2021/06/21
MODEL ITEM NUMBER
80458
R80458 PAGE 1/9
INSTRUCTION
＊Be sure to read and understand the contents before installing the product and use it properly.
＊Please keep this instruction manual in a safe place so that you can take it out and read it at any time.
＊When transferring this product or the vehicle on which this product is installed to a third party, be sure to also hand over this instruction manual.
DT125 Engine
(Narrow Pitch)
Finger-Follower DOHC 4Valve CylinderHead
UPGRADE KIT
Thank you for purchasing DAYTONA’s product. Please read this instruction manual carefully before using this product.
Be sure to check the contents of the product before installation.
If you notice any problem, please contact the dealer where you purchased the product.
■Please read the following before the installation.■
We are not responsible for any accident or damage caused by using the product without following the precautions in the instruction manual.
Indicates a potentially hazardous situation which, if not avoided, could result in personal injury
or property damage.
Indicates a potentially hazardous situation that, if not avoided, could result in death or serious injury.
Warning
！
Caution
！
If you are technically unskilled or inexperienced, leave the work to an experienced store or mechanic.
Improper installation due to inexperienced skills or lack of knowledge may result in damage to parts or accidents.
Do not run the engine for long periods of time in poorly ventilated areas.
Doing so may result in carbon monoxide poisoning.
Gasoline is extremely flammable, so keep the work area away from fire.
Evaporated gasoline may cause an explosion, so work in a well-ventilated area.
After having installed the new parts, place check each part installed and tighten all nuts, bolts and screws
after having ridden 100km. Regular inspection of parts should be done on every 500km.
If anything unusual happens while test riding, stop at a safe place and check engine parts.
The installing of this kit requires jacking up your motorcycle and must be done under trained hands.
Inadequate safety precautions and professional help could result in serious injury.
Prepare appropriate tools and work equipment to avoid damage or injury to parts.
When working on the engine and muffler, be sure to do so when they are cool.
Doing so while the engine and muffler are hot may result in burns.
Be sure to install an oil cooler and oil temperature gauge to control the oil temperature.(Keep under 110degree C)
Continuous running at high temperatures may damage the engine.
This product has some related parts required.
In this manual, the installation procedure is omitted for related parts products. Please note.
The price and specifications of this product are subject to change without notice.
The same applies to the products introduced in the text. Please note.
For spark plugs, use the specified product, NGK ER8EH.
Be sure to use high-octane gasoline. Regular gasoline cannot be used because of the high compression engine.
Check and maintain the oil pump and the strainer (wire mesh) at the bottom of the pump.
Avoid sudden engine braking by downshifting.
In the worst case, this will result in damage to the crankshaft and engine.
■ Features ■
Completely revised DOHC 4-valve cylinder head
Adopted finger follower rocker arms
Port geometry designed to increase intake volume and velocity
Ceramic coated all aluminum cylinder
Forged 2-ring piston, crankshaft with long connecting-rod
DLC coated piston pin
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