81 GS 750L Bobbed

[ShadowFocus603]

Try giving a shout to witttom in Ohio http://www.thegsresources.com/_forum/member.php?28243-witttom He has a ton of parts so if it's just a stock coil you need he can get it out to you fairly cheap (and fast since you are nearly next door). I have bought from him a time or two and will continue to do so without hesitation. Be forewarned though he is just coming back from a vacation in Deal's Gap (lucky dog lol) so he may be a day or two behind as he catches back up.

 

[Weeksz]

Thanks Shadow. I'd rather not buy another 30 year old coil that could just go bad in the near future, i'm just gonna break down and get some of those dyna greens. Will I need a dyna ignition for those coils or could i run the risk of frying my stock ignition with the greens? I'm trying to do this on a budget and I'm already way over from my original plan so if I can go without the ignition that would be best.

Any feedback would be great.

 

[78550GS]

I'm trying to do this on a budget and I'm already way over from my original plan .

Any time I make a plan and a budget, I list everything on a sheet of paper and write it down on paper for documentation.

Then I DOUBLE it. Never fails for me. after the double measure, I usually come in about 5-10% under.

 

[Weeksz]

Wiring the Coils on the 81 GS7501L

Wiring the Coils on the 81 GS7501L

So i just got the Dyna Greens DC1-1's in the mail today. I have been looking around at the install and i realize that I'm going to have to modify the mount points to get them to fit correctly. What I am not clear on is the wiring. I was reading about the "coil mod" and some relay but It sounds like that is for the pre 1980 bikes? Or will this need to be relayed on mine also??

Another question is I know that the left coils fire 1&4 and the right fire 2&3 but does the orentation of 1&4 / 2&3 matter. like which is which on the individual coils?

Will i have to adjust my timing?

THANKS

 

[Weeksz]

It's been a long winter and after frying my RR last fall I had put the bike under the tarp for the winter. finly I got some much needed parts (battery, tappet gauges, shindengen rr) and I'm trying to get this bike to start again. I'm having the same thing as I did last fall when I lost my patiences and fryer my rr with a car battery jump.

ii have new green coils, 8mm wires, new plugs (which all have spark), and a well charged battery. I sent my carbs to chef last summer for a rebuild and they came back with some **** float bowl gaskets on them so I replaced those too. I have fresh (non ethanol) gas hooked up with the "IV" water bottle method. The cranking sounds good but it will not fire. I'm worried that I'm having to much faith in the carb rebuild but I've heard many good things about his work. He asked me to pull the float bowls and make sure they weren't stuck and sure enough they were fine. I also just rechecked my timing for the second time and the valves are within spec.

can anyone give my advice here? This hasn't run since my top end rebuild (rings, seals, hone, gaskets) last summer.


what should I try next?

Sorry for any grammar this is my iPhone.

 

[Weeksz]

Bump for getting in the garage today

 

[Steve]

I have not been following your project, but was intruigued by this statement:

Sorry for any grammar this is my iPhone.

I never realized that an iPhone could do that.

I have always understood that all similar devices operated on a GIGO principle. :-\\\

.

 

[Weeksz]

Yes and unfortunately its not worth going back to risk losing the paragraphs I texted, but thanks for the help. anyone else?

 

[JTGS850GL]

When you said that you checked your timing, did you mean your ignition timing or your valve timing? If it was your ignition timing, then I'd check to make sure your cam timing is correct. Have you done a compression check? If not, then do that. It will help to narrow down weather your issues are related to the rebuild or not.

 

[Weeksz]

Thanks for the advice. I rechecked my ignition timing and cam timing after reading that, and it was off.
After another read of the manual I adjusted my timing accordingly and set my valve clearances again. Torqued everything down to its spec etc.

After that, another attempt to start it resulted in lots of backfiring. It wouldn't kick over just seemed to want and kick back out of the pipes and some air kick back from the pods (and please don't give me the pod filter speech).

I Know a compression test would do my good but I don't currently have access to one..

It is backfiring out of both exhausts. I have the two wires from one coil going to 1 & 4 and the wires from another coil going to 2 & 3. Should I try switching them?


i did Add a bit of fuel to the plug holes yesterday to try and get it to turn over, maybe this is just burning some fuel left over from that?

Thanks

 

[Weeksz]

It started! Had my plug wires switched.

 

[Weeksz]

Alright so all was good yesterday. Idled really well and revved well, made sure not to rev it high. Put it through a few heat cycles and let it idle without letting it get to hot. Put a fan on it to cool it down between cycles. Took it for a small ride down the street where it bogged under load and limped back to my house not trying to run it hard at all, probably an 1/8th of a mile. Figured it was because the carbs had not been synced and needed some adjustments. Well today I go to start it and it didn't start half as easy as it did yesterday. Once it did it seemed to be burning oil and running rough.. Almost like it was before I rebuilt it. I know I need a compression test but is this something that anyone has experienced before? Didn't seem to be burning any oil yesterday..

besides a a compression test what should I look for next. What are these symptoms telling me?

getting pretty discouraged

 

[Weeksz]

Anyone? I'm thinking that its possible maybe some cam journal bolts loosened up or something? Can't get it to start at all now.

 

[JTGS850GL]

Check the plugs to see if they're wet. Maybe flooded. Leaking petcock overnight?

 

[Weeksz]

Well this seems to be going downhill fast... My battery is completely dead and doesn't seem to want and take a charge. Not sure if the ignition was left on overnight or what the deal is but I can't get any power. What could be the cause of this? Is it possible that my r/r is fried or something?? Going to do some voltage tests today.

 

[Weeksz]

Carb Sync Fittings

Carb Sync Fittings

Was missing some carb sync fittings so I made my own yesterday. super cheap if you have the die.

 

[Spyder]

Have you gotten your running issues sorted out? still bogging? Sounds like some serious jetting issues...

 

[Weeksz]

I barrowed a Motion Pro carb sync from a friend of mine and attempted to sync the carbs and take it for another ride. Soon after messing with It I found that the consensus is that carb tool sucks, which I agree with. The fluid would never settle in the bottom tube reservoirs; it would stay more than half way up the tube with air bubble in between. I ordered a vacuum style and am awaiting them in the mail.

 

[gustovh]

Just picked up on this thread. You are running pods, and straight pipes. What size are your main jets, and what size are your pilot jets? You should be at least 3-5 sizes bigger on the mains and probably a size bigger on your pilot jets from stock, to get it in the ball park.

The bike started after sitting all winter, did you drain the carbs or use a stability additive before shutting down for winter? If not, you may have to clean them again, ethanol gas breaks down in interesting ways, and sometimes does not take too long to do it.

Just a few thoughts.

V

 

[Weeksz]

Just picked up on this thread. You are running pods, and straight pipes. What size are your main jets, and what size are your pilot jets? You should be at least 3-5 sizes bigger on the mains and probably a size bigger on your pilot jets from stock, to get it in the ball park.

The bike started after sitting all winter, did you drain the carbs or use a stability additive before shutting down for winter? If not, you may have to clean them again, ethanol gas breaks down in interesting ways, and sometimes does not take too long to do it.

Just a few thoughts.

V

Yeah, has larger jets, can't remember what size they are but I have them written down in the garage somewhere, I had Chef clean an replace the jets in the carbs after my original set was damaged by the previous owner. The bike was torn down winter of 2014 and never ran later that fall. It did turn over and but never started or ran due to some electrical problems. It did have fuel in the carbs but I only have used non ethanol fuel (or what they call rec gas in MI) in it since the carbs were rebuilt, and yes I drained the carbs when it sat winter 2015. I spoke with a fellow member Vince (thanks!) who helped me tune my pilot jets and it seems to be running ok but still a little rich, I have do back them down another 1/4 turn or so. I believe that my petcock is leaking because it never wants to start and seems flooded after I let it sit with the tank on it overnight, but seems to be fine when a buddy (waterbottle) tank is hooked up to it. Ordering the rebuild kit today.