Get more than 55mph

[Sinnis Sucker]

So everyone i previously posted a query about the electrical problems on my bike, its all sorted now and havent had to have it back at the garage just yet (touch wood).

Anyways i was wondering if theres anything i can do to my apache smr to make it faster as its only going 55mph on a flat road......
Is there any restrictors on the bike like on other bikes...... If anyone could suggest a few things becuase going through the estate its fast but as soon as i hit them a roads i look a clown going 50 mph an hour most times......

[MarJay]

Doubt it. Four strokes are often not restricted. Even bikes which make the maximum allowable power under the learner law can go faster than 55mph, which points toward the bike not being restricted. My GF's first bike was a Derbi, and that had a maximum speed of 55mph too.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[Teflon-Mike]

Speed limit on most A-roads IS 50mph... whats your problem?

But, no, it's not 'artificially restricted' like an old two-stroke; it's just 'naturally' slow. Live with it; enjoy the fuel-economy; OR get a different bike.

You 'could' tune it, but its a 125, and in the greater scheme, they are ALL 'slow'. The 'fastest' of the fast 2T spurts 125's only ever achieved a gnats over 100mph... about as slow as a 40 year old Honda 250 single... so what do you expect/hope for, really? The best you might hope for is around the 12bhp/60mph mark, the factories achieved 40odd year back, without any modicum of reliability, so you aren't even starting with... so no realistic hopes there either I'm afraid.... so back to getting another bike.
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[WreckTangle]

yeah, it's the same speed as my crappy yamaha ybr 125. So to get it over 55 mph you will have to find a really straight piece of road with no traffic on it, and give it a full throttle burst for about.......5 mins....

eventually if you are luck it might hit 70 like mine did, but the noice it will make will be biblical, and it will probably be very unstable at high speeds.

One thing I notice that will affect the thing is wind resistance, if you are sitting up straight your torso will be creating alot of drag, so if so
push your body forward and kinda go into a forward crouching position

Like this:

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTlqdg2MfNm1_G-82pHsfN3FhkJXuxzEAWhmkbcsKV7raMhtZPpQw&s

your drag will go down alot, and you will find the bike goes a tad faster. Not much, but an extra 10 mph makes big deal when you are in a hurry
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[The Shaggy D.A.]

How big are you? I'm a fat git and my YBRs would sit at 55 happily, with the Custom a few mph slower than the standard which topped out at 68 on the GPS.
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[ThatDippyTwat]

130KG (presumably dry) and what, 10BHP max? 65 is the max indicated for that bike, even if you redline it in every gear. 4T GS/GN/GZ based motors are really sensitive to back pressure, so if someone has "Tuned" by putting some big old exhaust on it, put a stock on on it, you may regain the 10MPH you're missing. Same goes for the airbox. By all accounts the 15BHP motor from the Hyosung Cruise 2 is a fairly easy conversion to drop in, being a single based on similar GS/GN/GZ cases. Never tried it myself, YMMV.

[Fisty]

[WreckTangle]

[Teflon-Mike]

[ThatDippyTwat]

[chris_hu_cheng]

Could be a revs thing.

I have picked up an older Herald classic 125 (Chinese based of course), has the 18inch rear wheel and easy to get over 60 but need to rev it.

Can thrash it to over 50 in 3rd and then mid 60s in 4th, 5th however is just for maintaining mid 60s with less revs on a good road. Try changing up to 5th at 50mph and it bogs down and barely accelerates at all, same if you change up to 4th too early.

An extra 10mph makes a BIG difference on some journeys where the typical speed limit is 60mph (NOT 50). Getting there a bit quicker helps too.

So on that bike 5th is just for cutting the revs a little once you get up to top speed on a flat road. I suppose in theory 5th would take 75mph or more but there is not enough power to overcome resistance, over 70 is possible down a steep hill.

EDIT: dodgy wiring/cheap bulbs and or rectifier may pop bulbs, at the rev limits on Chinese bikes I went through two headlight and sidelight bulbs until I replaced and re-wired the headlight.

[MarJay]

So from what I can see, this is a perfect example of Tef posting total nonsense.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[WD Forte]

If you're tall and lets say 'pleasantly plump'
the bikes limited power will struggle to combat the air resistance
which increases with speed.
Top speed of an smr is stated to be 65 mph but they may have had a skinny yoof on it doing that with the wind behind him.

As its new you could always take it back and complain
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[Fisty]

[stevo as b4]

He's actually been more accurate in the past, but the advice and statistics change every time he talks about the same subject.

There have been Chinese 125cc air cooled four stroke clone engined bikes with as little as 8 and 9 claimed bhp. These will not depending on the bike be able to attain more than 50-55mph. The bit about them being made on old worn out Japanese tooling that can't produce the original cam lobe profiles I find dubious.

But some of the locally produced clone engines are designed to run on far worse crap octane fuel, so detuning, different ignition timing and lower compression are all possible.

Things have changed since Euro4 if not before, and the simple air cooled carb fed engines are extinct. Also the Chinese have got alot better at small engines, some of their 125 liquid cooled motors are now 12,13bhp and that's as much as 5bhp more than the early models.

[Bhud]

Is it really cost-effective or time-effective to look into ways of making it go faster? Personally, I doubt it. I know it can be hair-raising on some A-roads (moreso at rush hour) on a 125 sometimes. You've got a few options. Probably the best ones are, learn to live with it, or get a faster bike. If you're stuck on a 125, be patient and save your money for lessons and tests. Put £n away (a fixed amount) every month in a special account you won't touch until the time comes to either take your test or get a new bike. You will have more than enough. Until then, just steel yourself and go at your best pace, or give yourself more time for your journey and choose minor roads. Minor roads will make your journeys more interesting and memorable.

[wr6133]

[garth]

I've got a Sinnis with the same engine as the Apache.

I bought a big bore kit (150cc, £36) a high lift cam (£30) went up a couple on the main jet (£3) and fitted a +1 front sprocket (£8) and a cheapo k&n, ditched the airbox. Still on a standard exhaust.

It will now indicate 80mph downhill which is a GPS just over 70mph.

More importantly, it has a decent amount more low end.
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[Polarbear]

Another for the 'why waste time and money' approach.

Use it until you pass your test, sell it and buy a bigger bike. The old adage that 'there is no substitute for CC's' is a pretty fair one.

Also, when you come to sell it it will be worth (slightly) more unadulterated.
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Triumph Trophy Launch Edition

[Easy-X]

I sympathise. My old Superlight was listed as having a top speed of 65 but I rarely got it over 60; the engine wasn't up to it, the handling wasn't up to it. Most of the time I cruised at 45 ~ 50 which it seemed happier with. I'll always have a soft spot for it though and I did wonder what it would have been like to drop a 250 in from a Pakistani Superlight...

No, much better to have a "proper" bike
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[Kentol750]

Flounced by a teffing!
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Some bikes.

[andyscooter]

its a low powered Chinese 125 about 10bhp at most its all its got

you want more speed buy a 14bhp bike
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[lilredmachine]