XS1100H Build Stage II

[Outlaw4shrt]

So I posted my bike for sale a few weeks ago with zero interest. I put so much time and energy into this bike I've decided to see if I can take it a step farther, even sold another bike to do it.

Stage II is motor work and frame restoration. I've decided to go for the seemingly unobtainable 100rwhp figure and really clean up the look of the bike in the progress. I pulled the motor this weekend and I'm going to take it to Joe at DWMS Racing in Alabama. I've tried to do as much research as I can on the forum, I've read as many of Dan's post relevant to the issue as I could find, and have come up with the following build sheet for the motor:

- 1981 XS1100H motor with ~40,000 miles
- my stock carbs with the dyno jet kit and pod filters
- stock '81 heads with '78 camshafts
- deck head by .016"
- very minor port matching of the intake and exhaust ports, no polishing of the intake, careful polishing of the exhaust ports, and light polishing around the valve seats and guides
- Japanese 1196 kit (I tried to order both the Wiseco 1179 and 1196 kits but they are no longer in production)
- '78 mechanical/vacuum advance parts? (Not sure what these are or how to get them)
- has already been converted to chain drive

Any thoughts or recommendations as to what else I could do. I decided not to go with mega cycle cams out of preference. Any other little tricks or things to be thinking about aside from power adders? Thanks a lot.

- Adrian

And no post would be good without pictures so...

Stock


Stage I


Engine pull

[Fix]

I've never gotten any work from Joe, but he certainly seems to know his stuff. He's quite active on the vintage cafe bike board I'm on.

Looking forward to seeing your progress.

[natemoen]

Nitrous will get you there quick!

You can still get the wiseco kits, just gotta search ebay for them. Your looking at $450-$600 though for them, but it is high quality.

[jwhughes3]

James England has experience with NO2 on an XS11...PM him (or he may see this).


Guess you can ignore my sales advice!

Have fun and post dyno and video afterwards.

John

[Outlaw4shrt]

James England has experience with NO2 on an XS11...PM him (or he may see this).


Guess you can ignore my sales advice!

Have fun and post dyno and video afterwards.

John

haha, didn't ignore your sales advice, just didn't see it till now. I wanted to keep the bike anyway, Household 6 wanted to see movement on the number of bikes in the garage so I put the XS and my R6 up for sale at the same time and the R6 sold first. Wife was happy, even let me take the money from the sale of the R6 to put toward the XS so here we are.

Not really interested in nitrous. I see stories quite often of people putting 100,000 or even 200,000 miles on their bikes and I would like to keep the bike a daily driver and hopefuly do the same. I'd like to get the 100rwhp number and I hope I can creep up on it with already having done the chain drive conversion but if I don't get it, I don't get.

I would like to know if anyone has any exerience with valve jobs on these bikes. Anyone tried or seen any effects positive or negative from applying a 3 or a 5 angle valve job to the valves. I did a search and didn't get any real results.

Also, I've read over many of Dan's posts and he seems to advocate just using the stock carbs with the dynojet kit. Any real benefit from trying the ZRX 1200 carbs in this application?

[jwhughes3]

Not the valve grinding, but saw posts on exhaust porting and that was helpful. Not sure if that was in Bob Jones book or on the site.

Intake porting too involved, but mild polishing cannot hurt.

John

[Cobia]

Adrian,
Nice ride. You apparently have the chain conversion kit and an extended swingarm on your bike. Looks good with that longer swingarm. Yet, I don't know if you'll even notice the difference when you achieve 100 RWHP. These engines produce 95hp in stock configuration, granted, maybe 10% to 15% is lost via the shaft, but you're running a chain which probably cuts that loss in half. So, if you're already getting about 90+rwhp now, I don't thing your pursuit of 100rwhp will be that noticeable vs. all the work and expense it's going to take. JMHO. Good luck to you.

[natemoen]

Only the '78 had the 95 HP engine. The 79 started getting detuned for emissions and it just kept getting worse each year.

Even the '78 though probably only had mid to high 70rwhp.

[Outlaw4shrt]

Did some more research and I went ahead and ordered a set of 2004 ZRX 1200 carbs. Guess I'll hold onto the stock ones in case there are any issues with the ZRX carbs. I'm changing a lot of things at once but hopefully it won't be too difficult to troubleshoot any gremlins if there are any. Definitely getting excited about the build, should be taking the motor down to Joe today!

[Shacknasty]

Not the valve grinding, but saw posts on exhaust porting and that was helpful. Not sure if that was in Bob Jones book or on the site.

Intake porting too involved, but mild polishing cannot hurt.

John

I have never done any flow porting myself, but I stayed at Holiday Inn once! Actually I had a friend with a flowbench that did a lot of porting. He always said that intakes should not be polished. He said that the rough, grainy surface helps the fuel to remain atomized in the A/F charge. Smoothly polished walls would cause the fuel to condense on the sides and pool in the bottom.

He did say that well polished exhaust ports help the gas exit smoothly.

[jwhughes3]

John - by mild "polishing" I meant running some 300 grit sandpaper in there - guess I wasn't specific -

Sandpaper crosshatching is enough irregularity to encourage the fuel evaporation - though that is such a small difference as to be negligible in real world driving conditions.

Increasing the port diameter characteristics are a no no without a flow bench - but opening up exhaust can always be compensated for later with tuning.

John

[Shacknasty]

Thanks for clearing that up. What little I know is just from watching and asking questions. BTW, my buddy said that XS11 has good flow from the factory, just needed a tiny bit removed at the bottom of the intake to achieve the best flow.

[Outlaw4shrt]

Joe started the build yesterday! You can also follow the build here: http://www.dwmsracing.com/forum/inde...pic,929.0.html

Pictures:

[jwhughes3]

Adrian the good thing about a build like this is getting all that old carbon cleaned out.

You will feel better knowing its like new again inside.

John

[WMarshy]

Nitrous will get you there quick!

You can still get the wiseco kits, just gotta search ebay for them. Your looking at $450-$600 though for them, but it is high quality.

Your right, they can still be found on ebay but are $750 for a full set. Thats why I decided to buy a cheap cast set for $150. You have a good list going but you might want to visit the posts from Dan Hodges. He gave recommendations on what cam set up to use and also advancing valve timing using the 78 cams. If you still want to consider a more aggressive cam then check out Web Cams. When you get to flow benching the heads, I would appreciate it if you could post the stock flow numbers and as left. I have plans to do internal engine work too but put port/polish last on the list. Cams will come before port/polish... keep us posted!