'77 GS 750 Carb Problems

[Guest]

Hey Y'all,

I recently sent off my carbs to be worked on and the mechanic is telling me that my carbs have some parts that wont come free inside the carb and I cant seem to find a decent set of them that are in good running order. Got with my local motorcycle shop to see if I can go new but they'll run me somewhere around $700-800 to go new. I paid $1,000 for the bike is this worth putting the time in or just call it quits and get something else. If anyone has any suggestions or has a set of carbs that might work please let me know. I love my GS and I hate that she's sitting in the garage collecting rust.

Best

[chuck hahn]

MY suggestion is you follow the rebuild here. Most likely the float pins are the most common part that jams. Little heat, some oil to wick in, more heat ( but dont get too hot as then posts will melt ). Then order the oring kit from the link and get a can of Berrymans from Walmart. You can do your own carbs for under 75.00.

I also rebuild carbs. Total cost to you is 175.00. I get the orings and new bowl gaskets and ship them back to you. Turn around is about 1 week after i get them..or sooner if the bowl gaskets arrive quickly.

http://members.dslextreme.com/users/bikecliff/images/vm_carb_rebuild.pdf

http://cycleorings.com/

[Nessism]

Most likely the pilot jets are stripped. Fiddly repair but doable.

I'd focus on getting your old carbs properly rebuilt. There are very few conditions that are not repairable.

[tkent02]

If you have time, a few tools,and a bit of ability to use these tools it's a DIY job. If not there are several members of the forum here who do these carburetors for other members all the time. An ultrasonic cleaner works very well and doesn't cost all that much, the old school chemical dipping works too although it takes a lot longer. Show us a few pics of the parts that are stuck?
It's probably not anything we haven't dealt with before. These carbs are pretty simple even though there are four of them.

[xXVagabondXx]

Thanks for the rapid response guys. Chuck thanks for the PDF on the rebuild. My mechanic has the parts in a sonic wash and am waiting to hear if they can unseat the parts that are currently frozen in the carb. If they don't have luck with it chuck I may be in touch. In any event I appreciate you all helping me out and I'll give you guys an update once I have some info back from my mechanic.

[mikerophone]

I'm hoping your mechanic isn't just trying to make a few bucks. As stated some parts get stuck, but I'll second that with the proper tools, parts, patience and heat or even a dremel if needed, almost all carbs can be cleaned and perform as new.

$175 to rebuild your carbs vs. $7-800 to go "new" with your guys sounds like a deal, especially on a $1000 bike.

Also, put your bike model and your location in your signature if you plan on hanging around, for all we know Chuck might be close enough to you that you could drop your carbs off.

[chuck hahn]

Only thing Ive ever had "stuck" is a float hinge pin. I have found that someone had stripped the threads for the emulsion tube as well, but never had one stuck or a float seat stuck either.

[Nessism]

Thanks for the rapid response guys. Chuck thanks for the PDF on the rebuild. My mechanic has the parts in a sonic wash and am waiting to hear if they can unseat the parts that are currently frozen in the carb. If they don't have luck with it chuck I may be in touch. In any event I appreciate you all helping me out and I'll give you guys an update once I have some info back from my mechanic.

Make sure either you or your mechanic adjusts the valves on the engine before you guys try to fire up the engine. Lots of guys don't adjust valves which subsequently causes them to burn and damage the engine. Please don't be one of "those guys".

[chuck hahn]

Yup...adjust the valves, new oil and filter, gauge sync the carbs once shes running, and check the timing. It all matters and makes for a sweet runner in the end.

And since they are VMs, they will tune easily with a Colortune. Check out some Youtube videos of the Colortune if you want to see the basic principles of its operation. Ive not found it a very useful tool with CV carbs though.