• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

gs850 gt top end rebuild

  • Thread starter Thread starter mottacycle
  • Start date Start date
Datsa Noydb said:
The 0.03-0.08 spec is in milimeters, the 0.001-0.003 spec is in inches.

Both are correct, but the mm spec is MORE correct, as the inch spec is an approximation.

When you are deciding which shim to use, go with the looser side of the spec, if possible. Unfortunately, one shim size will change by the entire range, so if you are at 0.035mm, for example, going just one shim size thinner will take that to 0.085mm, which is technically out of the range. The good news is that you can safely go to 0.10mm (approx. 0.004") with no problems. In fact, the bike will run just a bit better with looser valve clearances, and it will be longer before the valves get tight enough to need another adjustment, but you still need to check them according to schedule.

If this bike is 'new' to you and you know nothing of its history, plan on checking clearances again soon, likely within 1000 miles or so, just to make sure they are still good. After that you can go to the recommended 3-4000 mile intervals.
Click to expand...

Ok i got it now. thanks datsa:cool: i appreciate the knowledge. Im a standard thinker as everything i play with is inches, so thats why i lean towards it!! also update on the head in the shop.... one of the inner valve springs is broken:eek: is that a hard part to source? and should i get a whole new set? im thinkin new set. he said the valves are good, the seats are good, valve guides good, and everything is apart and cleaned up, just waiting for my valve seals and inner spring. ima stop by and look at the head. while at all this i am really on the fence about the rings and ball honeing the cylinders that way its now a new bike from my ownership almost.:eagerness: (sorry for the horrible grammar issues and spelling just a analog man in a digital world) hard enough to post pictures on here let alone type all i need too!
 
Last edited:
one_civic said:
don't know what year your 850 is but here is a decent gasket set priced pretty competitively compared to other sellers, I choose Vesrah over Athena any day, but if you can afford OEM gaskets, go for them.

http://www.ebay.com/itm/Suzuki-GS85...60-GS850-GS-850-GS850GL-/281913875610?vxp=mtr
Click to expand...
would i be good with this set its an 81 gt with an 80 head goin on it...??? only difference between the gl/gn and gt was the full Transistorized ignition, slotted disc rotors, 4 screw master cylinder, headlight,handlebar switch, mount angles of cam sprockets, so not in engine and tranny design? gaskets should mate?? reason i ask is cause the gasket set is $159!!!! from factory
 
Last edited:
I've got some spare (used) valve springs if you want them (free for the cost of shipping). I've also got a brand new set too (not free). PM me if you want to discuss.
 
mottacycle said:
thanks datsa! for the tips. i have a service manual for the bike just didnt have it in front of me when my brain rattled off that spec lol!! but now u got me confused... spec sheet says Valve Clearance or tappet (when cold)IN. 0.03- EX.0.08 then below(.001-.003) i mean tight is right but which is it?
Click to expand...

This bold print item has me wondering if you are doing it right. The clearances between the Intake and Exhaust do not differ, if I am correct. This makes me think you are seeking a clearance of 0.03 on the intakes and 0.08 on the exhausts.
Please tell me I am wrong thinking you are reading these wrong, but I think the clearances are 0.03--0.08mm for both intake and exhaust valves.
It's just me but I always think in terms of inches and set mine in the .002--.004 inch range as opposed to the .001--.003 inch measurement.
 
alke46 said:
It's just me but I always think in terms of inches and set mine in the .002--.004 inch range as opposed to the .001--.003 inch measurement.
Click to expand...

Which is .05mm - 10mm, pretty much what all of us do. I aim for .08 but .05 to .10 is close enough.
 
yes i got it in and ex are the same clearances. just wrote it down wrong space cadet over here
 
mottacycle said:
would i be good with this set its an 81 gt with an 80 head goin on it...??? only difference between the gl/gn and gt was the full Transistorized ignition, slotted disc rotors, 4 screw master cylinder, headlight,handlebar switch, mount angles of cam sprockets, so not in engine and tranny design? gaskets should mate?? reason i ask is cause the gasket set is $159!!!! from factory
Click to expand...

Head gasket is the same for all of the 850's from cross-referencing P/N's, never knew there was an 850 GT? Where you'll run into problems swapping heads are the earlier 850's used VM carbs while the later ones used CV.
 
constant velocity carbs on her i would love some MS carbs though
 
got it all back together now those cams are tricky!!! Everything is lined up 20 pegs from 2 to 3 timing mark was still lined up turned over and good to go! lash was set correct and i should be running here after i figure out the wiring for new coils!! thanks again for all the input and help!!!
 
update got it running !!!!!! but i got no spark on 1 and i got smoke coming out my left pipe once warm...... wtf!!!!
put new coil on it thought that would fix spark didnt but i think the boot is to blame..... also timing was correct and the head went to the shop for clean up grinded valves new stem seals and the vlave lash was set to .03mm am i missing something here???
 
Last edited:
alright new update good to go the spark issue was a fuel issue got all cylinders running just need a carbs sync and should be on the road for the first ride here shortly!! i traced all wires and grounds.. even got to the ignitior and took that apart tested all resistors and transistors then when to plugs and coils made sure i wired them up right took off the carbs and noticed i wasnt getting fuel into the cylinder tore em down and cleared em out again!!!!! boom got it burning fuel!!! thanks for all the info and tips for the rebuild will post some pics when all done!!!
 
mottacycle said:
one major question about the buckets though.. they are not adjustable.... as my machine shop guru has said so this is why the valve lash must be correct. within .001-.003 in my book as i remember. to my understanding though u can use shims on the bucket to correct if needed after 100 miles or so?
Click to expand...

I'm probably just not understanding the part about using shims after 100 miles if needed, but you need shims in every bucket all the time.
 
Yes I do know that u need shims all the time.
So I got a big problem now..... white smoke out of both tail pipes backfiring and won't run off choke circuit also surging idle....
 
Not off by a tooth just counted from 2 Mark to 3 mark and it is 20pins2016-02-28 16.16.55.jpg
 
Plugs were black smoke is looking whitish blue also there is gas and oil coming out of the tail pipe it's a brownish color.
 
You must log in or register to reply here.
Back
Top