Ummm, fellas, i'm not trying to be a stick in the mud here but are we building a road racing bike or one for drag racing??? While the seat looks great and is practical on a RR bike. the rearward position really isn't practical to launch a dragbike. The riders weight will be positioned toward the back to middle of the bike. On a no bar bike you really want that weight as far to the front of the bike as possible- check out the outlaw or grudge bikes to see what i mean. Since the motor on Sams bike has been pumped up and the convertor stall increased, the bike will really want to leave hard. With the bottom end torque from the SOHC motor, the front end will want to climb right off the hit. You need to keep all of your weight forward on the bike. Also, do you guys intend to leave those struts on the bike? I hope they are merely there until you get a good set of shocks to help with weight transfer. Again, i'm not trying to step on any toes and I'm not an expert but i have built a few no bar bikes and feel this set up might need a second look.
Forgive me if i have offended anyone. I am only offering my opinion based on personal experience.
Yes, i know the saying about opinions- i'm just exposing mine to daylight- lol.
OK guys, as we all know, setting the bike up (or any bike for that matter) is the most important thing if you want to get the best from it.
The idea was to make the riding position, the wheel base and ride height all adjustable.
The seat allows the rider to get further forward than the stocker as the gas tank is shorter and long enough to let the rider slide back after launch and into the tuck position, so it's not really what you might call a road race seat.
The idea of the struts was to lose weight but if need be we could swap back to the shocks if they caused to much of a problem.
The RC 3 position swing arm was to hand so we decided to go with it in case we needed to extend the wheel base if the bike turned out to be prone to lifting the front end.
The arms needle roller bearings and their housings were shot so were replaced with plain bushes as the arm would not be going up and down. This was where all the problems started. We found out the the arm that was made for the CB750 would not allow the shocks or the struts to line up as the frames top rail and the stock swing arm are heavily cranked out to the left unlike the CB750 so the struts had to be made with quite a big offset.
There is a picture, 3rd down in the 2nd set on this page that shows the offset.
http://forums.sohc4.net/index.php?topic=61876.150#top we will just have to live with it as the shock will not fit the left side of the bike with out some trick conversion.
To add insult to injury the clevis on the bottom of the struts was made to short and the 2 rails on each side of the arm where the struts locate will have to be notched to allow the clevis to line up with the holes if we need to lower the rear end.
Another day, another challenge, we'll get there eventually
Happy New Year everyone.
Sam.
