GS700E_Top End Rebuild_Stuck At Camshaft Install

[eil]

Do you know if these carbs need to be vacuum synced or will a bench sync do the job?

Both. Do a bench sync after reassembling the carbs and a vacuum sync once the bike has been put back together as a bit of final fine-tuning. It should run on just a bench sync, but will run well with a vacuum sync. If you don't have a vacuum synchronizer, the favorite here is the Morgan Carbtune (google it). Ships from the UK, is a little expensive, but is simple to use and high-quality.

I've been trying to find info on how to do the vacuum sync but haven't came across anything.

No offense, but you haven't been looking hard enough.

* Your factory service manual has the procedure
* There's a BassCliff tutorial here: http://members.dslextreme.com/users/cbsaunders/gs/carb-balance.pdf
* There are many threads here on the forum about it
* There are YouTube videos as well. These are usually for different bikes but the overall procedure is the same.

Also, I have a Carbtune and possibly a free day or two this upcoming weekend...

 

[2BRacing]

You were absolutely right. That was an easy fix. Almost done adjusting the valves, once that's complete I should have it all back together in no time. Thank you thank you for helping me get past those speed bumps. Do you know if these carbs need to be vacuum synced or will a bench sync do the job? I've been trying to find info on how to do the vacuum sync but haven't came across anything.

You're welcome! Well done for hanging in there and getting the job done correctly!

Yes, as indicated by eil, the carbs should be initially set with a bench synch, then vacuum synched once the engine has been properly warmed up (put a fan or two in front of the engine to blow cooling air while you are doing the adjustments). The synch tool must first be adjusted so that all four readouts are the same when connected to only one cylinder, and then connected to each individual cylinder.

After the vacuum synch process, and while the gauges are still connected, you can fine-tune the mixture screws by tweaking each mixture screw slowly until all gauges show the highest vacuum reading (this corresponds to highest idle method of adjusting mixture described on BassCliff).

I suggest you find out what kind of beer is member eil's favourite, and take him up on his kind offer!

Good luck!

 

[Sean]

No offense, but you haven't been looking hard enough.

You can offend me all you'd like as long as I keep getting all this great advice lol

Not sure why but sometimes I look and look and look and can't find what I need on the internet. You are surely a life saver... so what kind of beer do you like eil??

 

[eil]

Eh... I'm not cool enough for beer, I mostly drink water.

Looks like I'll probably be free both Saturday and Sunday. Slight preference for Sunday, but it may depend on the weather. Do you have a preference?

 

[Sean]

Taking this convo to PM check your inbox eil.

I'll update everyone and post photos once everything is back together

 

[Sean]

Got a couple updates on the bike. First, thanks to eil for coming by and helping out all day this past Sunday!

We managed to get the engine completely reassembled and running by the end of the day. At first it was running rough, then I spent some time with it after eil left and got the idle to settle. Took it out for a test drive that night and it rode great, rode it around my area for 30 - 40 mins. The next morning I took it out for another test drive and as I was riding down 5 mile it made a few odd noises, stalled out and refused to start. Once I figured a way to get it home I popped the valve cover off and found that the sprocket on the exhaust cam had came loose, one screw completely out, the other partially and of course a broken cam chain.

So how bad is it? Do I have to take the whole motor apart now to get at loose pieces and replace the chain. It doesn't seem like there is a quick way to do this. Let me know what you all think.

Thanks fellas,
Sean

 

[jimb12]

Yes you will need to split the cases. Check the crankshaft for broken teeth on the cam chain drive. Look for any other carnage down there as well.

When you put it back together, clean the bolt holes in the cams and sprockets (plus the bolts) with rags soaked in brake cleaner (evaporates) followed by a dry rag. You can use a small screwdriver to push the rags into the holes. Once they are clean, dry, and completely oil-free, then put loctite on the clean bolts and torque them into the cams/sprockets.

 

[eil]

Yeeouch! What a crappy thing to have happen on a freshly rebuilt top-end.

My understanding is that a broken cam chain generally means bent valves as well. You have a second head, don't you?

 

[eil]

Hey Sean, have you formed a battle plan for this? I might have a few free weekends coming up before it gets cold and I'd be happy to drop on by to help. (Also need to pick up my IV tank if you won't be able to use it for awhile! )