Thought It Was the Idle Air Screw. . .

[tconroy]

New to the forum, lets see what happens
I bought a '78 Suzuki GS400 in parts. Put it together, everything was running great. . .noticed the idle out of wack - one of the carbs (2 carbs) was missing the idle air screw. I've exhausted my resources to find the correct screw (bike bandit, carb specialists, dealership, specialty shops, etc.)- no luck. Put a different screw in from a 450, the bike ran ok, but it's not right.

Now new problem, the bike is running on one carb, totally messed up. Is this in relation to the one screw? Is this unrelated, a problem with the valves? Have I created a new problem and now need to rebuild the engine?

Any advice, this is the first bike that I've built and I can't believe I got so far to be stopped by one screw!
Thanks

Did you put an o-ring on that screw?

[relic-rider]

The Screw Came in at the Local Dealer after 2 Weeks

Thats cool. Sometimes you just have to wait, as there ARE parts still lurking out there in bins that sometimes aren't on national databases. Sure is quiet around here now, huh, Mr PL. chirp...chirp. Please keep your personal attacks on members off of this forum. Some members do know more than others, but none know everything.

[simon_C]

Did you put an o-ring on that screw?

^^^ what he said
ran into the same problem with a minibike actually a long time ago

[suzukigirl]

Yes I did put an o-ring on the screw. I looked through several carbs for a screw that matched mine from similair models and years and couldn't find anything. I was lucky the dealer was able to provide the correct screw.

I'm going to rebuild the carbeurator, seems like it'll run great and then get clogged, start a run great again, then get clogged. Glad I have all the parts now

[Calvin Blackmore]

This is great news for you. I am very glad to hear you got your parts as I have been prusing ebay with a handy stored search and have found nothing since you last posted. so these are rare birds or maybe the barn owners that are storing them have no internet?

Cleaning carbs is a fun experience what with the little parts and the carcinogenic chemicals.

Im a lazy man so I would try dumping an appropriate amount of seal safe injection fuel system cleaner in my tank.

[suzukigirl]

Update

Just to let everyone know. . .
RTV silicone dissolves in gasoline and becomes a gelatinous mess. This WILL clog your jets and cause the bike to run wrong.

That was the BF, but we're running great now

[tconroy]

Stay away from silicone!!!! BAD STUFF!!!! Always use o-rings or gaskets, nothing else.Bad silicone,Bad!!!