| Author | Message | ||
     Joseschopshop |
What parts do I need to run 90 HP and 90 TQ at the rear wheel on a 1998 S1.The bike bone stock and tight with very low miles.I have a new Mikuni,Force pipe and intake ready to install.Do I need to upgrade the heads,cams and ignition to hit my mark?I just need a little more under the hood. | ||
| Loki |
Are we talking S1 or S1W? If an regular S1, ditch the heads and replace with T-Storm or XB heads. The XB heads are the better choice and better starting point for port work. Stock ignition? This will hold you back on the upper revs. It starts to cut back at 6200 rpm. The race ignition module is good to 6800. Force pipe is good. And Loud! CV vs. Mikuni about par at this level. Although the Forcewinder may cause a problem with the CV(chk the KV on this) The Mikuni will give you better feel and response. ***I am looking fwd to my 97 S1 hitting the 105-110hp numbers. The parts are here and back from other reals. | ||
| Ratbuell |
The other nice thing about XB heads - correct me if I'm wrong - is that they can use the stock pistons, where the t-storm heads require a piston change as well. Not that t-storm is a bad choice. I put t-storm heads, pistons, and X1 cams in my S2. WHAT a difference. I haven't dynoed it, but it feels very similar in power to my race-kitted (header, muffler, ignition and a/c) S1W. | ||
| Limitedx1 |
buy an x1 motor....hehehehe basically you have to build your motor to x1 spec and you will be on par with your numbers, minus the injection | ||
| Sloppy |
Do you want more power or to go faster? If you want to go faster then invest the money on track days! | ||
| Spiderman |
What year is the S1? Does it have the heavy flywheels? If so here is numbers from a S2 I worked on and mods 102 RWHP 90FTLB Stock crank XB1250 kit Stock XB heads 536 cams 42mm Mukuni Flat Force Exhaust Hi flow air filter My bike, 95 RWHP 92FTLB 1200 cc Stock crank (2000 Model year) XB heads and XB12 pistons 536 cams 42mm Flat slide KT exhaust, (comperable to the force) Hi Flow Air Cleaner | ||
| Joseschopshop |
The bike is a 1998 S1......Not a S1W.I'm trying to figure out what I have and what I need.I'm trying to gather all the parts I need so I can do everything when I do my swingarm swap.I guess my main concern would be trying to figure out what cams I have/need and the potential of the non Thunderstorm heads.I don't want to rag it out or race it.I just want it to have a little more huevos. | ||
| Loki |
The "lightning" heads you have are your big limiter. Your stock cams should be good to go. My '97 has the 15-x series(stock) which are rough equivs to Andrews N4. The simplest upgrade at this point....is to get hold of a set of XB heads. Add the XB12 pistons to keep the CR up. BUT you can use your current flat-tops at a slightly lower CR. The above with the other parts you have will get you into that ball park. I ran the stock XB head and stock S1 piston and still netted 85hp at the wheel | ||
| The_italian_job |
do you guys think that getting a set of XB pistons, on an S1WL, would give me a good HP increase? or a single fire ignition module also, would get the WL motor better? | ||
| Sportyeric |
Its important to mention that the XB heads require a newfront mount that runs about $300 (?) | ||
| Loki |
XB pistons under a T-Storm head? Not worth the effort even if it can be done. Spend the money on a set of aftermarket pistons designed for the head. XB head over a T-Storm piston? A good choice but the head needs the required squish band cut into it. A single fire ignition in the stock motor? Not going to net you much for the cost. |
