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Old 03-19-2013, 01:40 PM   #1 (permalink)
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Big bore break in

Just completed a big bore upgrade from 88 to 95" on my 2004 Fatboy. I didn't buy a kit with instructions, instead I bought pistons and had the jugs bored to size. Is there a standard break-in process for this kind of mod or a link to a site?
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Old 03-19-2013, 02:03 PM   #2 (permalink)
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do some heat cycles, you going to have it tuned on a dyno?
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Old 03-19-2013, 02:18 PM   #3 (permalink)
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I am no expert by any means, but I read a lot. I saw this post a long time ago and thought it was interesting reading: http://mototuneusa.com/break_in_secrets.htm You might find it helpful.
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Old 03-19-2013, 02:51 PM   #4 (permalink)
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Ride it like you stole it.
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Old 03-19-2013, 02:57 PM   #5 (permalink)
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i foung this on-line from a racer mechanic. the first 20 miles is critical. you want to
full throttle from 20 mph to 55 or 60 then let off the gas & let the bike slow its-self down to 20 mph. no brakeing. do this at least 20 times then vary your speed to cool the bike off.
what you want is to sling the rings against the cylinder walls several times. in order to
break them in.
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Old 03-19-2013, 04:39 PM   #6 (permalink)
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Quote:
Originally Posted by brownfoxx1 View Post
i foung this on-line from a racer mechanic. the first 20 miles is critical. you want to
full throttle from 20 mph to 55 or 60 then let off the gas & let the bike slow its-self down to 20 mph. no brakeing. do this at least 20 times then vary your speed to cool the bike off.
what you want is to sling the rings against the cylinder walls several times. in order to
break them in.
Its more like the first mile.
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Old 03-19-2013, 07:54 PM   #7 (permalink)
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NOOOOOO!!! Why does this Motoman Sheet continue to get posted here????? Really??? A HD AIR COOLED Twin Cam motor with iron cylinder liners has its own expansion rates and is NOT the same as the water-cooled engines that Moto Man (Egads!) posted. I wouldn't let that POS break in my air-cooled B&S lawn mower!! Please, please, don't do it his way on your Harley engine!!!

S&S knows knows more THAN ANYBODY on how to break in an air-cooled TC motor. Please consider the previous posts with extreme caution and please read the following link before you make a decision.

http://community.jpcycles.com/articl...-break-in.aspx

Thanks,

Tutt
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Last edited by CowboyTutt; 03-19-2013 at 07:59 PM.
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Old 03-19-2013, 09:59 PM   #8 (permalink)
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Quote:
Originally Posted by brownfoxx1 View Post
i foung this on-line from a racer mechanic. the first 20 miles is critical. you want to
full throttle from 20 mph to 55 or 60 then let off the gas & let the bike slow its-self down to 20 mph. no brakeing. do this at least 20 times then vary your speed to cool the bike off.
what you want is to sling the rings against the cylinder walls several times. in order to
break them in.
yep, but replace the mph with 3k to 4k and back to 3k rpm. do it in third gear and dont let motor ping or lug. yep, first mile is critical. have done every motor i built that way and no loss of oil conrol and no remarkable leakdown.
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Old 03-20-2013, 05:27 AM   #9 (permalink)
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Don't know about doing a dyno run til after a break-in. THe S&S instructions seem like a really good guideline. Thanks for all the replies.
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Old 03-20-2013, 09:21 AM   #10 (permalink)
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Riding the bike too lean, or too rich can do a lot of damage.
If it's fuel injected, do the heat cycles per S&S, then get it to a tuner and let them break it in on the dyno with the correct AFR.
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Old 03-20-2013, 11:38 AM   #11 (permalink)
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Back in the day that Dynos were not av to the average rider / shade tree mech.
When ready to fire up a new build, first made sure of oil flow
2nd after the bike fired you would richen up the mixture until you would see a hint of black smoke if you snapped the throttle off idle then adjust to it just cleared up.
Then adjust the idle and adjust mixture again to confirm
Then run the bike up to temp varying the RPM, shut it down and let it cool to ambient Temp
Run through that cycle about 4 or 5 times, change the oil after about 50 miles than again 250 and 500
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Old 03-20-2013, 02:37 PM   #12 (permalink)
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Quote:
Originally Posted by CowboyTutt View Post
NOOOOOO!!! Why does this Motoman Sheet continue to get posted here????? Really??? A HD AIR COOLED Twin Cam motor with iron cylinder liners has its own expansion rates and is NOT the same as the water-cooled engines that Moto Man (Egads!) posted. I wouldn't let that POS break in my air-cooled B&S lawn mower!! Please, please, don't do it his way on your Harley engine!!!

S&S knows knows more THAN ANYBODY on how to break in an air-cooled TC motor. Please consider the previous posts with extreme caution and please read the following link before you make a decision.

http://community.jpcycles.com/articl...-break-in.aspx

Thanks,

Tutt
I posted it because I thought it was relevant. I think it still is a**hole. If you read it, it says it's for air cooled engines too. It might not be the perfect way to break in a motor, but he shows results for his method. Who else does? I'm not saying this is the right method, but not saying it's wrong either. I used his method on my Lowrider and am not burning any excessive oil at 30,000 miles. To each there own, but I don't see how posting the link is so bad. I am familiar with breaking in aircraft engines (air cooled), and most I've talked to say break them in hard. Anyhow, I thought you might find that article interesting reading even though I offended one a**hole.
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Old 03-20-2013, 04:55 PM   #13 (permalink)
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Big Bore break in

Quote:
Originally Posted by stevedak View Post
Just completed a big bore upgrade from 88 to 95" on my 2004 Fatboy. I didn't buy a kit with instructions, instead I bought pistons and had the jugs bored to size. Is there a standard break-in process for this kind of mod or a link to a site?
Is a 95 considered a big bore now days? perhaps I've missed something

BD
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Old 03-20-2013, 06:23 PM   #14 (permalink)
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Quote:
Originally Posted by Bad Disposition View Post
Is a 95 considered a big bore now days? perhaps I've missed something

BD
Yes, I believe it is when you consider starting bore and stroke!
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Old 03-20-2013, 06:50 PM   #15 (permalink)
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Quote:
Originally Posted by Bad Disposition View Post
Is a 95 considered a big bore now days? perhaps I've missed something

BD
I have a 97" that started life as a 88" you figure it out
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