The Delta Project

[SHELRACING]

Wonder how the exhaust will perform, most people I've seen are going for quite a short pipe with the muffler pretty much under the engine.

Yep running under the motor was a consideration, and our other bike The FXR/loncin does run the pipe under the motor. It would be easy take off the loncin and put on the delta because the Loncin used the original fxr header pipe.

I've seen other FXR's running the pipe out the back, and performing quite well. So we'll see how it goes.

I'm going to fit a pumper carb too. So I'll see if I can get John Connor up in Auckland to run the bike up on his Dyno when I get the bike running

[gav]

Have you increased the diameter of the header pipe or is it still standard size?
What carb are you looking at using? I've been using a GN250 carb on my FXR that has been OK, and have just got a DR200 carb to use, which appears to be a CV flatslide. Gone to a 150 main jet and looks like it'll be OK. Would like to try a pumper carb but seem hard to find and/or pretty expensive!

[SHELRACING]

Have you increased the diameter of the header pipe or is it still standard size?
What carb are you looking at using? I've been using a GN250 carb on my FXR that has been OK, and have just got a DR200 carb to use, which appears to be a CV flatslide. Gone to a 150 main jet and looks like it'll be OK. Would like to try a pumper carb but seem hard to find and/or pretty expensive!

For the header I used the flange from a Suzuki Goose header pipe it is considerably better than the FXR, it needed some minor grinding to get it to fit, Then I welded it to the pipe supplied by Pit Stop which was 38mm. The only concern may be the muffler I purchased it from SRS in Christchurch. It is said to be a race muffler designed for the FXR. Looks great and is very light. But looks like restrictor plates inside the pipe. I have been told not to remove them and try it first. We'll see how that goes.

As for the carb I have a a Pumper carb already on the Loncin so I'll borrow it and try that first. I hear the flatsides are one of the best carbs to use. But one of the FXR riders in Auckland ran a pumper for the first time last meeting. The improvement was obvious an dramatic. Interestingly he ran it without the pump connected for a while and it still ran very well.

I know where you can get a pumper carb if you want one Gav but they are around $135... Even at that price they are a great investment.

[Buddha#81:Me]

The only concern may be the muffler I purchased it from SRS in Christchurch. It is said to be a race muffler designed for the FXR. Looks great and is very light. But looks like restrictor plates inside the pipe. I have been told not to remove them and try it first. We'll see how that goes.

I've got one too, I pulled it apart and removed all the restrictor and baffles, then moved the end restrictor to the middle of the perf tube. The way yours is now will probally give you more torque and suit your track. Try it first, easy to mod and I put screws in mine instead of rivets. I also kept my header short which is ment to help top end performance. I gained 9 kmph top end and saved 2-3 kgs to compensate for my fat guts.

[gav]

I know where you can get a pumper carb if you want one Gav but they are around $135... Even at that price they are a great investment.

Is that a new carb?

[SHELRACING]

Is that a new carb?

It is now listed on the website at $110, The carb is from the Newmanz website out of Auckland so there would be postage as well. Bear in mid you need to make new throttle cable (slide and pump). I used a CB 125 twin cable as starting point, changed the length a bit and added adjusters to it for the pumper. Here's a direct link if you want to have a look.

http://newmanz.co.nz/shop/index.php?...rd=pumper+carb


When i get mine fitted to the Delta I'll post a pic.

[nudemetalz]

What difference do you think the pumper carb makes?
I've never deactivated mine to find out.

[Bren_chch]

What difference do you think the pumper carb makes?
I've never deactivated mine to find out.

bugger all... maybe just maybe a little help off the line!


love the underseat exhaust!

[SHELRACING]

What difference do you think the pumper carb makes?
I've never deactivated mine to find out.

Well, A very competent Auckland rider fitted a pumper to his FXR and ran it for the first time last meeting. Initially he ran it without the pump. As I said before the diffierence to the bike was dramatic. It was considerably faster, according to the rider, right through the midrange.
I can't ramble on enough at the change in the bike. However when he did connect up the pump, I didn't see any real improvement from there. Although the pump wasn't adjusted up properly.

The pump on the Loncin is setup to pump, Straight off the throttle. So it won't make much difference off the start. Cos my throttle is already at 3/4 when the flag drops. However I do think it makes a difference coming out of corners, and rolling on/off in tight sections of the track.

[Bren_chch]

edit:

must be a different type of pumper carb ... pumper carbs only squirt once after throttle has been closed and then opened again, i cant see how it would effect bugger all, unbless u like to race in very low revs, infact on my fxr motor it seems to do fuk all, yow ling runs the same carb on his fxr without the pumper arm connected and it seems to make no difference between bikes... confusing stuff, i guess only a dyno run could possible tell 100% what is going on, but thats my take on them!

[Bren_chch]

actually thinking about it pumper carbs where first developed for the dirtbikes, help them get up and go out of the rutts, MUD, etc, is that not correct? they have no real road race advantage.

[stanko]

I've got one too, I pulled it apart and removed all the restrictor and baffles, then moved the end restrictor to the middle of the perf tube. The way yours is now will probally give you more torque and suit your track. Try it first, easy to mod and I put screws in mine instead of rivets. I also kept my header short which is ment to help top end performance. I gained 9 kmph top end and saved 2-3 kgs to compensate for my fat guts.

What your guts only weighs 3kg? 666 posts you must be the beast

[Buckets4Me]

thats what he is trying to say I think
when the throtel is shut of then opend again it pumps
as in most of the corners you shut off the throttle then on again
it's a tight track

[Bren_chch]

OHHH u ride them funny little tracks ay!!! my bad excuse me!

[Buckets4Me]

you coming to taupo