Triumphrat

Bob_N · 02-11-2006

I was recently told that I would benefit from the removal of the restrictor plate and snorkel on my 05 bonne black. What are these and how do I remove them? The bike is going to the shop next week for new pipes, jet kit and k&n filter and I want to do this before they get it. Any help and information will be greatly appreciated.

Bob

meatwagon · 02-11-2006

The snorkle part is easy...remove the left side cover with a quarter or flat screwdriver and pull the snorkle out,it really just pulls out.Your bike might run rough at lower and mid revs if you don't adjust the carbs for this.Do it just before it goes into the shop(or let them do it).The 'restrictor' or airbox divider is another story.You can remove the entire right side of the airbox and slide it out or destroy it, removing pieces out through the filter chamber.Do a search here because I've seen both methods described.
Personally I would leave the divider in,but that's just me.Let others guide you here.
What kinda pipes are you getting?

Ridge · 02-11-2006

Once again for your viewing pleasure!

dazco · 02-11-2006

Snorkel removal has worked for most people, and the ones it didn't it's usually because they just removed it and din't rejet. You must have a balance in the air/fuel mix for anything to work. some have thier bike running on the lean side then when they remove it the mix becomes too lean and it doesn't help so they write it off as a bad mod because they never took the time to rejet for it. Others with a richer mix may see an improvment right away. But you should always make sure the jetting is right in order to see the benefits.

The restrictor is another story. I've heard more bad results than good, and it's been said that removing it causes more problems with air turbulence in the box than any benefits from more airflow. Many have said not to do it, so that one is a harder call. But removing the snorkel is an almost sure thing as long as the bike is rejetted for the extra flow. I got a considerable boost in power/acceleration removing mine, tho that was after i put on free flowing pipes. Thunderbikes did dynos on a speedmaster like mine at various stages of modification and saw a 2 HP increase just by removing the snorkel.

bforbes · 02-11-2006

which part is the snorkle and which is the restrictor ?

Brooksie · 02-11-2006

I had lost a side cover screw when on the road and had to drive 10 miles to the next stop with the side cover in the tail bag. The bike ran so roughly and cut out twice, just with the side cover off the bike. I have the stock air box, too. Safety wired the cover back on for the rest of the trip and she ran great. The stock air box configuration has been engineered to provide optimal air flow CONTROL to the intake system and provides great reliability to operation. I used to do alot of air box removals to in-line fours in the 80's and 90's and we had alot of tweeking to jets after that. To me, unless you're going to race it or do not mind tinkering constantly, keep the stock box. After removing all those parts, might as well get a NARK and pod filters.

Brooksie · 02-11-2006

Also, great pics and advise if you want to go that way! That's what is cool about "Twin Talk", lots of experience!

dazco · 02-11-2006

Quote:

On 2006-02-11 15:39, bforbes wrote:
which part is the snorkle and which is the restrictor ?

The restrictor is that part lined with yellow. The snorkel isn't shown there, but it's easy to find. It's the rubber nozzle that sticks out of the opening to the air filter. I have a speedy which is situated differently, but on the bonny i think if you take the side cover off you'll see it right there in your face. It just pulls right off and snaps right back on, as it's not held in place by bolts.

keef · 02-12-2006

Quote:

On 2006-02-11 12:19 meatwagon wrote:
You can remove the entire right side of the airbox and slide it out or destroy it, removing pieces out through the filter chamber.

mw,
You're right, although I would recommend the first of your two options, as it is reversible. I've seen one or two comments to the effect that the airbox has to be removed in order to slide the restrictor plate out - this is not true. I've recently removed my restrictor plate and, although there was the odd tricky bit, it was fairly quick and easy.
The difference in throttle response was considerable (but then I have just bored the barrels out to 904cc).

For those who might be interested or bored enough to view them, I can happily post a couple of pictures I took of the process (with comments, if I can think of anything helpful).
Meanwhile here's a comparison of the gap sizes that might be of interest.

[ This message was edited by: keef on 2006-02-12 10:08 ]