Major gearhead/GS freek wanted.

[doug_janowski]

I have a 78 GS1000, I picked up the bike for $1000.00. The guy who had it tricked it out big time in the mid 80's. For example, the head is not stock, ported and polished (smooth as a baby?s butt); two plugs per cylinder (yes 8 plugs on the bike) Dyna-S ignition, four twin tower 1.5-ohm coils. Welded clutch basket. Heavy-duty chain. RC engineering 4 in 1 header. Mikuni VM33 Smoothbore carbs with 1/4 turn throttle. This is what I have learned so far. The guy I bought the bike from is a Pac rat, I told him to find all the paper work on it, so I know what I dealing with. I pulled off the cam cover today to find not one grain of crud. It looks brand new in there. I had to do this so I could get to two of the spark plugs. Six of the plugs can be gotten to with the gas tank off, but the last to forget it. Lot for work but I think it will be a head turner.

What I need to figure out is who made duel plug per cylinder heads back in the 80,s for this bike.

Thanks all Doug

 

[Guest]

Some pics would be nice!

Tony.

 

[Guest]

Welcome to GSR. I agree, I would like to see what you have there. Mine is also a 78 GS1000, great bikes. Enjoy the site and your new bike. Ray

 

[duaneage]

YOu probably have a collector item, I am sure other GSers would like to see this head. Are there any identifying marks, manufacture names, or part numbers?

 

[Guest]

That was a common modification we used to do. Just added 4 more plugs to a standard head. We no longer do it because the Vortex heads we sell come 8 plugged.

Jay

 

[Guest]

That was a common modification we used to do. Just added 4 more plugs to a standard head. We no longer do it because the Vortex heads we sell come 8 plugged.

Jay

I would like to know where you add the extra plugs to a stock head? do you fill the stock hole and twin them? Not that common, I've never seen one.

 

[duaneage]

katman is THE MAN when it comes to GS stuff.

Post some pics of this monster before we go insane, I looked at the APE site and saw nothing with dual plugs.

 

[Guest]

katman is THE MAN when it comes to GS stuff.

Post some pics of this monster before we go insane, I looked at the APE site and saw nothing with dual plugs.

More importantly, did it have any significant positive effect on horsepower (on the dyno).......was it worth the hassle :-k .

Tony.

 

[Guest]

The point of dual plugs is to get a cleaner more efficient even burn of the fuel. More fuel burn more power.

 

[Guest]

The point of dual plugs is to get a cleaner more efficient even burn of the fuel. More fuel burn more power.

Understood ..... I wondered how much more we are talking about.....



Tony.

 

[Guest]

not a whole lot. means nothing on the streeet, but on the strip, well, when you have got the radius valves and you haven't had a hamburger for months and are as light as your going to get and you can't seem to get 1 more 1/10th out of her.......but in some extra plugs after the hotter single plugs.

 

[Guest]

katman is THE MAN when it comes to GS stuff.

Post some pics of this monster before we go insane, I looked at the APE site and saw nothing with dual plugs.

and thanks for the compliment, but, there are many here who out do me in the engine department. I would seek the advise of the guys who are doing the 1/4 and 1/8 miles. they are the best source for what works and don't and they have the numbers to back it up.

 

[doug_janowski]

Want Photos How do I upload

Want Photos How do I upload

I have photos how do I up load to page?

 

[Macmatic]

Re: Want Photos How do I upload

Re: Want Photos How do I upload

I have photos how do I up load to page?

Try setting up a free account at Photobucket.com. Its free and east to use...then once you upload an image there you just copy and paste the <img> tag it provides below the image on the Photobucket screen.

To be honest I hardly ever remember which of the three tags it provides is the one I want here so if you post the it and the link show up instead of the pic just edit your post and paste in another one. ...but I'm pretty sure you're looking for the one the looks like this: <img>pic URL here </img>


/\/\ac

 

[doug_janowski]

Hope this works PICS

Hope this works PICS

I put white pens in the stock locations of the pluge (1-4) and Yellow pinsels in (5-8)

Photo1 Polished intake
Photo2 Left side old bike
Photo3 Same
Photo4 duel tower coil
Photo5 Cyl 1&2
Photo6 Cyl 3$4
Photo7 Carb break down (Mikuni VM33 Smoothbore)
Photo8 4 duel tower coils

Thanks all

 

[duaneage]

Rad.

Looks like a lot of work to do that mod, and a lot of work to change plugs!. I would be afraid of stripping a plug out. Someone put a lot of money into that head.

 

[Guest]

I'd sure like to see the combustion chambers of that head..

 

[Kaptain Ketchup]

That's some pretty serious headwork for a fairly otherwise stock bike (stock looking frame and wheelbase at least. It even has the stock looking head stud acron nuts). I would like to see a pic of the rearsets that are on that bike. The combustion chambers, as katman noted, along with any exhaust side work would be cool to see. Not sure if these were COTs heads (Commercially Off the Shelf) but any daring and competent race shop, back in the day when this thing was made, would be willing to take on this task.

Let us know what other "goodies" you find if you dig any deeper into the engine.

I'd keep an eye out for clutch/tranny/crank mods if you pursue to tear this thing down (pics always keep the forum happy!!). It could just be an "old school race head" swapped onto a 1000 over the years or you could be looking at an entire engine swapped into that bike.

Just my two cents.. But my next step would be to verify the dislacement, pull the clutch cover to see what lays hidden underneath, and determine the cam specs. (look for I.D. stamps, determine lift, duration, etc.).

A cool GS find anyday!!

P.S. I already saved all of the posted pics to my desktop to save in my "GS oddballs" folder.

 

[doug_janowski]

Up Dates

Up Dates

Well from the guy I bought the bike from he told me wanted to keep it looking like a sleeper. Its clutch basket is welded as well as the crank. He was going to do more to the bike but a buddy splashed while they were riding and he quit riding after that. He has all the paper work some where in a box. HE NEVER TRASHES A THING. When I get him off his butt I will post any thing I learn.

 

[marcovandevelde]

For 8 plug heads look at http://oldskoolsuzuki.info/patrick/projects/craig/page2.htm

Craig has done this to his gs1000 racebike.

Grtz, Marco.