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Old 03-15-2014, 12:52 AM   #1
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Default OS speed R2101

Hi guys,
I have a question regarding the above mentioned engine.
I got this engine from a friend of mine. He bought it last year in Japan during the World's.
It should be an engine which was made for the japanese teamdrivers.
See also art. picture...
Can someone tel me if it is a special modified or same then the standard one?
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OS speed R2101-imag0562.jpg  
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Old 03-15-2014, 06:51 AM   #2
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Quote:
Originally Posted by supacha View Post
Hi guys,
I have a question regarding the above mentioned engine.
I got this engine from a friend of mine. He bought it last year in Japan during the World's.
It should be an engine which was made for the japanese teamdrivers.
See also art. picture...
Can someone tel me if it is a special modified or same then the standard one?
The OS 2101 was quite readily available during the Worlds in Japan last year.
Unless your friend got it from the team driver, maybe it is special.
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Old 03-15-2014, 07:38 AM   #3
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No he got it from a Futaba shop. But they told him it was the pre engine for the teamdrivers.
I know that for example Novarossi mark them with a red dot on the rear side screw.
Can't see anything on my engine.
I am just asking because I am interested.
I will see after breaking in :-)
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Old 03-15-2014, 11:11 AM   #4
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Quote:
Originally Posted by supacha View Post
No he got it from a Futaba shop. But they told him it was the pre engine for the teamdrivers.
I know that for example Novarossi mark them with a red dot on the rear side screw.
Can't see anything on my engine.
I am just asking because I am interested.
I will see after breaking in :-)
It's a standard..

I don't know if the team drivers like Hara and Shimo are running 'team' R2101s but the only special OS R2101 I saw was the Maxima R2101 on Gilles' and maybe a few more other drivers.
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Old 03-15-2014, 12:45 PM   #5
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Isn't it just a replica?

Mostly manufacturers do produce a WC replica engine because people ask for it.
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Old 03-16-2014, 01:12 AM   #6
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Originally Posted by Roelof View Post
Isn't it just a replica?

Mostly manufacturers do produce a WC replica engine because people ask for it.
The Maxima version? A fair bit of work was put into it from what I saw
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Old 03-17-2014, 02:29 PM   #7
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Hi ,

On the engine if you see letters WC2013 and the number for the engine then it was for team driver .

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Old 03-18-2014, 06:51 AM   #8
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Ok. It is a normal engine then.
There is no number on the crankcase, only the letters RH on the mounting flange.

How is your experience between the OS and the Novarossi 35 plus QC?
Which one is for technical narrow tracks better?
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Old 03-18-2014, 09:22 AM   #9
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Quote:
Originally Posted by supacha View Post
Ok. It is a normal engine then.
There is no number on the crankcase, only the letters RH on the mounting flange.

How is your experience between the OS and the Novarossi 35 plus QC?
Which one is for technical narrow tracks better?
OS provide better torque than 35 plus
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Old 04-21-2014, 12:27 PM   #10
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Those who have tried them here in the UK have said they have a lot of torque and need gearing higher than other motors, the fact it produces it's peak power 8000rpm lower than a Novarossi probably has something to do with this.

We have a few drivers in the UK running them, be interesting to see how they go!
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Old 08-13-2014, 04:49 AM   #11
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In Japan, it has a limited edition of 200 sets. With matched piston set,....with pipe.
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Old 08-31-2014, 08:33 AM   #12
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Angry main bearing failure

Hi guys,
Here a quick feedback and hopefully replys on how to do now...

After breaking in the engine with the heatcycle method (about three liter) I joined this weekend our club race.
After finetuning the engine went really well, couldn't even use the power on many parts of the track..
Highest measured temp was 116℃. Adjusted to 100 to 105℃ afterwards.
Ambient temperature was 27℃.

After the first main the engine lost dramatically on power and died several times...
Tod I disassembled everything and found this:
Piston/sleeve have several fine scratches (mainly on the intake side)
Main bearing has about 0.1 to 0.2mm radial gap and about 0.1 mm axial gap - it sounds now like a music instrument
Conrod has on the rearside also scratches
The crankcase has deeper scratches on the bottom side - comes from the crankshaft


I guess it is a bearing failure. The crankshaft created metal shavings from the crankcase and they came to the piston/sleeve.
Do you guys think it is useful to contact OS for this?
PS: airfilter was brand new and temperature gun was an exergen...
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Last edited by supacha; 08-31-2014 at 08:39 AM. Reason: add more details
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Old 08-31-2014, 08:54 AM   #13
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here is a picture of the crankcase.

You can see the touching area which comes from the crankshaft on the bottom right next to the groove for the conrod.

I can press the crankshaft easily by hand against the crankcase - with mounted bearings....
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Old 08-31-2014, 08:59 AM   #14
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picture
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Old 08-31-2014, 11:15 AM   #15
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It wouldn't hurt to send the report into OS and see what they say. What fuel were you running as it look like there is some corrosion on the bearing outer race??
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