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  #1  
Old 10-14-2010, 11:38 AM
ironhorse110ci ironhorse110ci is offline
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Hi, I am considering buying a UC with a Jim's 120ci Diamond cut fine motor. I've read some posts that said they had trouble with lifters/cam and front motor mounts. I asked the guy about it and he said he'd also had trouble and Jim replaced it. I'm definately familiar with the 110ci, but is the 120 a Harley motor or an S&S? I love the 6 spd tranny.

Thanks for any insight!
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Old 10-14-2010, 12:53 PM
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grbrown grbrown is offline
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Welcome to HDF from the UK. Harley and JIMS have come to some sort of arrangement where JIMS are the only engine builder allowed to make replacement engines to fit recent Harleys. See their website here. Neither Harley nor S&S make a 120ci.
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Old 10-14-2010, 02:59 PM
ironhorse110ci ironhorse110ci is offline
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Thank Graham for the welcome! So since it's neither Harley or S&S, I wonder how dependable the engines are. A guy in the classifieds has an 05 UC with 35,000 miles. Something with that much HP is great but wonder about durability.

Thanks for the help!
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Old 10-14-2010, 04:49 PM
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It's a pleasure! It is possible that mileage is for the bike, but the engine was fitted later and has fewer miles on it. I'm not sure how long they have been available and it seems unlikely someone would buy a new bike and have a new 120 engine fitted before riding it away. As for durability, hopefully they are built with stronger parts than a stock Harley motor!
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Old 10-14-2010, 07:17 PM
ironhorse110ci ironhorse110ci is offline
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He said he ordered it in 05 at the dealership. Then he said he ran it hard and they had lifter/cam problems that year which ruined his and Jim gave him another. So the miles may be off 1-2k miles. So it sure would be nice to know how dependable it is. It is loaded with 35,000 miles and looks showroom and the guy wants the pay off of $10,000.
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Old 10-14-2010, 07:41 PM
Biggzed Biggzed is offline
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JIMS motors have beefier cases than stock HD cases. The reliability is going to come from how hard it was ridden, how well it was tuned, how much regular maintenance was done to it. If it was ridden somewhat responsibly (ie, minimal burnouts, wheelies, hole shots, etc) and was ran in a good state of tune with regular maintenance then I would say you should be fine. If not, then all bets off as with any engine. The JIMS 120's were not hp monsters although there is a lot of untapped potential in them. A cam swap and some head work can turn them into real rippers.

Good luck on whatever you decide.

Zach
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Old 10-14-2010, 08:52 PM
ironhorse110ci ironhorse110ci is offline
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Thanks for the info Zach. You have a great point and that is how it was ridden and maintained. The scary part is he said he dragged it when he first got it but took it easy when he got the new motor.

The price is $5k less than kbb, but maybe it would be smart to wait for one that's slower, low mileage and babied.

Thanks man!
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Old 10-14-2010, 09:51 PM
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itsaw0rkinpr0gre$$ itsaw0rkinpr0gre$$ is offline
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Quote:
Originally Posted by grbrown View Post
Neither Harley nor S&S make a 120ci.
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  #9  
Old 10-15-2010, 02:53 AM
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Quote:
Originally Posted by ironhorse110ci View Post
Thanks for the info Zach. You have a great point and that is how it was ridden and maintained. The scary part is he said he dragged it when he first got it but took it easy when he got the new motor.

The price is $5k less than kbb, but maybe it would be smart to wait for one that's slower, low mileage and babied.

Thanks man!
Seems the durability of that motor has been partly proved! While the first one needed replacement the current one has lasted as well as a stock motor so far. If the bike is below book I have to say it sounds very tempting. Post pics when you get it!

Deuces R Wild, I guess I should have said Harley didn't make a 120 until very recently!
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1990 Officially 'Hyacinth' Blue FLHS/2008 S&S V107T, 2007 Buttercup XB12R, 2011 Merlot XL883L, MG ZT V8 281cid.
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Old 10-15-2010, 02:53 AM
 
 
 
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120, 120ci, ci, custombuilt, cvo, davidson, engine, harley, harleydavidson, motor, reviews, sale, slow, ss, turns


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