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MS 661 C-M Petrol Chainsaw
SKU: Stihl | MS-1144 200 0006
- Regular price
- £1,244.54 Ex VAT
- £1,493.45 Inc VAT
- RRP: £1,464.17 Ex VAT
- Sale price
- £1,244.54 £1,244.54 Ex VAT
- Regular price
-
- £1,493.45 £1,493.45 Inc VAT
Free Delivery Over £75 *
Worldwide Shipping from the UK
Trusted UK Arborist Retailer
30-Day Easy Returns
STIHL Approved Dealer
As a STIHL Approved Dealer, we supply genuine UK-spec machines with full manufacturer warranty, professional preparation, and expert aftersales support.
Product information & specifications
STIHL MS 661 C-M Petrol Chainsaw – Magnum Power for Professional Forestry
Free Spare Chain Available
Worth £20–£40 depending on model
When you add this STIHL chainsaw to your cart, your free matching chain will appear automatically. Simply click "Add Free Item" in the cart to include it with your order.
- Matching chain for this model
- Ideal for quick swaps on the job
- Helps reduce downtime
Your free chain will appear in the cart — just click "Add Free Item" before checkout.
The STIHL MS 661 C-M is one of STIHL's most powerful production chainsaws, built for large-scale felling, heavy timber processing and demanding commercial forestry operations. A 91.1cc 2-MIX engine produces 5.4 kW (7.3 hp) at 7.5 kg without bar and chain, with M-Tronic electronic engine management delivering consistent power across all conditions. Bar lengths from 50–90 cm (20–36") make the MS 661 the right choice for large-diameter timber where the MS 462 or MS 500i reach their limits. In stock at Gustharts as an authorised STIHL dealer, with free UK delivery over £75.
Key Features
- 91.1cc 2-MIX Engine, 5.4 kW / 7.3 hp – Formidable cutting performance with notable reductions in fuel use and emissions versus conventional 2-stroke design.
- STIHL M-Tronic Engine Management – Automatically adjusts timing and fuel mix for peak performance across temperature, altitude and fuel quality variations.
- 7.5 kg Without Bar and Chain – Substantial but manageable for a 91cc professional saw; power-to-weight ratio of 1.4 kg/kW.
- Bar Compatibility: 50–90 cm (20–36") – Covers large-diameter felling through to timber processing with appropriate bar selection.
- HD2 Washable Air Filter – Long-life pre-separation filter for dusty forestry environments with reduced maintenance frequency.
- Ematic Oil Lubrication System – Reduces bar oil consumption by up to 50% with precision demand-led delivery.
- ElastoStart and Manual Decompression Valve – Reduced starting effort and starter protection.
- Anti-Vibration System – Advanced vibration dampening for extended shifts on large timber.
- Side-Mounted Chain Tensioner and Tool-Free Caps – Fast chain adjustments and refuelling without tools.
Technical Specifications
Why Choose the STIHL MS 661 C-M?
The MS 661 C-M occupies the position between the MS 500i and the MS 881 Magnum in the STIHL forestry range. At 91.1cc it delivers substantially more torque than the MS 500i for large-diameter felling without reaching the extreme weight of the MS 881 at 9.9 kg. For contractors working old-growth timber, large softwoods or hardwoods where bar lengths above 60 cm are regularly needed, the MS 661 C-M is the practical choice. M-Tronic delivers reliable performance without carburettor adjustment even at altitude or in cold conditions.
Complete Your Kit
- Replacement Chainsaw Chains – ⅜" RS chains compatible with the MS 661 C-M
- Chainsaw Guide Bars – 50–90 cm bars for this model
- 2-Stroke Oil and Fuel – STIHL HP Ultra and MotoMix for 2-MIX engines
- Chain Sharpening Tools – filing kits and bench sharpeners for ⅜" RS chain
- Forestry PPE – chainsaw trousers, helmets, gloves and boots for compliant felling work
FAQs
How does the MS 661 C-M compare to the MS 500i?
The MS 661 C-M is larger at 91.1cc versus 79.2cc, producing 5.4 kW versus 5.0 kW, and weighs 7.5 kg versus 6.3 kg. The MS 661 is the better choice for consistently large-diameter timber; the MS 500i offers better weight and fuel injection technology for mixed forestry work.
What bar lengths does the MS 661 C-M accept?
STIHL recommend 50–90 cm (20–36") guide bars with ⅜" RS chain. Gustharts stocks compatible bars and chains.
Is the MS 661 C-M suitable for chainsaw milling?
Yes — with bar options up to 90 cm and strong sustained torque it is well suited to Alaskan mill and portable sawmill setups for large log processing.
Does the MS 661 C-M have a heated handle option?
No — the MS 661 C-M does not have a heated handle variant. For cold-climate forestry work with heated handles, the MS 261 C-M VW and MS 500i W are the available STIHL options.
How does M-Tronic work on the MS 661 C-M?
M-Tronic continuously monitors and adjusts ignition timing and fuel delivery electronically, removing the need for manual carburettor tuning in the field across varying temperatures, altitudes and fuel conditions.
Specification
| Bar length | 71-90 cm |
| Bar length | 28-36 " |
| Displacement | 91.1 cm³ |
| Power output | 5.4/7.3 kW/HP |
| Weight | 7.5 kg 1) |
| Power-to-weight ratio | 1.4 kg/kW |
| Weight | 9.22 / 10.38 kg 2) |
| Length with bumper strike | 467 mm |
| Sound pressure level | 105 dB(A) 3) |
| Sound power level | 118 dB(A) 3) |
| Vibration values left/right | 6.9/5.6 m/s² 4) |
| Saw chain pitch | 3/8 " |
| CO2 | 679 g/kWh |
1)Without fuel, without bar and chain2)Without fuel, with bar and chain3)K-factor according to DIR 2006/42/EC = 2.5 dB (A)4)K-factor according to DIR 2006/42/EC = 2m / s ²
STIHL MS 661 C-M Petrol Chainsaw – Magnum Power for Professional Forestry
Free Spare Chain Available
Worth £20–£40 depending on model
When you add this STIHL chainsaw to your cart, your free matching chain will appear automatically. Simply click "Add Free Item" in the cart to include it with your order.
- Matching chain for this model
- Ideal for quick swaps on the job
- Helps reduce downtime
Your free chain will appear in the cart — just click "Add Free Item" before checkout.
The STIHL MS 661 C-M is one of STIHL's most powerful production chainsaws, built for large-scale felling, heavy timber processing and demanding commercial forestry operations. A 91.1cc 2-MIX engine produces 5.4 kW (7.3 hp) at 7.5 kg without bar and chain, with M-Tronic electronic engine management delivering consistent power across all conditions. Bar lengths from 50–90 cm (20–36") make the MS 661 the right choice for large-diameter timber where the MS 462 or MS 500i reach their limits. In stock at Gustharts as an authorised STIHL dealer, with free UK delivery over £75.
Key Features
- 91.1cc 2-MIX Engine, 5.4 kW / 7.3 hp – Formidable cutting performance with notable reductions in fuel use and emissions versus conventional 2-stroke design.
- STIHL M-Tronic Engine Management – Automatically adjusts timing and fuel mix for peak performance across temperature, altitude and fuel quality variations.
- 7.5 kg Without Bar and Chain – Substantial but manageable for a 91cc professional saw; power-to-weight ratio of 1.4 kg/kW.
- Bar Compatibility: 50–90 cm (20–36") – Covers large-diameter felling through to timber processing with appropriate bar selection.
- HD2 Washable Air Filter – Long-life pre-separation filter for dusty forestry environments with reduced maintenance frequency.
- Ematic Oil Lubrication System – Reduces bar oil consumption by up to 50% with precision demand-led delivery.
- ElastoStart and Manual Decompression Valve – Reduced starting effort and starter protection.
- Anti-Vibration System – Advanced vibration dampening for extended shifts on large timber.
- Side-Mounted Chain Tensioner and Tool-Free Caps – Fast chain adjustments and refuelling without tools.
Technical Specifications
Why Choose the STIHL MS 661 C-M?
The MS 661 C-M occupies the position between the MS 500i and the MS 881 Magnum in the STIHL forestry range. At 91.1cc it delivers substantially more torque than the MS 500i for large-diameter felling without reaching the extreme weight of the MS 881 at 9.9 kg. For contractors working old-growth timber, large softwoods or hardwoods where bar lengths above 60 cm are regularly needed, the MS 661 C-M is the practical choice. M-Tronic delivers reliable performance without carburettor adjustment even at altitude or in cold conditions.
Complete Your Kit
- Replacement Chainsaw Chains – ⅜" RS chains compatible with the MS 661 C-M
- Chainsaw Guide Bars – 50–90 cm bars for this model
- 2-Stroke Oil and Fuel – STIHL HP Ultra and MotoMix for 2-MIX engines
- Chain Sharpening Tools – filing kits and bench sharpeners for ⅜" RS chain
- Forestry PPE – chainsaw trousers, helmets, gloves and boots for compliant felling work
FAQs
How does the MS 661 C-M compare to the MS 500i?
The MS 661 C-M is larger at 91.1cc versus 79.2cc, producing 5.4 kW versus 5.0 kW, and weighs 7.5 kg versus 6.3 kg. The MS 661 is the better choice for consistently large-diameter timber; the MS 500i offers better weight and fuel injection technology for mixed forestry work.
What bar lengths does the MS 661 C-M accept?
STIHL recommend 50–90 cm (20–36") guide bars with ⅜" RS chain. Gustharts stocks compatible bars and chains.
Is the MS 661 C-M suitable for chainsaw milling?
Yes — with bar options up to 90 cm and strong sustained torque it is well suited to Alaskan mill and portable sawmill setups for large log processing.
Does the MS 661 C-M have a heated handle option?
No — the MS 661 C-M does not have a heated handle variant. For cold-climate forestry work with heated handles, the MS 261 C-M VW and MS 500i W are the available STIHL options.
How does M-Tronic work on the MS 661 C-M?
M-Tronic continuously monitors and adjusts ignition timing and fuel delivery electronically, removing the need for manual carburettor tuning in the field across varying temperatures, altitudes and fuel conditions.
Specification
| Bar length | 71-90 cm |
| Bar length | 28-36 " |
| Displacement | 91.1 cm³ |
| Power output | 5.4/7.3 kW/HP |
| Weight | 7.5 kg 1) |
| Power-to-weight ratio | 1.4 kg/kW |
| Weight | 9.22 / 10.38 kg 2) |
| Length with bumper strike | 467 mm |
| Sound pressure level | 105 dB(A) 3) |
| Sound power level | 118 dB(A) 3) |
| Vibration values left/right | 6.9/5.6 m/s² 4) |
| Saw chain pitch | 3/8 " |
| CO2 | 679 g/kWh |
1)Without fuel, without bar and chain2)Without fuel, with bar and chain3)K-factor according to DIR 2006/42/EC = 2.5 dB (A)4)K-factor according to DIR 2006/42/EC = 2m / s ²
STIHL Warranty
STIHL offer a 1 year professional warranty or 2 year domestic warranty with all of their machines.
The following exceptions apply:
- AK System, AS System and AI Line cordless products aren't covered under warranty when used by professionals
- AP System machines, batteries and chargers - 2 year professional warranty
- Pressure washers - 2 year professional warranty or 3 year domestic warranty
- Mowers, tillers, shredders, scarifiers & iMOW machines - See STIHL's website here
Extend your Stihl warranty by an additional year when purchasing a STIHL Smart Connector with selected machinery from the petrol and cordless range. Extends your petrol warranty from 1 to 2 years AND 2 to 3 years on select cordless tools.
STIHL offer a 1 year professional warranty or 2 year domestic warranty with all of their machines.
The following exceptions apply:
- AK System, AS System and AI Line cordless products aren't covered under warranty when used by professionals
- AP System machines, batteries and chargers - 2 year professional warranty
- Pressure washers - 2 year professional warranty or 3 year domestic warranty
- Mowers, tillers, shredders, scarifiers & iMOW machines - See STIHL's website here
Extend your Stihl warranty by an additional year when purchasing a STIHL Smart Connector with selected machinery from the petrol and cordless range. Extends your petrol warranty from 1 to 2 years AND 2 to 3 years on select cordless tools.
Delivery & Returns
UK Delivery
Fast, reliable delivery from our UK warehouse.
- Free UK delivery on eligible orders over £75 +VAT. Long, heavy or oversized items may incur an additional delivery charge, shown at checkout.
- UK Standard Delivery from £3.60 + VAT
Estimated delivery: 2–4 working days - Next Working Day Delivery – £6.00 + VAT
Order before 3:00pm (Monday–Friday) for next working day delivery
All UK orders are dispatched Monday–Friday and sent via a tracked courier service.
International Delivery
We ship worldwide from the UK.
- Europe from £10.00
Estimated delivery: 2–7 working days - Rest of the World from £12.00
Estimated delivery: 2–11 working days
Shipping costs and delivery times are calculated at checkout based on destination and order contents.
Customs, Duties & Taxes
International orders may be subject to local import duties, taxes, or customs charges.
When UPS is selected at checkout, applicable duties and taxes are included in the total price. For other shipping services, duties and taxes may be charged separately on delivery and are the responsibility of the recipient.
Customs processing times may affect delivery estimates.
Returns
30-Day Return Policy
- Items can be returned within 30 days of delivery
- Products must be unused and in original condition
- Return postage costs apply unless the item is faulty or incorrect
For full details, please visit our Shipping & Returns page.
UK Delivery
Fast, reliable delivery from our UK warehouse.
- Free UK delivery on eligible orders over £75 +VAT. Long, heavy or oversized items may incur an additional delivery charge, shown at checkout.
- UK Standard Delivery from £3.60 + VAT
Estimated delivery: 2–4 working days - Next Working Day Delivery – £6.00 + VAT
Order before 3:00pm (Monday–Friday) for next working day delivery
All UK orders are dispatched Monday–Friday and sent via a tracked courier service.
International Delivery
We ship worldwide from the UK.
- Europe from £10.00
Estimated delivery: 2–7 working days - Rest of the World from £12.00
Estimated delivery: 2–11 working days
Shipping costs and delivery times are calculated at checkout based on destination and order contents.
Customs, Duties & Taxes
International orders may be subject to local import duties, taxes, or customs charges.
When UPS is selected at checkout, applicable duties and taxes are included in the total price. For other shipping services, duties and taxes may be charged separately on delivery and are the responsibility of the recipient.
Customs processing times may affect delivery estimates.
Returns
30-Day Return Policy
- Items can be returned within 30 days of delivery
- Products must be unused and in original condition
- Return postage costs apply unless the item is faulty or incorrect
For full details, please visit our Shipping & Returns page.
