Secret Weapon - FXR150

**Yow Ling** · 30th October 2009, 20:02

Originally Posted by DELLORTO

the stock fxr muffler is 7kg! and is the most resrictive muffler ive ever seen.....you can get pit bike mufflers for $100, give yourself 5hp+

looks like bullshit , smells like bullshit , tastes like bull shit , must be bullshit, you dont get 30% increase from a pipe

**richban** · 30th October 2009, 21:57

Originally Posted by DELLORTO

the stock fxr muffler is 7kg! and is the most resrictive muffler ive ever seen.....you can get pit bike mufflers for $100, give yourself 5hp+

Shit 5hp

Why did I waste all that time and effort with cams pistons and lighting shit. I should have just brought a magic muffler. Bullshit!!!!!!!!! to the power of ten.

**Pumba** · 30th October 2009, 22:06

Yes I think we can all smell a bit of bullshit, but I am sure we expect nothing less of Max now days.

I am still not convinced on race shift personally. I feel I do to much road riding and that the chance of me going one way or the other on either the road bike or the bucket when things turn to shit (i.e automatic with no thought) and it may not end well.

**richban** · 30th October 2009, 22:18

Originally Posted by Pumba

Yes I think we can all smell a bit of bullshit, but I am sure we expect nothing less of Max now days.

I am still not convinced on race shift personally. I feel I do to much road riding and that the chance of me going one way or the other on either the road bike or the bucket when things turn to shit (i.e automatic with no thought) and it may not end well.

I am changing mine this weekend. I still have to think about shifting with my left foot. My laverda shifter is on the right. Try hooking your toe under the break to change gear. It don't work.

I have sold it and don't ride on the road so should be ok.

**Henk** · 31st October 2009, 10:44

I've got two buckets, old girl race shift, FXR in the process of being built normal shift. Get on the old girl, no problem, get on the FXR, start going the wrong way in the box for a couple of laps. Road bike is standard shift and have no isses when I get on it. Of course your mileage may vary.

**F5 Dave** · 31st October 2009, 10:52

Just remember if we make these bikes too loud we will lose tracks.

With so called race shift you have to ask yourself how much attn you want to be giving to changing gear beyond 'When'?
esp if you ride road or dirtbikes you will always pay some attn to it.

Originally Posted by F5 Dave

Oohh oohh I can feel one of my cliches coming on.

here it comes, here it comes. . . . .

Kevin Schwantz always used std road shift. I'll change over when I get better than him.

**hmurphy** · 31st October 2009, 11:05

Yeah the muffler is heavy as hell and restrictive on the FXR but I can't see 5hp increase from turning it into a straight through pipe. And I cut out a decent size length of the pipe so I could mount it under the bike and the section I cut out was HEAVY. Any other FXR secrets that everyone knows about? Apparently my stock carb is a piece of shit.... anyone have any suggestions?

Overall I am not too fussed with increasing the power of the bike, it really just needed a gearing change I think. It still seems quite competitive against the other A grade buckets and it is a stock FXR150 with just handling modifications

**TZ350** · 31st October 2009, 11:50

.

I use race shift, push down to change up a gear because I find it easier to up shift in a left hand corner, like anti clock wise in the MT Welly sweeper that way. With ordinary shift Up for Up I find that its possible to hit the ground with my toe under the lever and involuntary upshift, a bit disconcerting under power, mid corner, and full lean.
.

**Sketchy_Racer** · 31st October 2009, 15:12

Race shift is personal preference thing is just like different riding styles, there's no right or wrong, it's what works for you.

I use race shift as I got sick of struggling to shift around left hand corners and now I hate racing with standard shift! Funny though that I don't have a problem riding dirt bikes in standard shift??

**richban** · 1st November 2009, 08:56

Originally Posted by hmurphy

Apparently my stock carb is a piece of shit.... anyone have any suggestions?

I am a fan of the TM28 mikuni (4 stroke version). Main jet around 280 standard needle and start jet. They don't go straight into the standard manifold you have to make a spacer to size up the spigot. I messed up the spacer and ended up with a manifold leak and it drove me mad so if you do it, do it right.

**gav** · 1st November 2009, 09:27

A good upgrade for a carb is to use a standard GN250 to start with. Otherwise a flatslide carb off an earlier DR200 is one to look out for, as is an earlier XR/XL250 carb.

**richban** · 1st November 2009, 11:53

Originally Posted by gav

A good upgrade for a carb is to use a standard GN250 to start with. Otherwise a flatslide carb off an earlier DR200 is one to look out for, as is an earlier XR/XL250 carb.

When I changed carbs from standard to the TM I got 1.and a bit more hp out of it. Has anyone ever documented the gains of these other carbs?

**UNSTABLE** · 12th November 2009, 06:00

The stock carb is best served as an interesting paperweight, or possibly a nice manly decoration for a potplant...

A decent well set up carburetor is worth in the region of 2rwhp. Simple. The stock manifold is surprisingly resilient and will stand having an enormous carb bunged into it. I ended up changing to a Mikuni accessory manifold that bolts straight on, you do need to match it the port though.

My bike has a monster 36mm CV carb on it, and I think most people who have seen it go would agree it goes rather well. I'm not suggesting it's the ideal solution, just that FXR's don't appear to be that fussy on what carb is on there as long as it's not the stock one... Weird...

**Shorty_925** · 12th November 2009, 07:45

Originally Posted by gav

A good upgrade for a carb is to use a standard GN250 to start with. Otherwise a flatslide carb off an earlier DR200 is one to look out for, as is an earlier XR/XL250 carb.

What size jets are you running in the GN carb?