So I just had to share my potential solution to my "clicking" issue.

On the whim of my buddy, i thought I might be dealing with a worn wrist pin. I tore the whole top end apart only to find that the wrist pin was fine, as was every other component.

As I talked to him about replacing the gaskets for the base of the cylinder and head, he started telling me that the fact that I put a paper DIY gasket at the base was probably my problem. Apparently my "deck height" became too low when the paper gasket got crushed into position and the piston was juuuuust barely touching the valves. There is no evidence of this on either the valves or the piston, but I imagine that if the "touch" is small enough, there might not be any real indicator aside from the noise.

So I'm off to get the proper gaskets for the cylinder and head... Let's hope this takes care of it.

sounds resonable to me..also, since you increased the squeeze factor a bit..perhaps a little detonation? it does sound a little too consitant though. Besides..the compression is what, 8.5/1?

Hello all! I have been reading this thread with great interest. I just recently in the last few days have gotten my hands on a couple of these 600cc Yamaha bikes and and am really pumped about getting them in shape.
Now I have to confess that I am a severe novice on these machines and have a large learning curve to go through.
I have for some time been looking for a big Yamaha 4 stroke single to build and now I have two!
Now this may seem a sacralidge to all those who are die hard dirt bike lovers but these two bikes are going to be built up in two totally different paths. One is going to be restored to it's original configuration. The other is going to be built up as a cafe style road bike. I have a 1984 Honda xl350r that I use for commuting but it really is kind  weak on the highway and I think the 600 will much more up to the task,
Anyway, I have these bikes and the problem is that I am not up to speed on what differences there are between the TT and the XT.
So I have some pics here of the bikes and the numbers for each and was wondering if you all can tell me what do I exactly have here?
After reading this thread I am impressed at the work you all have done and the info and tips will be a big help in my builds.
Which manuals is the better one and are factory manuals available?
Where have you all found your engine parts? Is there a page somewhere that has some resources for parts and info?





Alright, I gave $150 for this one. It has stickers saying "TT 600" but they are not factory.
This is the one I am going to restore. It is mostly complete. The steer head tube says it's a '83 model
The guy I bought it from said it has a bad stator but otherwise was a good runner
















This one I gave $50 for. It is going to be modified and turned into the cafe bike. It has issues as the guy i bought it form said the engine was making cam chain noise and was starting to tear it down, then quit and lost some of the pieces. The bike is in pretty beat condition. I have 0 idea on the model but it is a '84







http://img.photobucket.com/albums/v11/soonerbills/th_018-6.jpg

Can I just start off by saying how stupid I feel looking at your pics! I bought mine for $300 and have had to put LOT more money into it just to get it where you're starting...

Regardless, welcome! And I look forward to hearing about your progress. If you have any questions, we are happy to help!

Thanks!
My biggest concern is knowing for sure what models they are and what the main differences are between the XT & TT
Then I need sources for parts for rebuilding the motors.
I read about the noise your bike was making. Did installing the oem base gasket cure the issue?

First off, the XT had a steel tank, turn signals and was more or less meant as a road bike that could do dirt (hence the steel tank). The TT is the opposite, though some did Cole with signals. A LOT of parts are interchangeable between the two.

As for mine, I still have to get my hands on a gasket kit so I can get back to work. I'm waiting to get some clarification on some kits I see on eBay before I buy one... Holy crap are they expensive too!!!

Where do you plan to start? The red one looks like it's pretty much there already!

For the moment I want to see if I can get the bike with the complete motor to run. I ordered a Clymer manual so I can do the proper tests to see what is the issue with the stator and ignition. If I can get it running then I will do a quick tear down of the frame and body, do some cleaning and detail cleaning and put it back together. I'll get some lights on it. i will have to get a title for it which will run a $100 or so through one of the local title services.
The other bike is going to be more of a project. Lot of mods to do on the frame and I want to do some performance upgrades on the motor. if I can find some that is! I saw a pic of a bike on a earlier page in this thread that had a low exhaust pipe. sure would like to find out where they got that one.

The bike without the seat is an XT..The rear foot pegs are a dead give away..and of course, the battery tray.

Welcome Soonerbillz – The Clymer will do a good job explaining the difference between them.
Basically the TT & XT have the some motor (with the XT running a 12V electric vs TT 6V).
The frames and secondary components are a mix and match between same and different. You have one of each so that will get you  a better idea.

You can get parts online (bike bandit, ThumperTalk, etc) or from your local dealer. Looking at the pricing online will give you a better guess as to what is still available for them. I haven’t needed to get anything yet that’s not available.

Thesyk-I got a full gasket kit from Bike Bandit for $70, not sure what the main gaskets run separate.

Thanks for the heads up on difference between the two.
I have heard the TT has a different chromium cylinder liner from the XT Supposedly you are not to bore it or hone it. The XT is  a regular iron one that can be bored out. Don't know for sure but I read that somewhere.But for sure there is quite a bit of difference in the details. I think the XT will make the better cafe bike. It does have the metal tank. I was going to temporarily swap the stators but if they are different I will just find another replacement. If that's what it really needs.

Quote

That's Correct. The Cam is also apparently slightly different in its timing too... but I do not know this for sure.

So which is considered the more performance motor? The TT or the XT.
I'm looking for performance mods that I can do and other things... strictly in the planning stages right now.
The TT is really complete and I think if the stator is shot I will swap out the XT parts to it just to get it fired up for now.

The 1983 & 1984 TT600 had drum brakes and they were 6 volt. 1985 & 1986 TT600 had a front disc brake and were 12 volt. The 1983 and 1984 TT600 serial # starts out 34k. The 1985 and 1986 TT600 starts out JYA. The XT600 were 12 volt. The serial # start out JYA

Edited by scooter-mike, 30 June 2011 - 05:49 PM.

soonerbillz said:

The TT engine..Mine Kicks tail..You said your stator was bad in the TT? They're all over Ebay, though not cheep but then again, none are. You can use the XT stator and rotor on your TT engine. My stator has two wires for power..one puts off 7.2v d/c (yellow) and the other 14.1v d/c (white)..I found a reg/rect that'll work for mine and make 12vd/c out of the 14v wire with full pulse, single phase.

FYI.. the 34K at the begining of the frame number is on '83 and '84 only for the TT.

blazer7671 said:

Thanks for that. I met a guy that built/worked on these motors from Tulsa. He said the peak hp was about the same on both versions in stock form but the TT because of the cam was had more lower end torque. I am going to be useing parts from the XT motor to get the TT fired up. Hopefully I will get a chance to do something with it over the holiday... Keep you posted!

Hi Blazer? I'm currently building my two tt600s as well and trying to make them street legal. Their both the 83's. I bough a universal light kit with everything in it including the battery which is small enough to fit behind the front head light. I just want to know what I need to do to convert the 6v to the needed 12 volt besides switching out the stator and rotor from an xt which i dont even know how the wiring would work out on that. Im mechanically inclinded but not very electrically inclined ha ha... so any help would be awesome! I aso understand I'll need a regulator/ rectifier? I dont even know how to hook this wiring to the battery so it will charge? I could run all lights and everything off the battery alone but then it'll drain on the highway so it would be really good to charge while riding. Any help would be awesome!
Thanks

Sorry to impose on your thread tim.

Hi Cubo,

No worries about the thread - thats what its for (since I'm mostly done my build anyways )

For the wiring, follow the wiring diagram in the back of the Clymer manual. Thats what I did and it appears to work great. If you can use an XT wiring harness to start that would help a lot (as it has all of your wires and connections already). Else you may have to make your own harness supplements. Not sure if you can still order the harness from Yam but the PN is: 49M-82590-00-00

Cubo, check your P.M.

Ya, sorry Tim. You've got the most active TT thread I've seen so far..I have a thread on R/CGroups that's now a meeting hall of sorts for guys on the front range of Colorado..So hows YOUR thumper doing? Any more ride time on 'er?

Blazer It wouldnt let me P.M. you back




that information is great thanks for all the help! so from my stock rotor you believe there is a 14v connector? Im a little confused that the 6v stator would produce a voltage that high? From what I have read people have had to switch out the xt600 stator and rotor because its a 12v system (double the windings). To test if my bike would produce these two voltages I would just put a volt meter on in series while the bike is running?

Thanks,

This site is a Yamaha vin decoder web site. www.motoverse.com/tools/vin/yamaha.asp