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Honda MTX 125 restriction

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Cuz
Derestricted Danger



Joined: 11 Jun 2012
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PostPosted: 18:07 - 11 Jun 2012    Post subject: Honda MTX 125 restriction Reply with quote
Hi, I've got a 1989 Honda MTX 125. For some reason in 6th gear it is restricted to 30mph. Does anyone know the cause/fix?

Any help would be appreciated, Thanks.
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 18:48 - 11 Jun 2012    Post subject: Reply with quote
Hi

No standard reason for that.

UK ones were restricted to 9kW (~12hp), by missing off the power valve setup (not really possibly to retrofit without a lot of work) and by the exhaust. But nothing to limit speed beyond the power.

All the best

Keith
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Cuz
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Joined: 11 Jun 2012
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PostPosted: 18:58 - 11 Jun 2012    Post subject: Reply with quote
How can I change the power valve? Cheers.
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Usher4566
Spanner Monkey



Joined: 29 Apr 2011
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PostPosted: 19:07 - 11 Jun 2012    Post subject: Reply with quote
U meen it only goes 30?
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Cuz
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Joined: 11 Jun 2012
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PostPosted: 19:13 - 11 Jun 2012    Post subject: Reply with quote
In 5th it'll go past 30, but in 6th it will stick at 30
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 19:35 - 11 Jun 2012    Post subject: Reply with quote
Cuz wrote:
How can I change the power valve? Cheers.


Simplest way, buy a complete engine from a full power (ie, non UK). Probably the cheapest way as well.

To do it to a UK engine, you would need a full power barrel, or some machining work on the existing barrel to remove the cast in plug for the power valve. Also need the valve and linkage down to the clutch cover, and a full power clutch cover or a modified clutch cover.

The basic drive parts new from Honda (using https://www.cmsnl.com )

Spindle,herp - € 32.00
Pl,herp Arm Guide - € 3.00
Collar,herp Arm - € 4.00
Spg,herp Arm Set - € 3.50
Gide herp Spindle - € 18.50
Arm,herp Comp. - € 5.00
Guide,valve - € 14.50
Valve herp - € 13.50
Retainer,valve - € 6.00
Collar - € 3.50
Cover,herp Valve - € 5.50
Cotter, Valve - € 2.00
Clip,oil Tube - € 2.50
Nut, Tappet. - € 1.50
Wash,thrust,5.5mm - € 1.00
Wash,seal 20x25 - € 1.00
Oil Seal - € 3.00
Oil.seal.5.5x11x4 - € 3.00
O-ring,178x24 - € 2.00
Nut,flange,6mm - € 1.00

That is ~€126 for the minor bits (some of which no longer seem to be available).

If you can't modify the clutch cover and barrel then they are €212.50 and €445.50 respectively.

How far beyond 30 will it go in 5th? Would expect it to manage 60+mph in 5th if healthy.

All the best

Keith
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Old Thread Alert!

The last post was made 14 years, 22 days ago. Instead of replying here, would creating a new thread be more useful?
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