how can i tell if this old do a standard motorcycle spark plug hole 250 cc yamaha motor

You need to find the thread diameter size of your spark plug. Look up what NGK plug will work for your bike and then check this site: https://www.math.uwaterloo.ca/~rblander/NGK.txt Field one of the NGK code is thread diameter size. Then get the appropriate helicoil kit. Remove the head before drilling out and repairing the threads or you will get metal shavings in your cylinder and ruin your engine.

is Inserts stainless steel or steel ?

They are made from Chrome Vanadium Steel. I’ve used my set several times now and it’s a decent quality kit.

Can you supply me with a kit for my stihl chainsaw ms 251 spark plug ?? plug # ngk cmr6h !!

No, I purchased this product, this is not how you contact the seller.

Are the Helicoil made out of Stainless steel?

chrome vanadium, like many hand tools, such as wrenches.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Metric Helicoil Thread Repair Kit: 131-Piece Heli Coil HSS Drills Inserts Taps & Tools M5 M6 M8 M10 M12 Automotive Engine Spark Plug Cylinder Insertion Rethreading Tools Universal Rethread Restorer

Product ID: 116793808

🔩131-piece pro-grade set

🧰durable steel carry case

⚙️HSS drills & taps precision

363.84 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Fix it like a pro, every time — don’t let stripped threads slow you down!

ORGANIZED ON THE GO - Compact steel case keeps your toolkit ready wherever the job calls.
EFFORTLESS PRECISION - User-friendly design makes rethreading seamless for pros and DIYers alike.
PRO GRADE DURABILITY - High-speed steel drills and taps engineered for long-lasting performance.
COMPLETE THREAD REVIVAL - Restore stripped threads with 131 precision tools for M5 to M12 sizes.
VERSATILE AUTOMOTIVE ESSENTIAL - Perfect for spark plugs, engine bolts, and universal thread repairs.

The Metric Helicoil Thread Repair Kit is a premium 131-piece set featuring high-speed steel drills, taps, and inserts designed to restore stripped or damaged internal threads from M5 to M12 sizes. Ideal for automotive and engine repairs, it combines professional-grade durability with user-friendly tools, all housed in a rugged steel carrying case for ultimate portability and organization.

Specifications

ASIN	B07MZQK1HP
Best Sellers Rank	#3,518 in Automotive ( See Top 100 in Automotive ) #2 in Thread Metric Inserts & Repair Kits
Brand	SEDY
Customer Reviews	4.5 4.5 out of 5 stars (1,154)
Date First Available	January 21, 2019
Item Weight	4.71 pounds
Item model number	13
Manufacturer	SEDY
Manufacturer Part Number	T97381
Model	T97381
Product Dimensions	15 x 1.6 x 7.9 inches

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