Was installing my new carb last night and noticed how much longer the new cable was than the stocker. Directions say to route around steering stem but that makes zero sense. The throttle is so stiff I would rather run the stock carb then deal with that. Can i modify the stock cable to work? If I grind of the metal sleeve at the end of the stocker would it work? Thanks.............

 

That wouldn't help your problem that much. The increase in tension is mostly from the spring on the carb. If you got your carb from Ron Wood Racing, they install the better spring and put the firmer one from Mikuni in the box (dont use it!). There are choices you can make - that includes a twist throttle, or cutting some of that spring out. Hightower has some insight on this.

 

When I ran the TM45 I routed mine across the valve cover to the left side of the steering stem Then up to the cross bar and across the throttle. Worked great.

 

How was your throttle pull? I always seem to be left with so much slack..........

 

its true the TM carb will have a stiffer throttle, but also very true that the stock cable is superior and has a much smoother pull than the aftermarket cable, which is indeed longer than the stocker also. the braid in the stocker is finer and therefore smoother to pull, and you also won't have the excess length to route just right. you are correct, all that is needed to use the stocker is grind off the nut on the cabr end, careful not to damage the cable sleeve, and the cable sleeve will then slip right into the pocket on the carb in front of the white nylon wheel. use the little rubber booty that came on the stock cable to slip over and secure it to the pocket.

 

i have had 3 different ds's with the 45mm carb, the best set-up so far has been the cable from rwr routed around stem across valve cover. install the softer spring (rwr has them) and cut 2 rings out of the spring befor install. my thumb throttle w/ the 45mm pulls almost as easy as the stock set-up[img]i/expressions/face-icon-small-wink.gif[/img]

 

i cut the nut off the stock cable as hightower said. it works great with my tm.

 

Thank you guys for the help. I am going to try and modify my stock cable tomorrow and give that a shot. Also if a softer spring is available why didn't RWR install that from the beginning?

 

the stiff stock spring is stiff enough to overcome the accelerator pump spring so that the slide will fully close back to idle. complaints of thumb tension for people who do not wanna go to a twist throttle led to the softer spring that is available from RWR. although this softer spring makes it easy on the thumb, it is too weak to overcome the accel pump spring so the throttle will not return fully to low idle, so ellimination of the accel pumper was the next step.

if you want to use a thumb throttle with the accelerator pump still activated, you have to manipulate the soft spring to make it stiffer and find a happy medium. JEFFROE has a method I have not tried, but it sounds very easy and makes sense.

Another method is simply twisting it in the unwind direction with two pair of pliers to maked it stiffer, and also twisting the accel pump spring in the wind direction to make it stlightly weaker, will do the trick. It is trial and error, twist them a little, try it out, screw with it for a bit until you achieve the magic combo. ellimination of the accel pump to obtain a softer spring pull is not recommended, the accel pump is one of the things that make this carb (and any flat slide) rock.

I do not mean to suggest that the stock throttle cable makes the pull easier, for an easy pull the springs must be manipulated. but the stock cable is a much smoother pull.
I use thumb throttle with the accel pump, the tension is slightly more than stock but nowhere near that of the stock tension of a TM with the heavy spring. There are quite a few guys around now running this same manipulated set-up, it works great. I just wish Mikuni or RWR would just make the perfect set of springs and sell them set-up right from the get-go. Slightly weaken the pump spring, and slightly stiffen the soft return spring.

 

cable routing is a little tricky, just trial and error to get it right, good luck