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Old 12-13-2011, 05:17 AM   #136
Reposado1800
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That carb set up looks waaaay too complicated. Wouldn't it be easier to build a new manifold and run a single pumper carb? It might take some foundry work to cast it out of aluminum, but hey?
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Old 12-15-2011, 03:22 PM   #137
Wattner OP
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Originally Posted by therealbigman View Post
Yall taking applications.
You may laugh, but I may need a few ultra quality foremen/laborers to work through the winter in Key West. Drug-free or don'y even consider it.... If negotiations go as planned, we will begin in January

PM for details....
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Old 12-15-2011, 03:52 PM   #138
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Originally Posted by Wattner View Post
You may laugh, but I may need a few ultra quality foremen/laborers to work through the winter in Key West. Drug-free or don'y even consider it.... If negotiations go as planned, we will begin in January

PM for details....
I would consider it Wattner , drug free , yes , foreman / managerial material , yes ,

Climbing Ladders ......................... SORRY , I'm Skeered of hights.
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Old 12-16-2011, 07:13 AM   #139
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Originally Posted by therealbigman View Post
I would consider it Wattner , drug free , yes , foreman / managerial material , yes ,

Climbing Ladders ......................... SORRY , I'm Skeered of hights.
No ladders required, but it is a fairly tall building for Key West... Need to replace floors and make various repairs
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Old 01-28-2012, 07:06 PM   #140
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Originally Posted by cyclewizard View Post
yep sure do I live by Frankenmuth Mi.

Is your shop on Dixie Highway?
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Old 03-14-2012, 07:29 PM   #141
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For the 724/742/750/760/780 motors.
To get the true potential of one of these motors you need at the very least a 45mm carb, I run a 48mm on mine.
If I could get a 52mm carb that would be even better.
The stock carb will work fine but it won't make the power one would expect to have, it's like trying to suck through a straw...same for the FCR41 and Mikuni HSR42..not big enough.
The stock exhaust will work fine also but the same principles apply here too(blow through a straw).
Same for a cam, a huge slug like this will make an evil cam in a 650cc motor a tame mild whimpy cam in a724/742/ 750/760/780motor.
Now things change a lot if you if you go with a 86mm stroker crank and a 102mm piston which would be a 703cc motor or called a XR700.......

With the 102 bore/86mm stroke and a comp height of 29.01mm/132mm rod and a 58cc chamber will yield you a 11.1 motor


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Old 03-14-2012, 08:50 PM   #142
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Originally Posted by cyclewizard View Post
For the 724/742/750/760/780 motors.
To get the true potential of one of these motors you need at the very least a 45mm carb, I run a 48mm on mine.
If I could get a 52mm carb that would be even better.
The stock carb will work fine but it won't make the power one would expect to have, it's like trying to suck through a straw...same for the FCR41 and Mikuni HSR42..not big enough.
The stock exhaust will work fine also but the same principles apply here too(blow through a straw).
Same for a cam, a huge slug like this will make an evil cam in a 650cc motor a tame mild whimpy cam in a724/742/ 750/760/780motor.
Now things change a lot if you if you go with a 86mm stroker crank and a 102mm piston which would be a 703cc motor or called a XR700.......

With the 102 bore/86mm stroke and a comp height of 29.01mm/132mm rod and a 58cc chamber will yield you a 11.1 motor


CW..
Whoah. Are those built from 600R or 650R motors? What are these huge carbs you are running
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Old 03-15-2012, 09:43 AM   #143
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Originally Posted by XRx View Post
Whoah. Are those built from 600R or 650R motors? What are these huge carbs you are running
built from XRL650 and XXR 600 motors..

The carbs are bored FCR's or a 48mm HSR Mikuni......I like the FCR better..
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Old 03-02-2013, 02:02 PM   #144
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Bump.
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Old 03-03-2013, 09:59 AM   #145
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Good read, I wasn't aware my XL600 motor was the "hot setup" lol. Looking forward to running it with that new head on it!

I was posting in a thread on TT about lighter flywheel. Supposedly the xr500 the early XR600 have the lightest flywheels at a hair over 5lbs and make for a good mod to swap into something like my XL6. The main draw back I learned from having a lightened flywheel in a car is that they can stall easier and start harder. Any takes on that or what an ideal flywheel weight would be?
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Old 03-03-2013, 10:06 AM   #146
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I dont think you could go too light. These things have big heavy cranks anyway.
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Old 03-03-2013, 10:20 AM   #147
Carter Pewterschmidt
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Originally Posted by cyclewizard View Post
No problem, here's a few oiling mods that will help with cam and journal wear.
1...drill one size larger jet holes in your camshaft and then chamfer them with a bit three sizes larger than that, make sure you do the center cam bearing journal also.
2...you need to drill both the banjo bolts the same size...
3...enlarge and chamfer the side case oil feed holes so the oil can get upstairs to the head faster and smoother a larger line would be nice too but not necassary if synthetic10/40 is used, no 20/50 it's to thick on startup..
4...build a thicker oil pump rotor by at least .040...020 even helps alot here........this one you will need a good machinist to do this for you if your not one yourself...
5...add an oil squirter to the under side of the piston/crank assembly. another job for a smart guy..
6...steps 4 and 5 aren't that necessary for your average xr motor if you add ZDDP to your oil and use 10/40..
In this post you recommend running a 10/40 oil and a ZDDP additive. The brand of oil you can run I assume is pretty open, but what additive do you use and how much do you put in. From what I read for break in use it's like 4 oz to every three quarts of engine oil.
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Old 03-03-2013, 10:39 AM   #148
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bumpityy bump bump for the best thread and builder on here...

Im having an awesome time with my hrc BIG cam, hardened rockers and racing springs...

oh and with the faltslide and twin headers back on heeeeeeeeeeeeeeeeeeeeeeeeeyaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaah

thanks again CW

thankful member,

christian
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Old 04-10-2013, 03:48 PM   #149
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Xbr500

Hi cyclewizard
Any hints or tips for squeezing the most out of an xbr500 would be appreciated. Xl600 jug? Not sure? Bike has done 38k and has a bit of cam chain rattle so I figure a top end birthday with a .5 over standard wiesco kit and a cam grind and face rockers or hrc cam.( if I can find one) Unless I can be enlightened if it's as easy to run the xl600 barrel as many of the forums say. Have barrel on stand by. Any tips here please...600head or keep xbr. Are they the same? Decomp? Will fit a minkuni flat or similar pumper carb if 100.5mm is an easy swap. Exhausts? Length? Flared? 2 into one or twin?
Any info greatly appreciated.
Cheers Stu
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Old 09-05-2013, 09:41 PM   #150
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Wink Rfvc engine parts swap

G'day all
Was given an xbr500 or gb500 you might know better. Not the greatest of 2 wheel fun machines but all jokes aside, have been cleaned out by the ex and that was all I could afford at the time. Turns out there's a bit of a following and my last post was a bit hasty and written in a beer hazed stupor.
Reading through this entire thread has been enliteni g to say the least.
Hoping to get some contact details from you CW. looking to send a cam for a grind and purchase a piston kit to suit the oversized xl600 barrel.
Have sourced an XR600 bare motor and hoping to use the head of that to avoid the expense of a double carb set up. Swap a few parts such clutch baskets and flywheels and other upgrades. I know it not a race bike of crazy horsepower but I like em and the idea of a trick little commuter with a bit more grunt appeals. The Tengai is in the shed for off road and im itching for a project. Any advice appreciated...
Thanks
Stu
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