Going to try the new Hummer G4

[Avalanx]

Puzey XTR

Hi guys,

I am South African and have information on the Puzey MX bikes that you may find useful. The XTR is dezigned by Mike Puzey an exceptionally talented engineer whom has over 20 international patents and has been engineering motorised equipment from a young age.
The Puzey XTR 250 f1 (the version currently available)
it has a 250cc Loncin motor, 2valves, aircooled. This produces around 17hp which a rather average but has proven to be adequate for trail biking. However a new version the XTR 2f is being released near October which will be far more capable with a 250cc 4-stroke motor with 26hp and a chassis similar to that of the crf450x.
The new bike sounds quite promising and so is the whole range of MX bikes, but they are produced in China so the thaught of poor reliable is indeed provoked. Anyway just chck it out it seems to be quite a good buy, I have ordered the MX version of the XTR 2f myself.

Cheers

 

[XLR8]

Thanks Rodbox5 for the info,

I really only use the bike for a bit of trail type riding.
I am 36 and 80kgs so it doesnt really have to work all that hard
I have no intention of being the next Chad Reed. lol
So a full race spec engine wasnt really my intention.
I was just aiming to get this engine purring.
The bike runs fine just pops a bit up top at full throttle (was thinking the rev limited cdi might be the issue) It could also be a burnt valve. Will order a head gasket from Elstars and take a look. (any suggestions on torque settings for the head bolts ??)
I have been through and cleaned the carby and adjusted the jet needle and modified the air cleaner as suggested.
A mate of mine has a 140cc lifan powered pit bike which was running quite well but he bought and fitted a similar "Performance CDI" He did have to adjust the carby to run a little richer but the bike has gained a noticable amount of power.
I had thought that it may be possible to adjust the timing of the "Spark" slightly (like turning the distributor in a car) not the valve timing as I can imagine that would only be possible via the cam.

As for the manual,
I rang Elstars and they assured me that there will be a PDF up online in the next few weeks which should be an assembly manual for the Zongshen engine. I can only hope It seems as though China is afraid that someone may copy their copy of an engine. LOL

Cheers and Beers

 

[rodbox5]

Hmm - difficult to say XLR8.

If the CDI is just putting out a stronger pulse, then a little custom tuning might do the trick - but if the timing of the spark is advanced, it wont suit your bike in the standard configuration (as mentioned before).

The trouble with the Chinese add-on parts is that they don't really explain what you're getting and there's little in the way of installation guides and product specs to help.

That's why I tend to be conservative and go for things I know will improve performance without altering the set-up of the engine. A typical example of this is opening up the snorkel port on the air-box to free up air flow. This type of mod makes a noticable difference, but doesn't require re-jetting or any other messing about.

Another thing you can always do, is take the bike in for a tune-up at a specialist, who has all the right analysis kit (or even a dyno-tune set-up). It doesn't cost that much and will gernerally get you an extra horse or two.

If my bike keeps going O.K, I'm looking to get a bataycan stage 3 race engine next year. That way, the mod company will have done all the hard work for me and custom matched the upgrade components for optimum performance.

Can't wait to do it!

 

[rodbox5]

I want to pick up a spare rear shock for the Hummer, so that I have a one to use whilst I source components & service the other.

Dreamrider are out of stock and Atomik don't answer their mail - anybody got one for sale?

 

[Johny#1]

Gday fellas

Went for a ride today the bike went great and i had no major problems except for one little problem one of the foot pegs like moved downwards so it was like nearly verical just wondering if you know how to fix it. Im not very good with motorbikes.

 

[rodbox5]

Gday fellas

Went for a ride today the bike went great and i had no major problems except for one little problem one of the foot pegs like moved downwards so it was like nearly verical just wondering if you know how to fix it. Im not very good with motorbikes.

Hi Johny,

If you hit something big-time and bent your footrest, you will need to get some heat on it to straighten it out. Just banging it with a hammer will weaken the peg/bracket.

If the peg bent just going over a jump or something and just had you're weight on it - you need to find a better quality replacement foot-peg big time.

There are plenty of after market pegs available on e-bay - you just need to drop them a line and ask if the pegs advertized fit your bike.

Busted pegs are scary - err on the side of caution!

 

[Johny#1]

The foot peg doesnt look bent it just looks like the spring in it is loose and it has moved downwards.

 

[rodbox5]

Hi Johnny,

The footpeg is supposed to move upwards in case of impact and the spring is supposed to return it to the normal (horizontal) position. If your footpeg points down, then the locking tab has probably broken off and you'll have to replace the peg.

You should be able to source a replacement from where you purchased the bike - or from an after-market seller on e-bay.

 

[rodbox5]

As an after-though Johny - it may be a tab on the foot-peg support bracket which has failed - in which case you need to replace the bracket.

In either case, if you inspect the peg and bracket carefully, you should see a rough edge if somethings broken off.

Good luck with the fix.

 

[rodbox5]

Spares at a good price

Hey guys,

You should start stocking up on cheap spares for the Hummer whilst they last!

For the G4 Hummer/Kuda Pro owners, good quality clutches are available for penuts from Dreamrider:
eBay Australia Shop - Dreamrider Store: T2900, SPARE PARTS, Kegerator

Replacement Hummer wheels are available at a steal from Get Fit:

eBay Shop - 1GETFIT: Motorcycle Parts: PERFORMANCE DIRT BIKE ENGINE REBUILD Piston Parts MP044

I've bought a couple of sets of wheels so I can fix them up with different tyres and sprocket gearings - the only problem is getting hold of the disk rotors and sprocket bolt locking plates.

If anybody knows where to get either - please chirp up!

 

[Johny#1]

Rod just wondering if these footpegs will fit my bike ( G4 hummer)
Alloy Foot Pegs Dirt Bike KDF Atomik DHZ Pitpro - eBay Other Makes, Bike Parts, Motorcycle Parts, Accessories, Cars, Bikes, Boats. (end time 29-Jul-08 20:00:00 AEST)

 

[rodbox5]

Hi Johny,
They look about right - but Atomik's previous model Kuda Pro was pretty much the exact same bike as the G4 Hummer - so if you dropped them a line and asked - I'm sure they could confirm that they fit.

 

[Johny#1]

Fixed the problem with the foot pegs rod just took one of the back pegs off that come with the bike and put it on the front. I reckon i will still by a new set tho.

 

[rodbox5]

Whatever works Johny1!

In the meantime don't pass up on an opportunity to buy spares. Chances are that the next version of the Hummer or Kuda will have a lot of non-compatible parts.

I've been buying spares at good prices lately including:

Clutches - $15, Wheels- $30, Carbies- $35, Rear Shock- $35, Complete front and rear brake systems- $50, Sprockets- $20

Take your time and source them at good prices - then store for a rainy day. It's just cool how little the spares cost! A guy at work paid more for his Triumph exhaust muffler that my whole bike cost - Why would you be into that?

 

[Linkavitch...]

Kx250

Hi everyone my name is ben and im 15,
At 187cm tall and weighing around 80kg, i thought a tomahawk kx might be too small, but when i bought one off ebay i saw that it was a rather large bike. The springs are a little too soft if your jumping, but since i only do trail riding with my mates and at my place i dont really notice. THese are the issues with the bikes...

Chain is too thin- get a DID 428 one or get a 520 guage, thats what im doing
the tires are good for hardpack but hit bottomless mud and you have to pratically try to hydroplane over it
It is easy to get water in the oil, either through the exhaust or the crankcase breather- this happened to mine, oil went all milky and the rings go stuck away from the bore- had to take the engine out and the top end apart. not fun

Apart from these issues these are great bikes. The frames are well welded and the engines great quality. When i took it apart it was about..40 hours old and it was not at all worn.
ONE KEY TIP- USE ONLY BIKE OIL..i use BP superbike 4. This is designed for bikes, the reason for not using car oil is that a car has a lot more oil, and it usually takes a long time to get around the engine. Since most cars are watercooled the oil will be cooler. so use bike oil.
Thats all for now ill write back when iver finished the mods..(bug my dad for some fat bars...)

Link

 

[rodbox5]

Welcome Linkavitch,

Your bike should come with a 428 chain as standard.

If you replace the Chinese chain with a good quality DID or RK chain - it should be plenty strong enough for your current engine set-up.

There are however companies like "Saturday Night Cycles", who supply hot engines for these bikes - and I believe they also provide 520 gauge sprocket upgrades to accommodate the extra power. If you really want to increase your chain gauge, I suggest you start with these guys.

You're the first guy I've heard from to get water in the oil on these bikes. It sounds like you may have drowned the bike at one point or another. It certainly does play hell with an engine - and I suspect the average China bike wouldn't have too many sophisticated design features to keep the water out.

Making sure the air box properly sealed is a must - but once the water goes above the air intake snorkel or the exhaust pipe - you've had it!

Well done on fixing things up however!

 

[rodbox5]

Just a quick update on the 250cc Link.

As you will recall, there was a lot that had to be done on this bike.

The concept was good - a 250cc OHC engine in a small light frame - set up to suit the smaller rider. The fit-out however was poor quality and a lot of parts had to be replaced, with the electrics and wiring needing the biggest fix.

Finally (with enough time and money) I got all the needed work done and took the bike out for a spin on the week-end. The effort was worth it - since I can report that the bike is super hot and surely fast enough to scare the pants off anybody. The only remaining problem is the suspension - which is not beefy enough to take the weight of the bike and a decent rider. Also, the forks have no adjustments - which doesn't help matters much.

If the bike continues to work well - I'll look at some after-market forks and shocks.

 

[Linkavitch...]

yeah im putting a 520 x-ring chain on, saturday night cycles is a good site, ordering a sprocket off there cause 15=41 is way too fast. this bike needs better tyres too...has anyone put an oil cooler on these? i want to put one on with an oil filter as well, as it doesnt have one and i have to change the oil every 8 hours. im also looking for a japanese rear shock to put on mine as the one on now is a bit too soft.

 

[Linkavitch...]

also i hadnt drowned it the water got in the gearbox breather snorkel ive put a longer hose with a small part of gauze on the end to keep out the big stuff. this bike didnt have an airbox but i put one off an old suzuki on and put the hose into the airbox. im now saving up for protapers better tyres and other things. im also saving up for an rmx250 it can be my open trail weapon and the tomahawk can be my tight trail beast

 

[rodbox5]

The 520 chain should be an interesting mod Link - you might post some pictures when it's done.

I've kept my engine well serviced and change the oil often - and to be honest haven't had the slightest problems with either the oil or engine overheating.

The only thing is to not leave them running for long periods whilst standing still - as the engine temp will rise under these condition - particularly on a hot day. Again - if you manage to find a suitable oil cooler and get it fitted - be sure to post pictures.

On another matter - has anyone bought spare disk rotors for their Hummer?

If so, let us know where from and how much.