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MikeKP61 |
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MikeKP61 Two Stroke Sniffer
Joined: 19 Sep 2016 Karma :
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stirlinggaz |
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stirlinggaz World Chat Champion
Joined: 22 Jul 2007 Karma :
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Posted: 10:38 - 08 Nov 2017 Post subject: |
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Hi,
138/42/65 are the recommended jets for full power jc22.
I have 2 & both are pretty gutless below 3500rpm, I'm sorry that doesn't help much, but 2t's like the nsr arn't designed to be rode around at such low revs, ride it like you stole it & forget about riding it below 4000rpm
cheers,
GAZ |
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MikeKP61 |
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MikeKP61 Two Stroke Sniffer
Joined: 19 Sep 2016 Karma :
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Posted: 10:55 - 08 Nov 2017 Post subject: |
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I wouldn't mind but it bogs down on roundabouts and corners at low speeds too, I don't want to shit the clutch letting it in at high revs |
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Tankie |
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Tankie Crazy Courier
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- Super Spammer
Joined: 22 Oct 2013 Karma :
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Tankie |
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Tankie Crazy Courier
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stirlinggaz |
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stirlinggaz World Chat Champion
Joined: 22 Jul 2007 Karma :
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Posted: 21:22 - 08 Nov 2017 Post subject: |
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Hi,
Its a characteristic of these "sports/race" type exhausts, to sacrifice power lower down in the revs, shifting the power band up a bit (& sometimes narrowing it) & increasing bhp to around 21kw @ 10500-11000rpm
Whereas the OEM exhaust (a 15kg lump of scrap metal imho) sacrifices power for usability at lower revs but tbh i can't recall EVER riding my nsr at below 5000rpm, except when setting off
Have a look at a dyno print for a jc22 fitted with a tyga, giannelli etc & you will see there's very little power to be had below 4000rpm, although some pipes are worse than others.(I prefer the jolly-moto)
A happy medium can be had by fitting a bigger carb
cheers,
GAZ |
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Tankie |
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Tankie Crazy Courier
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MikeKP61 |
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MikeKP61 Two Stroke Sniffer
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stirlinggaz |
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stirlinggaz World Chat Champion
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- Super Spammer
Joined: 22 Oct 2013 Karma :
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Posted: 11:19 - 09 Nov 2017 Post subject: |
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MikeKP61 wrote: | Enough power to move the bike from a stand still anyway, I'm well aware of what it is and I know it's not a bloody Hyabusa. If your solution is to throw hp figures around and talk like a know it all then you can keep it to yourself thanks. |
You DO NOT pull away on a 125 2 stroke at 2,000rpm. Who are you trying to kid? It would stall.
I posted the graph to show how an even more powerful 125 with a Tyga pipe only makes 4bhp at twice the revs you're talking of.
At 2,000rpm, in reality with a Tyga pipe, your bike is probably making less than 2bhp.
How long have you owned and ridden this NSR? I own one with an Arrow pipe, along with 3 X TZR250's and a TDR250 and would never expect any of them to drive from under 4,000rpm.
Looking at Tyga's website, they only list a pipe for the NSR150, not the 125. Is this pipe definitely for an NSR125?
https://tyga-performance.com/index.php?cPath=71_815_816 ____________________ TZR250 2MA road, TZR250 1KT road, TZR250 2MA race, TDR250, YZF-750R Boost colours.
Jaguar S Type 3.0 V6 Sport R, VW Transporter T5 GP LWB Shuttle 140ps DSG. |
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P. |
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P. Red Rocket
Joined: 14 Feb 2008 Karma :
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Posted: 12:30 - 09 Nov 2017 Post subject: |
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I'd never attempt to use 2k rpm for anything on a 2 stroke other than idle speed.
I never used to pull away on my RS under 5k, slipping the clutch to push those revs up. 2k is absurd
Even my KH125 which is a low tuned commuter 2 stroke was dancing at over 3k when pulling away. Use more revs. |
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alains |
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alains World Chat Champion
Joined: 08 Jul 2004 Karma :
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Posted: 14:41 - 09 Nov 2017 Post subject: |
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i said many times before BOYSEN reeds are not well adapted for the NSR (too hard , only 2 petals) . the best make are the jollify 36/100 mm , cheap and long life
they can be purchase https://www.ebay.de/itm/JOllify-Carbon-Membrane-fur-Honda-NSR-125-R-036e/120762901399?hash=item1c1e07a397:g:r-gAAOSwZkJURggn
your jetting are OK , but you may have a problem with your choke
the choke piston has a concave rubber underneath which close the hole . if for any reason it doesnt close properly when you adjust the pilot screw it's possible you unscrew at the end
if the spring is worn , cable with sharp bends , choke body durty you will have the same bugs
good luck ____________________ the worst day fishing is better than the best day working |
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MikeKP61 |
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MikeKP61 Two Stroke Sniffer
Joined: 19 Sep 2016 Karma :
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Posted: 04:45 - 10 Nov 2017 Post subject: |
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I'm not trying to "kid" anyone, I'm asking a question and looking for a solution (something you haven't given). If you read what I said I mentioned it also bogs down on roundabouts and slow corners also, I'm looking for a fix to bogging down at low revs. I have NEVER ridden a 2 stroke bike before this oh holy 2 stroke master if you must know, I just like the idea of them so I picked up one in a shite state and rebuilt it to have something to mess about on. Have to start somewhere and all that, maybe in a couple of decades I'll be as pig headed as you
The exhaust is for the 150SP but I was talking to the guys at Tyga and they said it should run fine on the 125 with a few mods like up jetting.
I'll have a look at the choke Alains and look into them other reeds too, thank you for your help, I'll let you know how it works out! |
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P. |
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P. Red Rocket
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Tankie |
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Tankie Crazy Courier
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- Super Spammer
Joined: 22 Oct 2013 Karma :
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Posted: 11:09 - 10 Nov 2017 Post subject: |
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MikeKP61 wrote: | I'm not trying to "kid" anyone, I'm asking a question and looking for a solution (something you haven't given). If you read what I said I mentioned it also bogs down on roundabouts and slow corners also, |
You're in the wrong gear then, you should not be trying to drive a 2T at 2,000rpm on roundabouts. Go down a gear or two.
MikeKP61 wrote: | I'm looking for a fix to bogging down at low revs. I have NEVER ridden a 2 stroke bike before this oh holy 2 stroke master if you must know, I just like the idea of them so I picked up one in a shite state and rebuilt it to have something to mess about on. Have to start somewhere and all that, |
There's your problem. I've tried explaining it several times and showed you a graph to show power isn't even worth bothering about below 4,000rpm. You're just too pig headed to listen.
MikeKP61 wrote: | maybe in a couple of decades I'll be as pig headed as you |
Maybe in a couple of decades, you'll listen to advice from someone who's ridden, raced and owned many 2 strokes for decades?
MikeKP61 wrote: | The exhaust is for the 150SP but I was talking to the guys at Tyga and they said it should run fine on the 125 with a few mods like up jetting. |
Oh FFS, so I was right about that too. 2 stroke expansion chamber design is critical to each engine. It needs dynoing properly to try to set it up, it may be miles out for your engine and not work any better than standard. ____________________ TZR250 2MA road, TZR250 1KT road, TZR250 2MA race, TDR250, YZF-750R Boost colours.
Jaguar S Type 3.0 V6 Sport R, VW Transporter T5 GP LWB Shuttle 140ps DSG. |
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MikeKP61 |
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MikeKP61 Two Stroke Sniffer
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rhys99 |
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rhys99 Scooby Slapper
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MikeKP61 |
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MikeKP61 Two Stroke Sniffer
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- Super Spammer
Joined: 22 Oct 2013 Karma :
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Posted: 11:13 - 13 Nov 2017 Post subject: |
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MikeKP61 wrote: | You don't seem to understand, say when I'm coming on to a round about and I'm I'm second gear, when I throttle down up to the roundabout it's slows the engine grand, but when I open the throttle again at say 3k to 4K revs it bogs down. If pin the throttle opens ot I'll pick up again but it jolts into action like when you have a loose chain. If I was to just keep the throttle where I normally keep it, say on my Hornet (4 stroke I know sorry) it will just continue bogging and die. I wouldn't mind if keeping it at 5k revs the whole way around the round about in first was feesible but it's not how I'm used to riding. Is it a matter of Justin using it and figuring it out or can I adjust the carb to give a more even throttle change from idle to cruise? |
If you're not prepared to listen to the many people who know the subject and have tried to help, don't bother posting more ignorant crap like this please.
It's a 2 stroke 125 which you've fitted with an expansion chamber designed for a 150cc model, without bothering to get it dyno's to even see if it remotely works with your port timing, carb size or jetting. Stop trying to ride it like a 600cc 4 pot 4 stroke. ____________________ TZR250 2MA road, TZR250 1KT road, TZR250 2MA race, TDR250, YZF-750R Boost colours.
Jaguar S Type 3.0 V6 Sport R, VW Transporter T5 GP LWB Shuttle 140ps DSG. |
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P. Red Rocket
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alains |
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alains World Chat Champion
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P. |
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P. Red Rocket
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- Super Spammer
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Old Thread Alert!
The last post was made 6 years, 164 days ago. Instead of replying here, would creating a new thread be more useful? |
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