Seca VS Maxim triple calmp differences

I am looking to remove the pull back riser on a 81-82 Maxim and convert to a straight, short riser to accommodate club-man bars. these bikes came with permanent risers, so replacing just the riser is a no go. can you just replace just the top riser from a seca, same year and be done or is the geometry of the three holes different. thanks dirty

 

Don't know, but I have a Seca 750 1982 top tripple clamp I should unload.

 

Yea i do to

 

Umm, the upper triple tree on all 750 Secas have the same cast-handlebar configuration as the '81 ~'82 750 Max, don't they?

If you're talking about converting to tubular-style bars, I believe the top triple tree from an '83 750 Maxim is what you need. (The cast bars went away for '83 along with the Atari instruments.)

 

82 (J) maxim 750 has the spline for the cast bars that comes right off.
maybe Mike has a 650

 

Edited to remove irrelevant information. OP has a differnt bike than I thought.

 

It is important to keep the triple tree (Upper and Lower) as a set. Technically, they should fit,but I have found on two occasions that the holes for the upper fork legs don't 100% align. The same applies to the engine casings....always use a matching set.

 

Definitely. Which is one of the reasons why Yamaha made the pats that the bars actually attach to as a separate part, which unbolts from the top of the tree.

 

What i have is a 81 Maxim 550 with the risers cast into the triple clamp(no splines). They have a tall riser and alot of pull back. I have the top clamp to a 81-82 seca. I thought the dimension's were the same, but i was wrong. I have the top clamp for the Seca, but Before i get the lower clamp i would like to know if these are two are compatible. Are the neck bearings the same. Is the length of the center spindle the same length. I am putting club-man bars on and with the pull back they hit the tank. Thanks Dirty

 

the center hole on the seca (Black) is higher in the triangle, the down tubes and speedometer mount holes are the same.

 

Umm, no they're not interchangeable. The reason the hole for the steering spindle is "higher in the triangle" is because the rake/trail are different between the Seca with the axle at the very bottom of the forks and the Maxim's "leading axle" forks.

One of the few significant differences between the 550 Maxim and Seca is the frame geometry, rake/trail, and front forks.

 

So can i replace the lower triple clamp to a seca and achieve the correct rack and trail.

 

You'd get Seca trail (from the triple trees) combined with Maxim rake (from the frame itself) and the end result would also depend on which fork legs you used.

Google up some pics of the 550 Maxim and 550 Seca and take a close look at where the axle is on the "end" of the forks.

I have no idea what it would end up doing to the steering/handling characteristics of the bike.

 

Your other option is to have your upper machined to the height and pullback that you need for your bars to fit. Is there a voc-ed program nearby? Teacher's love free projects for their students, and your's is a fairy easy job.

 

Also, just for knowledge base, the 650rj seca triple puts the forms a little farther forward than the 650 maxim forks. That way the Seca tank will clear. The Seca tank will actually fit on the maxim frame if the Seca triples are used.

I have swapped then to check for fit only.... I have ridden it, so can't comment on function/handling......... Yet.

Dave

 

Dave, it has recently come to light that we're dealing with a 550 Maxim here.

 

other than getting a Seca or machining off the pull back, what other options are they

 

Flip the clubmans over; or maybe go with a slightly less radical bar like a "Euro" or "Superbike" bend?

I'm running the Euro on my 550 Secas.

Here's the dimensional chart: http://www.bikemaster.com/handlebars.html

If you flip the clubman bar over (theirs anyway) you'd get a 0.8" rise rather than a -0.8" but the 6" pullback would be the same.

The Euro would give you only a 2.4" rise with a 4.8" pullback, which might work out better because the built-in risers add pullback as well.

Or the Superbike bend which has a 3" rise but only 3" of pullback; better yet?

Here're a couple of pics of the Euro bend on 550 Secas:

 

well i guess it is what it is. Thanks

 

Here is a mock up so far. I guess the 550 risers will have to work. Have to take it all apart now to paint and polish and torque.

 

But as I said, it is just for the knowledge base.........

 

Looks like i am on a quest. Well it wont be the first time. "Dumbass" Dirty