine at this time, but it will be kept for spare parts.So you think the crank bearings are gone now? Will you open it up for a rebuild? How many miles on the seca motor?
How do you like it so far?...does the lighter crank and extra gear give a little more pep or not...curious as my Seca engine is in the bike but has not been fired as of yet...Sounds like it. I know the intake cam was wearing after a valve adjusting shim exploded a couple years ago (I kinda may have possibly over revved the engine once in anger). And I have laid it on it's side a couple times while off road. No plans on rebuilding the old engine at this time, but it will be kept for spare parts.
The Seca motor is a complete unknown. I paid $50 for it because it wouldn't fully turn over by hand. Found the cams were timed wrong and corrected that. Did a cold leak down test and both cylinders were at or below 5% leakage, the lowest reading on my tester Up to 40% is considered acceptable. Figured I'd take my chances and install it.
I just completed the first real test run and had to reduce the idle speed 1/2 a turn from what the old motor needed and lean out the Pilot screws. Other than that, she runs well, is mechanically quiet, charging system is good, clutch is smooth, and all the gears are easy to select. The engine certainly isn't pretty, but I'm confidant about riding tomorrow for work. Will give it an oil change after a couple days riding. And try to make it look nicer as time permits.
Only street riding so far. The lighter crank has taken some getting used to. The throttle response is much more direct, so I'm having to pay more attention when starting from a standstill, and to achieve smooth shifts. More vibration is felt at idle, but not horrible. Acceleration and engine braking are noticeably more aggressive compared to the Maxim engine, even with the 17T sprocket I currently have installed. 6th gear is great for the highway or cruising, but not useable in the hills or with a strong head wind. I'm certainly doing more shifting! I'm going to do some careful measuring to see if I can drop down to the stock 16T sprocket to raise the RPM's up to stock. That should also help when I'm in the dirt, I hope!How do you like it so far?...does the lighter crank and extra gear give a little more pep or not...curious as my Seca engine is in the bike but has not been fired as of yet...
Stock would be 110/90 for the rear.I got new Avon AM26 Road Riders! 100/90-18 rear and 90/90/18 front.