Templar M Stuttering

[NYCDiesel]

Hey guys, picked up a Templar M when they were on sale about 6 months ago. Since the weather has been picking up I have been riding it more often but have been having an odd issue that is really starting to get annoying. Whenever I try to maintain top speed/rpms on my templar after maybe 15-20 seconds I lose all power and have to back off the throttle to about 50mph then slowly start rolling on the power again and it will be fine. I'm pretty sure it must have something to do with the carb jetting since I live in the mountains of PA, 1700 ft above elevation. I'm going to give that a go soon but do you guys have any other ideas of what it may be? The reason I got the M is for the adjustable suspension, I have been riding for over 15 years and this is my first dirtbike and am having a blast plowing through trails. I attached a picture of my RR and Templar, would appreciate any help.

[NYCDiesel]

Is this the best way to adjust the stock PE28 carb?

[XLsior]

is it a doughy blugh stall (rich) or a scream pap then cut out (lean)?


Yes you can remove the tamper proof screws and then do normal rejetting on the stock carbs...


I'd be inclined to believe you elevation (less dense air) on stock jetting is probably rich and might need smaller jetting...

[Thumper]

Before changing jets, drill out the airscrew access and try closing that screw by a half turn. See what that does. This will give you a clue as to which way to go.

These bikes ship too lean for sea level. You could still be a bit lean at under 2k feet.

I think people at 4k elevation are pretty close with stock jetting

[NYCDiesel]

It backfires right before it starts decelerating so usually I'll be like maintaining 65mph and then it cuts out and while slowing down it backfires a little bit, I have to let off the throttle to get down to about 45ish and then can roll back on the throttle and it will be fine if I just hover around 50 but if I start pushing past that for more then 30 seconds or so it does what I stated above.

I'll try to get a video of it but of course its rain all day today.

Thumper, the airscrew is what the video I posted is referring too right? Thanks for the help guys, it gets annoying because I'll be going the speed of traffic at and then the bike just starts decelerating and I feel like an idiot because on my RR I just pass everyone lol.

[Megadan]

I would cut the ignition the second it loads up and starts to slow down. Come to a stop with the engine off, pull the plug, and read it. It may not be perfect, but it should give you a decent window into what is going on with the fueling (if it is the fueling) during wide open throttle.

Also, the mixture screw is for the idle mixture. Adjusting that isn't going to do much of anything to help wide open throttle.

Did the bike sit with any fuel in the carb, or with the petcock open, during the last 6 months? Did you run at those rpms and speeds previously? It may just be some junk blocking the main jet or the needle seat emulsion tube. Nothing a good cleaning couldn't fix.

[Thumper]

My air screw was way off, and it caused issues up in midrange cutting out. I never knew it could happen, but it did. Closing the airscrew fixed it!

[Megadan]

That's because every jet and setting adds to the total fueling. The idle mixture will always add its little bit of fuel to the circuit, and thus can make a minor correction to mask or heal something that may be slightly off with another circuit.

[Megadan]

[NYCDiesel]

No, I only got the bike about 6 months ago and have been riding at least once a week. My gut feeling is that it is too lean but this specific issue has been happening ever since I started taking the bike WOT. It cuts out like your out of gas/need to switch the petcock but that's definitely not it bc like I said before I just lay off the throttle and reapply it slowly it will start running again.

What would be the best option to get it running properly, buy one of the nibbi carbs? I'll do what you suggested megadan and next time I'm riding it I'll take a video and check the spark plug.

[Megadan]

Does it run that nibbi carb or the stock carb when it has this problem, or is that not you in the above video?

If you don't have a nibbi on this bike, yes you can simply order one and jet it accordingly. Otherwise, unsealing the stock carb and jetting it is also an option.

The only way to know for sure if it is something fueling related would be to do a plug chop, but if you think it is that lean I would almost be concerned that you may be on the verge of a soft seizure, which is why it slows down and needs a moment to recover. That would happen if it is very lean at wider throttle positions. Basically, the piston is getting hot enough from the lean burn that it's expanding faster than the cylinder.

You could do the simple man (my approach) and put a larger main jet in and see what happens. If you are lean, this will make your symptoms reduce or go away entirely. If rich, it will get much worse lol.

[J4Fun]

I agree with everyone’s thinking, but wanted to ask about your valves are they adjusted correctly and is it possible that you have a kinked fuel line? Thumper didn’t you mention someone having a kinked line on a Templar? Post #1 made me think about the fuel line. Trying to help….

[Thumper]

Originally Posted by J4Fun

I agree with everyone’s thinking, but wanted to ask about your valves are they adjusted correctly and is it possible that you have a kinked fuel line? Thumper didn’t you mention someone having a kinked line on a Templar? Post #1 made me think about the fuel line. Trying to help….

Yes. I don't know if the M has the same twin input petcock, buy my left lobe feed was definitely kinked. I just shortened it, and that straightened out the kink, relieved the flow issue. It was staring me in the face, so I felt kind of stupid

[J4Fun]

By the first post it sounds like there is a fuel flow problem, doesn’t mean a kink but can be or filter or… maybe if the poster makes sure there’s not a fuel flow problem, then go for the carb changes. That 15 or 20 seconds part gets me thinking that…

[Thumper]

Yes, fuel flow. Could be a dirty, or misadjusted float bowl valve too.