FINISH LINE ENGINES

Finish Line Engines LLC For all your motorcycle ,snowmobile and Atv needs ! We offer complete engine rebuilds - eric-gorr.com big bore kits - cylinder flow testing - Dyno test and tuning - and a whole lot more !

2 Stroke Service's

SERVICE MASTER LIST FOR
2-STROKE ENGINES

2-stroke engines in Japanese and Euro dirt bikes 1969-2016

CYLINDER HEAD MODS $60


This service includes all machining modifications per situation and application. Services include gasket surfacing, turning, clearance-machining for big bores and or strokers, flat-top piston conversions as well as hemi and conical dome shaping, lowering compression for low octane pump gas with ethanol, raising compression for high altitude, TIG-welding, o-ring groove cutting, plug-hole turning and threading. Send the cylinder head for service.

 

POWER VALVE SERVICE $70


Power valves are built into the cylinder around the exhaust port. They’re supposed to make the exhaust port bigger when you twist the throttle open. Power valves are complicated mechanisms prone to failure. We know what parts break and we usually stock them. We offer a service to clean, inspect, and adjust the power valves. This service comes standard with all porting and big bore packages. Send the complete top end assembly for service.

 

CYLINDER BASE and HEAD MACHINING $75


Cylinder head and cylinder bases can be turned and machined to produce a power band that is better for beginners and trail-riders. The technical reasoning is that this modification serves to retard the port timing and increase the squish velocity produced in the cylinder head. If you just want more low-end power and don’t want to spend a fortune, this is the best mod that will give you the biggest bang for your buck! Includes light diamond honing to ready the bore for new piston and rings. Send the complete top end assembly for service.

 

CYLINDER PLATING/ POWER VALVE SERVICE (aluminum cylinders) $275


Most modern dirt bikes use hard coatings applied directly to the aluminum cylinder bore. Nickel-composite plating is the hardest low friction coating available. We can plate a cylinder back to original size or to a big bore size for no extra charge. 1-Year warranty This service includes cylinder head resurfacing, stud removal and thread repair, and power valveservice and assembly on applicable models. Send the complete top end assembly for service.

 

CYLINDER PLATING (iron cylinders) $282


This service is especially great for vintage cylinders with cast iron sleeved bores and CR500s. It is designed to preserve the bore at a particular size. Nickel-composite coating that is very hard and long wearing and comes with a 1-year warranty. Send the complete top end assembly for service.

 

BORING and HONING for iron-lined cylinders $60


This service includes cleaning, boring, diamond-honing, port chamfering, exhaust bridge relieving and polishing. We offer Wiseco, Pro-X, JE, Athena, Magnum, and Vertex piston kits as well as generic gaskets and bearings. Send the complete top end assembly for service.

 

2-STROKE PORTING For Japanese and Euro dirt bikes 1990+


All 2-stroke porting packages include the following; dis assembly and cleaning of all the top end components, complete porting and polishing, cylinder head machining, base machining, diamond honing, baking soda blasting, power valve service or epoxy-filling, power valve assembly and timing of applicable models.

 

50cc AUTO BIKES $75


Cobra, KTM, Polini; cylinder porting with head mods to push the limit for advanced riders.

 

65-112cc MINIS $125


Your choice of porting for powerbands that work best for beginner and trail riders as well as national caliber experts in Supermini classes.

 

125-200cc BIG BIKES $195


Three powerband choices of more low to mid-range, more mid to top end or a smoother broader powerband, plus all of the services listed above.

 

SCHOOLBOY/JUNIOR NATIONAL LEVEL MX 125 PORTING $195
This service includes cylinder porting and race-ready honing to a new OEM cylinder. You can supply your cylinder for porting or we can sell you a brand new cylinder for 20% off of retail.
The porting powerband choices include stadium (low&mid hit) and outdoor (mid-top). Head mods and powervalve service included.

SHIFTER KARTS $195


What a sick twisted form of racing! G-Forces that will give you kidney failure and the ability to cut lap times faster than an Indy car! Our package offers a wide range of services ranging from cloning old cylinders to setting up specs for mx class and IC engines and even clay-oval outlaw racing.
We perform cylinder porting and matching head mods, along with diamond honing of the bore for only $195.

 

CLONE PORTING $195


Racers are a superstitious bunch and if you have a cylinder that is trashed and you need a new one cloned to the old one for good luck sake,  We can fulfill your wish. Send the old cylinder and a new one, blueprints or drawings are OK too if the old cylinder is destroyed.

 

VINTAGE PORTING $185 For Japanese and Euro dirt bikes 1969-89


The vintage mx market is growing rapidly and former barn junkers are becoming expensive collectibles with a lot of rewarding hard work. Racers are prepping spare bikes for VMX and AHRMA events in the US and in countries like Australia, England, and Belgium vintage mx is the biggest class in racing.

250-550cc BIG BIKES $225

Three powerband choices of more low to mid-range, more mid to top end or a smoother broader powerband, plus all of the services listed above.

 

HONDA CR500 PORTING $225


The porting package on the CR500 includes cylinder porting, manifold matching and polishing, epoxy porting, soda-blast cleaning, and diamond honing to the next oversize if needed for $225 Additional parts options include your choice of pistons from Wiseco Pro-Lite, Vertex, and Pro-X piston kits , Cometic stainless steel gaskets , and top end bearings. All aftermarket parts are 20% off. 

 

BIG BORE KITS 50-550cc 2-STROKES

For model applications check the Big Bore Masterlist

All packages include

Cleaning and disassembly
Inspection and measurement
Over-boring
Porting
Replating with nickel silicon-carbide composite plating
Diamond honing
Head mods
Powervalve service
Piston, gasket kits, and top end needle bearing.
You’ll get your choice of powerbands; more low/mid, more mid/top, broader powerband, and choices of fuel; pump or race gas.
Powervalve timing and assembly
Wiseco top end assembly with piston, bear, gaskets, alignment pins, & seals.
Piston check with ring end gapping
Cylinder bore “break-in finish”, no safety measures needed, just ride!
Backed up by a 1-year warranty on the plating and free updates to the porting and diamond honing. Send the complete top end assembly for service.

AVERAGE PRICES: US Dollars
50-72cc $350
73-112cc $400
124-144cc $500
250-300cc $660
325-550cc $660

BOTTOM END ENGINE REBUILDING SERVICES

Individual and all-inclusive services related to the whole engine or just the components of the crankcase.

CRANKSHAFT REBUILDING $75

Includes cleaning, disassembly, polishing of critical surfaces, rod pressing in an RCE crankshaft jig, and truing. Rod kit extra $80-300. Send the crankshaft assembly for service.

CRANKSHAFT STROKING $350

Includes the same work as rebuilding and relocation of the big end pinhole to change the stroke length of the crankshaft. Rod kit extra $80-300. Requires crankcase boring/porting, and head mods to accommodate the crankshaft stroke change. Send the crankshaft assembly for service.

CRANKCASE BORING/PORTING $100

This service is used in conjunction with big bore stroker mods. Each case half is bored at the center surface to accommodate the clearance of the stroker connecting rod. Then each case half is match-ported to the cylinder and make clearance for the big bore piston skirt. Send the crankcases and cylinder, plus dimensions on the stroker crank.

ENGINE DISASSEMBLY AND ASSEMBLY $300

This service includes internal flushing and exterior baking-soda blast-cleaning and works into disassembly, clean & inspect, precision measuring, and a detailed estimate with performance and durability options like bearings, clutch baskets, cranks, OE parts. Parts are extra. No warranty is included on used dirt bike engine service. Send the complete engine except carb, for service.

 

ALL INTERNATIONAL ORDERS GET OUR RUSH SERVICE FOR FREE!

 

Finish Line Engines LLC

431 Madison St

Beaver Dam Wi 53916

Tel * 1(920)382-2897