What did you do to your Yamaha today?

Did it feel like a long lost dog showing up on you porch? Lol

 

Sort of like that.....

 

opened up my first set of hatachi carbs. bowls full of green gasoline, floats still moving
found the air jets had a cover over them may be the carbs are not original to the bike I thought this part was discontinued.
its an 83 XJ750 Maxim

 

Page 3-49 of your manual.

 

And you can't just install the rings. You have to measure and set the ring gaps before they go onto the pistons.

 

Did some paint. Still gotta clean the tank up from a little over spray BUT... for my paint job I'm digging it. No more home made camo tank

 

Ah yes the ring gap another item to the list a one or two day turn around for the rebuild is not looking like its going to happen. Back to square one.
Now I get to pull the rings off the pistons and then put them into the cylinders to measure the gap. Thanks for the reminder.
Any idea of a good set of ring compressors ? I have two but I am unable to work around the rods from the lower engine housing to the cylinder head

 

Just finished a quick how-to about installing rings. It is more involved that I realized, having assumed they came ready to install from the manufacturer. This is why I love this site. I learn something new all the time.

 

Yes, there is a sort of 'J-shaped" plate that is above the two air jets.

 

Finaly get the head back from wellding,now i can start reasembling every thing together.

 

Your fingers.
The bottom of the cylinders are chamfered so the rings can slide in.
You can also use a set of worm-screw hose clamps backed with strips cut from a cerial box.

 

Matti recommends front loops!

 

Went for a short ride today to take the gf her phone charger. As i turn onto the street hit a patch of gravel frontend slid and down i went. No real damage to me except a little road rash on my shoulder ( thank you helmet never ride with out one) and only real damage to the bike is i scratched up my right side yics cover that i spent so much time polishing. Still im lucky be careful everyone and watch out for gravel lol.

 

Be careful, and get a set of case guards. They show up on Ebay for between $60 and $100 (depending on style and condition) all day long.

 

Finally installed a new valve cover gasket with new grommets. Checked the valves and had to replace only one shim. Also, finally after 5 years I finally got that damn valve tool to work. For some reason it only works if I let the valve bucket move up about half way before installing the tool. But honestly, I think I still prefer the cable tie method. Sync'ed the carbs and took a nice ride. 8000 miles before the valve cover comes on again! Feels good.

 

Also, when I had the valve cover off for today I noticed for the first time ever a hole in the cover on the left intake corner and in the right exhaust corner with matching holes in the engine. In wood working dowels are used like that to make sure everything is matched up properly and I guess these could be the same things. However it doesn't look like anything has ever been in them. Any idea why they are there?

 

For the reason you think. There should be metal roll-pin looking dowels, but they aren't absolutely necessary.

 

I mostly went and did some lazy riding, with a short dirt excursion. This lake was nearly dry not too long ago. Now it's full.


The ride back sucked though. Winds came up from the south, so I was riding in a 30 MPH crosswind for 40 minutes.

 

I don't think any of the XJ engines use the locator pins (although there's no reason they couldn't use them....). I think their earliest appearance is in the FJ600 engines.

 

I investigated a new line of bike trailers:

http://www.eastpennwelding.com/things-we-cant-build/

 

I think you're probably right. There haven't been any present on any of the XJs that I've worked on.

 

Needs more duct tape.

 

We're planning to roll out the new, improved line featuring yards and yards of DT later this year.

Can hardly keep up with orders as it is........

 

I rode my new (to me) 1982 XJ650 for the first time today. I had it for two weeks but I had to wait for a replacement brake lever.

 

Ah the joys or reassembly- I mean this no room for ring compressors fingers worked great just took it slow and used plenty of oil in the cylinders and rings. Just finished up the cam assembly and installing the carbs. Cams took awhile, remember this is my first time so I wanted to make sure they were lined up. off a tooth one way then another. Ah they are in and I rotated the crank several times no resistance other then expected. As I mentioned carbs on throttle cable choke now just the little stuff radiator exhaust fuel tank.
Hour here hour there should or hopefully be riding by this time next week.
Thank for all the advice to those who have posted to this site.
And a big thank you to Chacal order Wednesday have it by Saturday !
Oh also rechecked my valve clearances and all are with in range-actually right next to max limit just the way I wanted them. No valve adjustment for 24,o00 miles!
Have a good Easter

 

you should have posted a no coffee while viewing alert

 

That's what I thought. But there has never been anything there since I've had the bike. I may check my spare engine and see if it has them. Seems that all those 12 bolts and grommets should be sufficient.

 

Today I reassemble / rebuild calipers with new pads and seals.

 

I took it out for a ride, but this afternoon may involve re-sync and colortune.

 

got ready for the second ride of the year, was meeting up with 3 mates, went to top up with fuel ,,,,
aaaaaaannnnnnnndddddddddd,,,, filled up with DIESEL, "knobhead."
one hour later after limping home, removing tank and emptying fuel out, refilled
and went for ride .
stu

 

Limped home- When did you realize that you put diesel fuel in? You didn't have to clean the carbs? Looks like you got real lucky on that one.
Glad everything worked out.

 

realised when I went in to pay, and it said diesel on the till.
I ran it half a mile back home, ran fine after

 

Removed wheels in preparation for new tires. They had a little dry-rot



Old and new: side by side


While I had the rear wheel off; replaced rear brake shoes.

 

I had a set of those new tires. I got 12,000 miles out of the back hope you do as well.

 

This weekend, I cleaned up the gas cap and replaced a couple of parts, then rebuilt the petcock. I've run out of reasons to postpone tackling the carbs. They should come off tonight, if all goes well.

 

When trying to figure out where my ticking noise is coming from, discovered (not the cause) that I've got a valve cover bolt that was literally falling out. Why? Because it was completely stripped, and someone attempted (badly) to repair it with a helicoil. Helicoil firmly attached to valve cover bolt, just sitting in the hole but in no way threaded anywhere and the bolt threads a nice smooth shaft of "lol this aluminum used to be part of your engine!"

Now I need to add "repair cylinder" to "need to check valve clearances."

*cries softly*

 

Got my bike running this evening here's a short video
Still need to do carb sync and Gunson Colortune Yet she lives!!!!!!!!!!!!!
Looks like I'll be riding by Thursday!!!!!!!!!!!!!!!!!!

 

What type or year do you have? Does the valve cover bolt thread into the cam cap? Just asking cause that's how mine does on the xj700x. Right through the valve cover and into the cam cap.

 

Congratulations!

 

82 xj750. Yeah, the valve cover bolts thread into the cylinder head. Clearly the last guy tried to fix it after stripping the head, but failed. I need to look into some better thread inserts, give fixing his botched fix a go. Fortunately the valve cover isn't seriously torqued down,so maybe I can find some more success.

Congrats on getting yours running!

 

Rode the bike to work... about to do a nice lunch ride

 

I could not of done this rebuild with out the guidance and suggestions from those of you who are gracious enough to share their sometimes hard learned experience.
Again Thank You

 

Yes as soon as I got home from school I moved everything out of my way and got the bike out for a ride at dusk. Oh was it enjoyable, as mentioned before need to fine tune a few things to tidy her up. Either I had forgotten how she pulled or she is running Hella good because she pulled all through the gears and RPMS. Not balls out but nice and steady. Quick jont onto the freeway 3 miles then off the freeway. Looking forward to Thursday when I go for a ride over the Oregon/California pass to set the rings. I think my elevation where I sit is about 1380 ft. and the Siskiyou pass is close to 4,310 ft. This should be enough to put a load on her and set those rings.
Going to run her up to 70% of peak power then back off for a bit then run her up again. I am not going to sit at one speed and cruise, my understanding is by just cruising at one speed does more harm to the engine.
Also every time I stopped I got aroma of freshly painted engine parts LOL, Seems to be holding together (the Paint).

 

Back again
I hope that cams are wright in position,dont have on caps any marks.

 

And one more thing how to that this dont have numbers. They are three in the midlle for exhaust,out sides have number y285

 

Time to bust out the calipers

 

Measure with a micrometer.

 

Ok,i reasembel the head with cams and measure space ,and on all four exhaust i have 0 space and on a itake on all four a lot i think somebody fail reasembling when they fixing crack on head.it is posible that are on intake with number 285 all four,and on exhaust 2x270 and 2x275 .

 

And how to get out shims if you dont have that special tool

 

Do a search for how to use a wire or zip-tie to hold the valve open. Simple technique.