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Old 10-27-2012, 10:44 AM
Outster3 Outster3 is offline
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Bobber Build 79 XS1100 Special

Hey guys,
Ive been reading a lot on here with issues trying to bobber or convert an XS1100, specifically the 79 Special. Maybe I can help with a few sugestions.

The first topic Id like to cover is the carbs that came on a 79 XS1100 Special. They are different then the 80 and so on. So you can not swap parts or even get a jet "kit" for the 79 like you can on the 80.

The solution I have come up with based on other information I have researched and read.

If you want to keep the 79 Carbs, but you want more power, you can buy seperate jets for each carb. The stock 79 came with a 140 Main Jet and a 42.5 Pilot jet. So I stepped it up to a 145 Main Jet and a 45 Pilot Jet for the Mikuni Carbs. This will allow for the lack of a air box and the lack of mufflers. With this set up you can run seperate air filters on each carb and modified exhaust. I recommend getting a set of carb tuners to assist in setting the carbs on PERFECTLY for the bike. If you are unsure how to do this, I am sure you can find videos on youtube or a local shop, using a dyno can help you with this. So what I am getting at is YOU CAN rejet the 79 Carbs.

Moving on the rear end, if you are looking to bobber it, most bobbers are rigids. Depending on how much work you want to do you can do a variety of things to the rear. I read somewhere, a guy complaining to another about how he went from his down tube right to where the shocks on the swing arm would mount, stating that the guy who did it like that was a moron because you loose the motion in the swing arm. I would like to say, THIS MAKES THE BIKE A RIGID. If the swing arm moves, its no longer a rigid. A couple of applications Ive seen, read about or used is this, you can get an adjustable strut that can be removed, that mounts to where the shock would go. It can be adjusted 6 inches up or down. This was designed for a "crotch rocket" but with some slight mods you can make them work. If you want to make it a true rigid for good...you can do 2 things, cut the rear section off (where the seat would go) just before the battery box area, then weld a new tube from the down tube to the shock mount on the swing arm. Then shorten the "v" shape tubes to fit the new tube. This will make the bike rigid and tough.
The second option which is close to the first, is instead of welding, make tabs on the new tube that will simply bolt up to where the shock goes, making it kind of like a removable strut, but without the adjustment.

Recently I read where someone was looking for shorter shocks. If you are looking for shocks to fit a XS1100, I havent found any lowering shocks. However if you are ok with mild mods, Harley sells 6 inch lowering shocks, that can be installed on your bike. This will lower the back while retaining the comfort level.

I will continue on with the front end later.
Any questions or comments, feel free! I have a open mind and a lot of know how.
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Old 10-27-2012, 01:20 PM
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natemoen natemoen is offline
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Location: Fargo
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Welcome! Hope we all can help In any way we can.

I see you are new so I understand if you haven't spent much time here or read much of what is here.

You can get kits for the '78-'79 carbs. I do agree that often.there is no need to get a kit because other than the bowl gasket all parts can be cleaned and reused as long as they are not damaged, and yes you can easily and cheaply get individual jets. Just so that you and others know, the stock '79 special had 137.5 main jets stock NOT 140.

A bobber by no means has to be a rigid frame. In fact many bobbers retain suspention. The point of a bobber us just to remove all unnecessary parts in order to cut weight. Can a bobber be a rigid, yes, does it have to be, no.

As to shorter shocks, yes there are lots you could use, it is just that no one is going to advertise "XS1100 lowering shocks". You just need to think outside the box and find a shock shorter that 12.5" eye to eye that fits in the space available and can support the weight.
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1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters

Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner

In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

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Old 10-28-2012, 08:21 AM
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Aches n Pains Aches n Pains is offline
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Do shorter shocks have any impact on the alignment of the drive system?

Thanks,

Aches n Pains
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1995 KZ100P
Pods, jets, pipes, cam adjuster, oil cooler

1977 Ironhead - custom build
Hot engine, custom frame, KZ front and rear, high torque starter, alternator conversion, Progressive shocks, Thunderheart wiring, Dyna ignition, oil cooler, Dakota Digital instruments, etc.

Sold all my XS's to Eastcoaster but still love to keep up with you guys. This is the best cycle forum on the web.
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Old 10-28-2012, 08:52 AM
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natemoen natemoen is offline
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Quote:
Originally Posted by Aches n Pains View Post
Do shorter shocks have any impact on the alignment of the drive system?

Thanks,

Aches n Pains
Yeah. You don't want to high of an angle on the u-joint and you don't want to run it flat. You need some angle, but not to much.

Clear as mud?
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KD9ARL

μολὼν λαβέ

1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters

Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner

In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

Theodore Roosevelt
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