speedshite 100 reliability advice

P3TR0L H34D · Two Stroke Sniffer Joined: 02 May 2011 Karma :

Hi all, just a quick one really, I've just bought a speedshite 100 for cheap commuting through the better weather. The only thing that was on its way out was the clunky original exhaust, so I found a cheap tecnigas exhaust locally and have proceeded to fit it. Although I read a lot of talk about lighter rollers, stiffer clutch springs and upjetting 10%. I prefferably don't want to do any of this if not totally necessary really. So my question is will not doing any of these things make it more likely to pop/seize/break or just not perform at its peak. Really its only the upjetting I'm concerned about as this means that its now running lean, which is not ideal on a tiny air cooled engine under a lot of stress. Also just to make it clear I'm not some chav trying to trick out his speedfight to "race spec" or anything like that.

Thanks in advance gents
Paul
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First ever bike - 1980's Honda XL 250 (Offroad), 2004 KTM SX 125 Rattray Edition, 2004 Yamaha DT125RE, 2006 Husky WRE 125, Speedshite 100, Current- Car....... Sad

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

You need to upjet...it will need some form of fiddling anyway.

If you don't want the hassle, keep the exhaust stock.

TGB · Two Stroke Sniffer Joined: 08 Jun 2012 Karma :

any kind of tuning will have its pros and cons. its a case of understanding the balance of these pros and cons. if you are looking to use the bike as a daily rider i would leave it as is. alot of people want mega gains from their machines but rarely concider the concequencies of their actions should things go wrong. as when tuning you not only have to invest in the tuning it self you also have to invest in makeing it reliable so in essence we have to invest twice over to maintain the balance of power and reliability.

Nope. · World Chat Champion Joined: 17 Feb 2011 Karma :

The minimum you need to do is increase the jet size, otherwise you risk the engine running quite lean.
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Former: Derbi GP1 50, Sachs XTC 125, Suzuki GSXR 400 GK73A, Kawasaki ZX7R, Suzuki DR250, Yamaha RD350
Current: 2011 Yamaha XT660Z Ténéré, 2003 Yamaha YZR-R1 5PW (In Build), 2009 Kawasaki ZZR1400

P3TR0L H34D · Two Stroke Sniffer Joined: 02 May 2011 Karma :

That is what I suspected, I don't suppose you would know what size main jet is standard on the speedfight 100? Thanks

Paul
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First ever bike - 1980's Honda XL 250 (Offroad), 2004 KTM SX 125 Rattray Edition, 2004 Yamaha DT125RE, 2006 Husky WRE 125, Speedshite 100, Current- Car....... Sad

Blau Zedong · Banned Joined: 26 Jun 2006 Karma :

Nope. · World Chat Champion Joined: 17 Feb 2011 Karma :

P3TR0L H34D · Two Stroke Sniffer Joined: 02 May 2011 Karma :

Just had a look and its an 86 as standard in my 2007 speedfight, they say about a 10% increase, so do you think 94 sounds sensible or 96?

Paul
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First ever bike - 1980's Honda XL 250 (Offroad), 2004 KTM SX 125 Rattray Edition, 2004 Yamaha DT125RE, 2006 Husky WRE 125, Speedshite 100, Current- Car....... Sad

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

trial and error i'm afraid. time to do plug choping

SpannerMonkey · World Chat Champion Joined: 26 Aug 2010 Karma :

Hello my friend, Rollers will affect where your revs are sitting at effectively... a lot of the entry level technigas exhaust have a power-band between 7000-9500 RPM roughly. by NOT running in this RPM you will be throwing fresh fuel straight down your exhaust and not getting the power from it. for the few quid you pay for rollers, it's worth doing.

Stiffer springs just make it rev up a bit more before it takes off, increasing acceleration off the line.

Upjet is CRUCIAL. I once tried to get away with it on my old Aerox. Not a chance. not even a few hundred miles with a Leovince Handmade TT and the bike kept overheating. I thought the temp sensor was faulty so carried on riding. The bike inevitable siezed a short while after, ruining my crank and my shiny cylinder kit (That I did upjet for)

If you're just after a simple exhaust, get a Leovince touring exhaust from adrenalin pedstop if they have them in, No jetting changes or anything necessary and theyre a little cheaper
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My bike? A YX140 powered one-off Monkey Bike, something a little different!

P3TR0L H34D · Two Stroke Sniffer Joined: 02 May 2011 Karma :

Thanks everyone for the advice, I have upjetted to match the exhaust which is working a treat. So from here I plan to now do the rollers, as the stiffer clutch springs benefits dont appeal to me. I have found two set of rollers, 9g and 6.5g the oem rollers are 12.8g. Now by "lighter" which one is that supposed to mean 6.5 or 9?

Thanks Paul
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First ever bike - 1980's Honda XL 250 (Offroad), 2004 KTM SX 125 Rattray Edition, 2004 Yamaha DT125RE, 2006 Husky WRE 125, Speedshite 100, Current- Car....... Sad

SpannerMonkey · World Chat Champion Joined: 26 Aug 2010 Karma :

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

its working a treat.........

Have you checked the plug condition? Just because all seems ok, you should still check what colour the plug tip is in

P3TR0L H34D · Two Stroke Sniffer Joined: 02 May 2011 Karma :

Thanks littletomos50 for your advice I will try the 9's and see how I get on. As for the plug, it seems to be a nice coffee brown as before, but I've only riden it once so far, so I will put a new plug in and keep an eye on it, just to be 100%

Paul
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First ever bike - 1980's Honda XL 250 (Offroad), 2004 KTM SX 125 Rattray Edition, 2004 Yamaha DT125RE, 2006 Husky WRE 125, Speedshite 100, Current- Car....... Sad