GummyCarbs - Recent changes [en]

Rotax V990

Jeff — Fri, 05 Jun 2026 00:50:45 GMT

General Specifications

← Older revision		Revision as of 00:50, 5 June 2026
(5 intermediate revisions by the same user not shown)
Line 1:		Line 1:
			==General Specifications==

			=== Weight ===

			The December 2001 V990 workshop manual lists the engine weight as 143 lbs. The October 2003 V990RR workshop manual lists the engine weight as 148 lbs.

			=== Displacement and Compression Ratio ===

			According to the December 2001 V990 workshop manual:

			<div style="margin-left: 2em;">
			{\| class="wikitable"
			! colspan="2" \|   !! Displacement !! Compression Ratio
			\|-
			! colspan="4" \| RSV, RSV-R Tuono, Mille
			\|-
			\|   \|\| Up to 2000 \|\| 997.6 cm³ \|\| 11.4±0.5:1
			\|-
			\|   \|\| 2001 and later \|\| 998.00 cm³ \|\| 11.8±0.5:1
			\|-
			! colspan="4" \| SL Falco
			\|-
			\|   \|\| Up to 2000 \|\| 997.6 cm³ \|\| 11.4±0.5:1
			\|-
			\|   \|\| 2001 and later \|\| 998.0 cm³ \|\| 11.8±0.5:1
			\|-
			! colspan="4" \| RST Futura
			\|-
			\|   \|\|   \|\| 997.62 cm³ \|\| 11.8±0.5:1
			\|-
			! colspan="4" \| ETV Caponord
			\|-
			\|   \|\|   \|\| 998.00 cm³ \|\| 10.4±0.5:1
			\|}
			</div>

			=== Cam Timing and Lift ===

			According to the December 2001 V990 workshop manual, the RSV Tuono, RSV-R Mille, and SL Falco all have the same 262° intake and 259° exhaust. The 2001 and later RSV Tuono and RSV-R Mille have a 0.45in (11.40mm) intake lift, and all other intake and exhaust valve lifts for the RSV Tuono, RSV-R Mille, and SL Falco have a 0.42in (10.60mm) intake and exhaust valve lift. The RST Futura has 259° intake and exhaust, with 0.42in (10.60mm) lift. The ETV Caponord has 242° intake and exhaust, with 0.37in (9.5mm) lift.

			==Slipper Clutch==

	Pneumatic Power Clutch/slipper clutch/PBTL System details are in [https://www.apriliaforum.com/forums/showthread.php?65496-Aprilia-Rotax-and-V990&p=745935&viewfull=1#post745935 this apriliaforum post].		Pneumatic Power Clutch/slipper clutch/PBTL System details are in [https://www.apriliaforum.com/forums/showthread.php?65496-Aprilia-Rotax-and-V990&p=745935&viewfull=1#post745935 this apriliaforum post].

Rotax V990

Jeff — Thu, 04 Jun 2026 21:47:13 GMT

Created page with " Pneumatic Power Clutch/slipper clutch/PBTL System details are in [https://www.apriliaforum.com/forums/showthread.php?65496-Aprilia-Rotax-and-V990&p=745935&viewfull=1#post745935 this apriliaforum post]. <blockquote> PBTL SYSTEM The PBTL system on the RSV 1000 reduces the ‘braking’ torque transmitted by the engine during deceleration. OPERATING PRINCIPLE: Line 1 is connected to the intake passage whereas line 2 – downstream of the retaining valve – is connecte..."

New page

Pneumatic Power Clutch/slipper clutch/PBTL System details are in [https://www.apriliaforum.com/forums/showthread.php?65496-Aprilia-Rotax-and-V990&p=745935&viewfull=1#post745935 this apriliaforum post].

<blockquote>
PBTL SYSTEM

The PBTL system on the RSV 1000 reduces the ‘braking’ torque transmitted by the engine during deceleration.

OPERATING PRINCIPLE:

Line 1 is connected to the intake passage whereas line 2 – downstream of the retaining valve – is connected to the airbox via the throttle valve. Line 3 links line 2 to the airbox when the throttle valve opens to an angle greater than 10-12 degrees.

During deceleration, the system configuration is as shown in the figure.

The negative pressure in the intake passages is transmitted to the clutch membrane via line 1+2.

The ‘retaining’ valve (non-return) comes into play and stabilises the pressure in the line.

Consequently, the clutch discs slip and reduce the torque.

During acceleration (throttle valve >12°), the valve, connected on the throttle unit axis, links up line 2 with the airbox, thus cancelling out the pressing effect on the clutch unit and taking the clutch pack back to its original position.
</blockquote>

Transalp Engine Swaps

Jeff — Thu, 04 Jun 2026 21:44:00 GMT

Rotax V990/Aprilia 1000

← Older revision		Revision as of 21:44, 4 June 2026
(One intermediate revision by the same user not shown)
Line 67:		Line 67:
	[https://advrider.com/f/threads/show-us-your-transalp-modifications.39170/page-1139#post-44009595 Additional information from Skyliner about the clutch, firing order, cylinder heads, and exhaust] (Feb 20, 2022). [https://www.advrider.com/f/threads/show-us-your-transalp-modifications.39170/page-1140#post-44011197 This post] covers cooling plumbing and FCR carburetors.		[https://advrider.com/f/threads/show-us-your-transalp-modifications.39170/page-1139#post-44009595 Additional information from Skyliner about the clutch, firing order, cylinder heads, and exhaust] (Feb 20, 2022). [https://www.advrider.com/f/threads/show-us-your-transalp-modifications.39170/page-1140#post-44011197 This post] covers cooling plumbing and FCR carburetors.

	== ~~Aprilia/~~Rotax V990 ==		== Rotax V990/Aprilia 1000 ==

			Additional Rotax V990 details are on the [[Rotax V990]] page.

	The Rotax V990 engine used in various Aprilia 1000 models might conceivably be made to fit into the Transalp frame. If so, it will definitely require custom mounting brackets, and may require the complete removal of the lower cradle from the frame. Aprilia uses the Rotax engine is a stressed member.		The Rotax V990 engine used in various Aprilia 1000 models might conceivably be made to fit into the Transalp frame. If so, it will definitely require custom mounting brackets, and may require the complete removal of the lower cradle from the frame. Aprilia uses the Rotax engine is a stressed member.
Line 129:		Line 131:
	* Shift drum rotated 180 degrees		* Shift drum rotated 180 degrees
	</blockquote>		</blockquote>

			The ETV1000 Caponord used 47mm throttle bodies. The SL1000 Falco, RST1000 Futura, and 2002-2005 Tuono used 51mm throttle bodies. The 2006-2009 and 2004-2009 RSV1000 used 57mm throttle bodies.

	=EFI Conversion=		=EFI Conversion=