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OS R21 .21 1/8 On-road Motor

Old 08-29-2019, 11:08 AM
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Hi. I just got myself a brand new never run OS speed R21 Eurospec. The instruction sheet says its set for 25% nitro. Is anything required (Head shim change perhaps?) to run with 16% nitro?
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Old 08-29-2019, 11:30 AM
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Originally Posted by westonflyer View Post
Hi. I just got myself a brand new never run OS speed R21 Eurospec. The instruction sheet says its set for 25% nitro. Is anything required (Head shim change perhaps?) to run with 16% nitro?
On short tracks(and you want to squeeze all out of your engine) you can try without the copper shim(0.1mm) but in general I suggest you leave it as is.
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Old 08-29-2019, 11:52 AM
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Originally Posted by VS_Rody View Post
On short tracks(and you want to squeeze all out of your engine) you can try without the copper shim(0.1mm) but in general I suggest you leave it as is.
Thank you Rody. I think I will leave shims as set from factory then. Will be running on UK tracks so there are a mix of some fast longer tracks and some shorter more technical tracks.
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Old 09-02-2019, 01:05 PM
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New R2104
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Old 09-02-2019, 01:10 PM
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Originally Posted by RC MARKET View Post

New R2104
Different motor, and already has its own thread: OS R2104 engine Thread
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Old 08-14-2020, 02:13 PM
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When would you run 0.2mm gasket?
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Old 08-14-2020, 03:00 PM
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Originally Posted by tdu verney View Post
When would you run 0.2mm gasket?
On short and tight tracks which have a lot of grip.
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Old 09-13-2020, 10:41 PM
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Can you use on R2101 Piston and sleeve in Euro and R2103. Not sure if cranks or timing are different.
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Old 09-14-2020, 01:34 AM
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Originally Posted by invrtd View Post
Can you use on R2101 Piston and sleeve in Euro and R2103. Not sure if cranks or timing are different.
Yes, you can. Timing of the sleeves are the same, only exhaust shape is a little different.
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Old 09-14-2020, 08:08 AM
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Which one has more top end?
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Old 09-14-2020, 09:07 AM
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Originally Posted by invrtd View Post
Which one has more top end?
The Euro Spec engine.
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Old 09-29-2020, 03:42 PM
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I know most of you don't run GT but I do from time to time. In the US the R21 blue head is on sale. Has anyone used this in a GT? It's a 5 port so I think it meets IFMAR regulations.
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Old 09-30-2020, 02:23 AM
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Not used in a GT, do not own one but some club members do run it in an onroad, and it is a decent enging.

I did measure the timings and it is somewhere in between an offroad and an onroad so I think it will meet up with the needs of a GT but there is one thing, you probably want a larger head for a better cooling.
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Old 03-15-2021, 08:48 PM
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Scratch that!
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Old 03-15-2021, 10:06 PM
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Planning on running a Euro Spec , I will be running 25% what is needed to set the engine up for 25% & what is the best Hipex HD to use , home track is Steel City Raceway
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