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Thread: Rs4 50 2018 aftermarket exhaust and upgrades

  1. #46
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    Quote Originally Posted by THE BROWN NOTE View Post
    Cheers will give it a go

  2. #47
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    With any other mods is it possible to get the power consistant throughout the range.. rather than just top end cheers

  3. #48
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    Cool Resources

    Quote Originally Posted by Berkeley View Post
    With any other mods is it possible to get the power consistant throughout the range.. rather than just top end cheers
    Technically yes, but it's tricky. You can start with these:

    Jennings

    Bell

    When you really get advanced you can go here, well you actually don't even have to understand this one to enjoy it.

  4. #49
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    Fantastic cheers

  5. #50
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    Quote Originally Posted by THE BROWN NOTE View Post
    The online specs for a 2018 model says 11/53 however mine has an 11/59 ratio. Can you think of why? So is it better to still change to a 13 at the front? Or drop the rear to a 53.. or both? Thanks Click image for larger version. 

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    I still want good acceleration at the lower end but a little more give at top end so is the 13/59 the way to go?
    If there's a better setup then it I'm all ears thanks
    Last edited by Berkeley; 08-10-2018 at 10:34 AM.

  6. #51
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    13 / 53 is best.

    59T sprocket is used for restricting speed to 28 mph.

    Previous government law was 31 mph with 53T

  7. #52
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    Quote Originally Posted by THE BROWN NOTE View Post
    13 / 53 is best.

    59T sprocket is used for restricting speed to 28 mph.

    Previous government law was 31 mph with 53T
    Awesome.. I had a feeling it could be something to do with that.. great tip cheers

  8. #53
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    There are many different set ups for sprockets, and the combination is very dependent on how the engine is set up, and where you'll be riding the bike. I will change the gearing on my bike to some thing lower if I'm going to ride north, and higher if I'm going to ride south. Up north are more tight up hill corners, and I'll want more pull out of those corners. Down south we'll be on longer faster roads where I'll want more top speed.

    For my kitted bikes I've usually run a 14, or 15 up front. On the bike in Japan with the 2Fast 10cc kit I brought a 15, and 16. On the Silver bike which had a stock 50cc engine with the 17.5 stock carb, and a Jolly Moto pipe I run a 14 front sprocket with the stock 52 in the rear—the older GPRs had either a 52 for the 50cc bikes, or a 46 (could be different, I'm doing this from memory!) on the 75cc bikes. Most of the more recent GPR 50/RS50/RS4 50 bikes have come with a 53 in the rear.

    The 59 is one way they satisfied the government's policies. I would replace it. You have some options there, as you could get a steel 53, or look for an aluminum rear sprocket. These are much lighter, and since the newer wheels are so much heavier anything you can do to lighten things up is usually a boon.

    Here is the stock Derbi rear 53 tooth sprocket..

    Here is the Afam GPR rear sprocket available in 52 and 53.

    Here's the Doppler Red aluminum rear GPR sprocket. Even though they are red they aren't very attractive. If they were I would have already ordered a couple!

    You can also get custom sprockets from Sprocket Specialists.

    For the front sprocket you can use the same sprockets as a Honda Grom. You might have to change the mounting mechanism depending on the source. I usually switch my bikes to run an E-clip to hold the front sprocket. These are great as they make it quite easy to swap sprockets.


  9. #54
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    Derbi GPR Sprocket Specs

    Here is the information you'll need if you have a custom sprocket ordered.


  10. #55
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    Cheers guys really helpful!! It's all a mix here. Long straights.Lots of mountain's/ hills. Tight bends etc. Ill think I'll try a 13/53 To start. Also as mines a 11/59 So I guess just to take a few links out.. or is there anything different i should try for the chain. Btw my daughter loves it.. first time out on it this evening hit 75kmh.. now I'm back and she's staying out riding

    Click image for larger version. 

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  11. #56
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    Riding up to limone in italy today Click image for larger version. 

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  12. #57
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    Cool Always Wear Good and Proper Gear

    Looking good, but please get her some leather gear for her jacket, pants, gauntleted gloves, and some proper boots. Those shorty shoe things are fine for walking around on Halloween, but shouldn't ever be chosen for riding a bike—they just don't offer enough protection. These sorts of things are way more important than most of the stuff we've talked about in this thread—actually probably more important than anything else we've talked about in this thread.

  13. #58
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    Sure will do .. we went to get boots today before the trip but none fitted. Then after went to another store but closed. The bike isn't powerful enough to do anything stupid on it yet... unless you completely miss a bend.. And yes a car can always pull out etc but before next stage of improvements for sure as this I know we will be properly riding the bikes and not just coasting along like we are doing now..

    Honesty speaking and from experience you need to think how much skin you want to save vs the risk. If you go off a cliff you die. If you crash in full leathers you still break bones or die. If you wear shorts you have no skin... so risk management is all I say.
    Last edited by Berkeley; 08-11-2018 at 02:59 PM.

  14. #59
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    Attachment 364788
    Attachment 364789
    so stage 6 or polini?

  15. #60
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    Quote Originally Posted by Berkeley View Post
    Yeah nasty... Re top ends.. been reading a lot of your posts..still no clearer. Whats a good plug and play system? I see uve done many tweaks, trials and tests.
    Tonight fitted the tail tidy from evotech. Looks good.. need new number plate then good to go.
    Jm exhaust is coming Friday... Will be a busy night ahead!
    Attachment 364539

    Btw when i brought the bike the shop upgraded the indicators to the led ones that flash concecitavly like the Audi ones.. but for some reason they didn't work and the std blubs had to be fitted.. do you know of any reason
    Thanks
    Attachment 364540
    You were right.. I went into another shop and saw the led lights but next to it was a packet with the resistors.. so the shop where I brought it obviously didn't know

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