Nibbi on Templar - Page 2

Megadan · 06-02-2023, 07:44 AM

Quote:

Originally Posted by jc3

Problem is getting it "fully up to temp" when it won't idle or even run on choke.

Oh? What about this older post?

Quote:

Originally Posted by jc3

I can't get past 55 on the stock. There is a lot of popping and stumbling in the throttle. After about 30 minutes the carb over heats and just stalls out, probably too lean.

Which leads me to my last post...

Quote:

Originally Posted by Megadan

Sometimes it helps to reset.

Fast_Freddy · 06-03-2023, 04:31 PM

Follow Megadan's instructions for jetting. I suspect you had a vacuum leak while attempting to jet the Nibbi. Go slow, and only make one change at a time. Don't waste your time on a narrowband O2 sensor. They act like an on/off switch and are only useful for finding stoichiometry (14.7:1 AFR). This is fine for idle and midrange but too lean for 3/4-full throttle. You want more like 13:1 for high engine load. Is there a motorcycle shop nearby with a dyno? They could either jet your carb or provide a dyno sheet with AFR curve you could use for tuning. GL

Edit: After more thought the narrow band O2 sensor could be useful for baseline tuning. Afterward just increase the main jet by a few steps. Also, once the bung is installed you could upgrade to a wideband sensor later on.

XLsior · 06-10-2023, 12:06 AM

if you're referring to the paper gaskets that come the nibbi and the insulation spacer...

I didn't install the spacer just 1 paper gasket with a light coat/smear of RTV/gasket slazz.

But if there was really a leak the bike would typically behave lean and spluttery.

The o'ring plate and paper gasket might help...its basically another insulation spacer plate and another paper gasket....

06-03-2023, 04:31 PM	#17
Fast_Freddy Join Date: Nov 2022 Location: Pennsyltuckey Posts: 291	Follow Megadan's instructions for jetting. I suspect you had a vacuum leak while attempting to jet the Nibbi. Go slow, and only make one change at a time. Don't waste your time on a narrowband O2 sensor. They act like an on/off switch and are only useful for finding stoichiometry (14.7:1 AFR). This is fine for idle and midrange but too lean for 3/4-full throttle. You want more like 13:1 for high engine load. Is there a motorcycle shop nearby with a dyno? They could either jet your carb or provide a dyno sheet with AFR curve you could use for tuning. GL Edit: After more thought the narrow band O2 sensor could be useful for baseline tuning. Afterward just increase the main jet by a few steps. Also, once the bung is installed you could upgrade to a wideband sensor later on. __________________ 22 Templar 250 Last edited by Fast_Freddy; 06-03-2023 at 08:21 PM.
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06-10-2023, 12:06 AM	#18
XLsior Join Date: Aug 2020 Location: Australia Posts: 1,317	if you're referring to the paper gaskets that come the nibbi and the insulation spacer... I didn't install the spacer just 1 paper gasket with a light coat/smear of RTV/gasket slazz. But if there was really a leak the bike would typically behave lean and spluttery. The o'ring plate and paper gasket might help...its basically another insulation spacer plate and another paper gasket....
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