Delkevic Slip on Review

[Firehawk068]

I am seriously considering taking my Kerker 4-into-1 system off the FJ, and getting a pair of their slip-ons. (mine is an '89)

Since their US headquarters is here in Denver, I am probably going to ride the FJ over there and make sure their pipes fit properly.

I don't know if the ('91-up) FJs would use the same ones, but maybe they can take the proper measurements off of mine.
I could probably leave the bike with them if they need it for a week or whatever.  I may be able to find a ('91-up) FJ to run over there with me also when the weather warms up.
Maybe they would be interested in engineering proper fitting extension pipes, if we could supply them with the bikes?   

[aviationfred]

+1.      That is a great idea...... Even better would be if the weather forecast is crappy, so you wont miss the bike being gone.


Fred

[Firehawk068]

I mistakenly said mine is an '89. It's a '90. My Bad. ('89 and '90 should be the same)

I need to free up some garage space, and start putting stuff in my new shed, so I have room to work on it.
A quick look at their website shows their slip-ons for FJ as fitting only (3CV) "89-"91
I don't think this is correct, as this picture shows.
My '90 has the muffler mount after the rear foot-peg.
Leon's '91 mounts the muffler before the rear foot-peg (I think this is the same as '92-up?)



This could be part of the reason they are getting the fit wrong. 

Anyway, I'll contact them and see if they have any interest in fixing their fitment issues.

Once I get some space freed up, I'll put my stock system back on, and take it over there.
I'll probably be cleaning up the Kerker system and putting it up for sale if anyone is interested.

[FJools]

My 350 mm Delkevic arrived today.  
Now I have to wait for better weather. For whole week pouring rain outside....

Which model type did you order ??

[MOTOMYSZOR]

Which model type did you order ??

http://www.ebay.ie/itm/350mm-Inox-Ovale-Silencieux-Pot-Echappement-Yamaha-FJ1200-3CV-89-90-/151382184113?hash=item233f14d0b1

[MOTOMYSZOR]

Weather is extremely sh....ty  So I just managed to check how it will fit. Surprisingly the only issue is hanging point so all I need is proper bracket.

[X-Ray]

Will be excellent once they are fitted up

[MOTOMYSZOR]

Road test done  

For proper fitting I had to make only two brackets. I am surprised because centre stand retracts back to acceptable level and even rubber holder on middle pipe is in right position....

Without DB killers is loud but not too loud, and sound is very similar to Subaru Impreza......

[MOTOMYSZOR]

Today I had finally weather good enough to do longer road test.

No mater what RPM, cold or hot everything is perfect: almost no popping from exhaust (only when I push her hard), smooth reaction on change in throttle position on motorway or in city.... Any bleep tests.... all OK.
  Engine stars on button no matter cold or hot....
But engine temperature meter shows average 5 degrees more then before on motorway. Also I believe that in city temperature rise quicker.....
Should I be worried about temperature raise?
Just in case: I have UNI air filter and stock jets in carbs. Just changed needle position and pilot screw 3,5 turns out.

[FJmonkey]

A higher temp suggests being lean. What pipe did you have before?

[MOTOMYSZOR]

A higher temp suggests being lean. What pipe did you have before?

It was Motoda Neta exhaust system

[FJmonkey]

A quick search of that pipe shows it replaces original pipes without rejetting. If the Delvic pipe is less restrictive then you did make things a bit leaner. You might need to go larger on your main jets. My '86 ran well when it was real lean. Maybe Randy can offer some jetting advice. Others have installed Delvic systems with pods, maybe they can say what jets or changes they made.

[billwest]

I put a Dynojet in mine, with Stage 1 jetting; 3 turns out on all idle mix screws.
Also have an ignition advancer, and K&N replacement Filter.
I have kept the "silencers" in, as I find it runs better that way.
Overall runs very well.

[MOTOMYSZOR]

I can't find on internet any information about difference in engine temperature after exhaust upgrade......

On old exhaust motorway temperature was 80*C and after exhaust change it rose up to 85*C. So  it is still pretty low for an FJ. In traffic will quickly raise up to 100*C - 110*C.

My plan is:
-First to compare engine temperature with or without DB killers - I am relay curios if that will make any difference....
-Then turn out pilot screws 4 turns and rise needles and again test temperatures.

If that will be not enough I will change float level (23mm) and main jets to 115.

[billwest]

Why not go to an auto-tune shop, and get your exhaust gas analysed.  That should tell you if you're running lean or not.
Maybe it is not running lean, but running like it should.