How Do I I.d. An Exhaust?

Not my area of expertise so I'm hoping someone can help. Got my third Bonnie last week (2001 790cc model) and she has peashooters but they don't have any markings on them to say what they are. I am guessing that they aren't Triumph as all the OEM ones I have seen have part no's etc. stamped on them and I don't think they are Norman Hyde Togas as I have those on my other 2001 Bonnie and the Togas are shorter and squatter where these are, if anything, marginally longer than stock. They aren't nearly as loud as the Togas either. Any ideas on what they are or how to find out?

 

When it stops raining I'll get her out and take a pic or two of the exhausts.

 

Well I found the answer while taking some pics to put on here. I stuck my phone under the exhaust where I couldn't see myself without lying on the ground and, lo and behold!, printed on the underside of the exhaust is the details of the exhaust - Triumph A9600401 NOT FOR ROAD USE

I am shocked and horrified, how on God's green did this pass the beady eyes of that nice MOT man? Now all I have to do is figure why the bloody bike is spluttering badly at low revs and when cold and I will be happy.

 

Thanks for that advice @MadMrB You know I haven't actually looked under the side cover yet. The original snorkel is actually in one of the Givi panniers that came with the bike so I have assumed that a mod has been made but I have to add that there is a Triumph Twin Power Bellmouth (still in box) and a DNA filter that looks brand new in box also in the pannier.

The problem I am having is that, if you crack the throttle too quickly while at a standstill the engine will die and needs to be gently revved and also, if I let the revs drop too low on the road the engine will stutter and bog down when I try to accelerate. This is worse when cold. I suspect that this is a fuel system problem but I am so rusty I could use a few pointers.

 

@MadMrB I suspect that, given that the Air Injection has been removed and blanked off and the presence of the Triumph Twin Power Bellmouth and DNA filter in the pannier, that the previous owner had bought the TTP 'Stage 1 Torque Induction kit' so hopefully that means that he fitted the suitable TTP jets for a Triumph TORS exhaust. I am desperately trying to remember my 'how carbs work and how to adjust them 101' but I'm drawing a blank at the moment. I am wondering if it might be mixture related either getting too much or too little fuel when coming off the pilot jets onto the main jets but that is a stab in the dark. Need to consult the text books or an expert.

 

@Kinjane Is that the same stuff that is available through ebay? https://www.ebay.co.uk/itm/Star-Tro...307649?hash=item59542cbdc1:g:-roAAOSwAchfKZQV

If so I am guessing that it would be worth my while to buy the 250ml bottle https://www.ebay.co.uk/itm/Star-Tro...477938?hash=item3f400c2732:g:H7UAAOSwqK9fQpIX

 

250ml bottle of Star Tron ordered from ebay. Unfortunately, although I live on a sea loch with yachts and a small marina I doubt anyone locally would have any Star Tron and it's a sixty mile round trip to the nearest chandlers I know of so would cost me more in petrol that I would save. Hopefully it will sort things out. Certainly the bike had done little more that sixty or so miles a year over the last ten years before I bought her (I suspect it was to the MOT station and back) and so there is every chance her carbs are a bit gummed up. She is not lacking at all in power in the higher rev ranges in all gears and it seems to be around about 1500 to 3000 revs, depending on gear, that she suffers a stutter and bogs down.

 

Well interesting news... I got some Star Tron and put it in and there was a little improvement but she was still pretty much suffering the same stutter and dying when I twisted the throttle any more than gently and would choke at low revs on the road.

Next step was to have a go at the pilot screws before taking a deep breath and overhauling the carbs. Guess what! The mixture screw on the left-hand carb was at exactly zero turns out and the right-hand one was at about 3/4 of a turn out. Not having a pilot screw driver in the toolbox I had to guesstimate the number of turns I wound them out but making them the roughly three/three and a quarter turns that my other '01 Bonnie has noted in her history as the pilot screw settings the problem vanished on the spot and she was roaring like a good 'un. In my other Bonnie's history notes it is noted that the mixture screws were set to this to cure a 'hesitation' at 2,000 rpm. This bike was definitely a bargain and I am guessing that part of that was because she was being off-loaded as a rough runner!