another new old bike in the garage

Hey all,

So I wound up picking up an 81 750 SECA (American bike from NH) last night. Needs a few things as expected (instrument cluster, headlight, seat recover, various other bits and pieces) but the engine seems sound and has 130psi across the board (16,000 miles). I'm looking forward to tearing into this and getting the valves adjusted and running well before worrying about the cosmetics. A few pics will be posted later, wish me luck!

Marcel

 

Re: New arrival

WELCOME from TN!!!

skillet

 

Re: New arrival

thanks skillet, i've been here for a while, maybe i'll update the topic

 

Welcome!

I've been doing some changes on my bike, 750RH Seca and have some of those parts available, square headlights, instrument panel and a few others. Send me a list and I'll see what I have and maybe we can work a deal.
Bill

 

Way to go Marcel. Nice to see you have a bike again.

MN

 

Nice. Glad your back in the game. Sounds like you got the right project too, and your smart to start with the mechs before the cosmetics. At least when you get there they will all make the bike look nice and new.

 

I'm just down the road white, lemme know if you need anything, i've got yics blockoff if you need it (no colourtune or carbtune tho)

 

Sounds good guys, thanks for the support.

Krs14 I have a colortune and carb sync (well, a motion pro with bubbles and a loan of a set of air gauges ). So far no real surprises, except for one of the smaller looking cooling fins that appears broken off, no biggie hopefully.

 

When you going to post a picture mwhite74? Glad you have a replacement in the stable.

 

Here's a couple snaps to give you guys some idea the fun in store for me . I believe this bike should be pretty rare, had no idea they ever came in black... BTW ground hugger, cool avatar lmao.

I have side covers, tank has a few dings. Crash bars are going on, no f**king around this time!


Let's play spot the missing fin! It fooled me, but I don't think it'll be an issue and I didn't even notice it. Oil is coming from the valve cover, I think i'll throw the 650 cover on where she's not going anywhere.


Notice the imperfection in the engine case where the right side cover attaches? that freaked me out for a second (jb weld?), but it looks like it's just something that happened during manufacturing. PO gave me some nice allan head screws!


Here's why I need new gauges and headlight...

 

Hey guys, I guess i'll just update this thread as i fix stuff, shag it...

So far so good, just checked all my shim clearances and even though some are tight, none were under .10mm!

1 in .10mm, ex .13mm
2 in .12mm, ex .17mm
3 in .13mm, ex .19mm
4 in .13mm, ex .19mm

Compared to Maxin, all but 1 i believe were less than .04mm. if all goes well this bike should clean up pretty well. Not perfect but mechanically very sound.

 

The tank decal looks like it was borrowed from an RD250/350LC.

 

Yeah, totally... Snapped this photo at a bike show a year or so ago:

 

HEY now!

 

Love the paint scheme, tired of using that shim bucket holding tool... I may have stripped one of the valve cover holes . Switched over to using a heavy piece of wire to hold the valve over, way easier... Now to find a 265 and a 290!!! I think the top is coming off of poor old maxine tonight as she may have what i'm after...

 

Great news, got the valves adjusted and the one i was missing (290) was a straight up exchange at a local shop. Have a headlight coming from somewhere and a few leads on a new set of gauges. No stripped screw as previously thought!

The 650 (valve)cover fit like a smack in the mouth and the carbs are now off. Man o man though, what a Pain in the a$$ getting them off of the seca compared to the maxim, no space even with the airbox shoved back!

Other than that there are a few missing screws which i pillaged off of the wreck, and the intake manifolds look pretty cracked, will probably just take the ones off of the 650 there as well, ha! Just a little scared of snapping off of the carb screws as per the norm. The work continues...

 

So far so good guys, got the pipes off and they appear to be the same as the others off the maxim, and no broken head studs so far...

Crash bars are on, need a petc0ck rebuild by the looks of things... the exhaust is the same as what was on the 650, so there'll be some more swapping there too.

The final drive oil was black , if i didn't know better I would swear it was plain old motor oil. Still debating trying my luck with the intake manifold bolts...

 

Manifold bolts are off, none broke!!! The petc0ck from the old maxim looks like it will fit in the Seca tank, can someone confirm if that is a direct swap?

 

From the Fische:

81 Seca 750: 3AL-24500-00-00 FUEL COCK ASSEMBLY 1
83 Maxim 650: 3AL-24500-00-00 FUEL COCK ASSEMBLY 1

Looks like a match to me

 

Thanks mtrbikecrazy55, shame on me I could have looked myself eh!

Some more updates, got the back axle swapped with the old maxim (the Secas was broke off at the cotter pin), Back brakes look ok with no delamination. It always surprises me how little they get used!

The clutch and brake cables lubed up nicely, still looking for a straight brake pedal, but that will come.

A few pics (for you maxim-x haha!)

New pipes for for the lawnboy (some slight surface rust but pretty much dent free


some rust in the old tank


crash bars are on!


What in the name of god is this? just kidding, fuel gauge sending unit, new territory for moi!


carb buddies, (650s on the left, 750 on right) the little metal plates on top of the air jets, can i toss those??? Splitting the Seca rack should be interesting to say the least!


New headlamp, thanks trophybird!!!


touchup job on the left, to be done on the right. nothing special but it was pretty rusted after some slight Road rash


no broken studs! sofa king happy!


Spaghetti anyone!?


the 5 foot view